0.906
IF5
0.875
IF
Q3
JCR
1.0
CiteScore
0.374
SJR
Q2
SJR
20
MNiSW
165.24
ICV
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Articles by J. Kowalczyk
 
ORIGINAL PAPER

Incorporation of endogenous urea nitrogen into amino acids of milk in goats fed diets with various protein levels
J. P. Michalski, M. Czauderna, W. Litwin, N. Puzio, J. Kowalczyk
J. Anim. Feed Sci. 2014;23(3):212–216
DOI: https://doi.org/10.22358/jafs/65681/2014
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ORIGINAL PAPER

Incorporation of endogenous urea nitrogen into the amino acids of bacterial protein in the rumen of goats fed diets with various protein levels
J. P. Michalski, J. Kowalczyk, M. Czauderna, W. Litwin
J. Anim. Feed Sci. 2013;22(4):311–315
DOI: https://doi.org/10.22358/jafs/65918/2013
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ORIGINAL PAPER

Dietary lycopenes, selenium compounds and fish oil affect the profile of fatty acids and oxidative stress in chicken breast muscle
A. J. Rozbicka-Wieczorek, E. Szarpak, F. Brzóska, B. Śliwiński, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2012;21(4):705–724
DOI: https://doi.org/10.22358/jafs/66143/2012
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ORIGINAL PAPER

Efficiency of endogenous urea 15N nitrogen incorporation into bacterial and milk protein of goats fed diets with three different protein levels
J. P. Michalski, J. Kowalczyk, J. Voigt, H. M. Hammon, M. Czauderna, C. C. Metges
J. Anim. Feed Sci. 2012;21(4):599–612
DOI: https://doi.org/10.22358/jafs/66134/2012
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ORIGINAL PAPER

Selenite and selenate affected the fatty acid profile in in vitro incubated ovine ruminal fluid containing linoleic acid
M. Czauderna, J. Kowalczyk, R. J. Wallace
J. Anim. Feed Sci. 2012;21(3):477–492
DOI: https://doi.org/10.22358/jafs/66121/2012
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ORIGINAL PAPER

Dietary linseed oil and selenate affect the concentration of fatty acids and selenium in the spleen, pancreas, and kidneys of lambs
K. A. Krajewska, A. J. Rozbicka-Wieczorek, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2012;21(2):285–301
DOI: https://doi.org/10.22358/jafs/66077/2012
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ORIGINAL PAPER

The effectiveness of rapeseed cake and glycerine in feeding dairy cows
M. Zymon, J. Strzetelski, I. Furgał-Dierżuk, J. Kowalczyk, S. Osięgłowski
J. Anim. Feed Sci. 2012;21(1):49–64
DOI: https://doi.org/10.22358/jafs/66035/2012
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ORIGINAL PAPER

Dietary conjugated linoleic acid isomers and selenite or selenized yeast affect fatty acid concentration in the kidneys of rats
M. Czauderna, J. Kowalczyk, K. A. Krajewska, A. J. Rozbicka-Wieczorek
J. Anim. Feed Sci. 2011;20(3):432–448
DOI: https://doi.org/10.22358/jafs/66198/2011
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ORIGINAL PAPER

Selenite, selenized yeast, or conjugated linoleic acid isomers supplemented to the diet influence the fatty acid profile in the spleen and blood plasma of rats
M. Czauderna, J. Kowalczyk, K. A. Krajewska, L'. Leng
J. Anim. Feed Sci. 2010;19(4):613–627
DOI: https://doi.org/10.22358/jafs/66335/2010
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ORIGINAL PAPER

The effect of conjugated linoleic acid isomers, selenite and selenized yeast supplemented to the diet on the fatty acid profile in the pancreas of rats
M. Czauderna, J. Kowalczyk, K. A. Krajewska
J. Anim. Feed Sci. 2010;19(3):495–508
DOI: https://doi.org/10.22358/jafs/66314/2010
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ORIGINAL PAPER

Effect of feeding ensiled maize grain on rumen development and calf rearing performance
E. Sosin-Bzducha, J. Strzetelski, F. Borowiec, J. Kowalczyk, K. Okoń
J. Anim. Feed Sci. 2010;19(2):195–210
DOI: https://doi.org/10.22358/jafs/66281/2010
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ORIGINAL PAPER

Effect of a protein level in the diet on fatty acid profile in goat milk
M. Czauderna, J. Kowalczyk, J. P. Michalski
J. Anim. Feed Sci. 2010;19(2):211–217
DOI: https://doi.org/10.22358/jafs/66282/2010
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ORIGINAL PAPER

The dietary level of selenite and selenized yeast influences the concentrations of selected fatty acids in the abdominal fat and brain of rats
M. Czauderna, J. Kowalczyk, K. A. Krajewska, J. P. Michalski
J. Anim. Feed Sci. 2010;19(1):113–129
DOI: https://doi.org/10.22358/jafs/66275/2010
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ORIGINAL PAPER

Dietary selenite and conjugated linoleic acid isomers influence fatty acid concentrations in the liver and femoral muscles of rats
M. Czauderna, J. Kowalczyk, K. A. Krajewska, A. J. Rozbicka, J. P. Michalski
J. Anim. Feed Sci. 2009;18(3):564–581
DOI: https://doi.org/10.22358/jafs/66432/2009
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ORIGINAL PAPER

Dietary selenized yeast and CLA isomer mixture affect fatty- and amino acid concentrations in the femoral muscles and liver of rats
M. Czauderna, J. Kowalczyk, K. M. Niedźwiedzka, L. Leng, K. Cobanova
J. Anim. Feed Sci. 2009;18(2):348–361
DOI: https://doi.org/10.22358/jafs/66399/2009
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ORIGINAL PAPER

Protected methionine as a methyl-group donor for dairy cows fed diets with different starch sources in the transition period
J. A. Strzetelski, Z. M. Kowalski, J. Kowalczyk, F. Borowiec, S. Osięgłowski, K. Ślusarczyk
J. Anim. Feed Sci. 2009;18(1):28–41
DOI: https://doi.org/10.22358/jafs/66364/2009
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ORIGINAL PAPER

Effect of pre- and post-calving concentrate allocation and of starch source on feed intake, blood metabolite profiles and performance of transition cows
J. A. Strzetelski, S. Osięgłowski, Z. M. Kowalski, J. Kowalczyk, F. Borowiec, E. Sosin
J. Anim. Feed Sci. 2008;17(4):473–490
DOI: https://doi.org/10.22358/jafs/66641/2008
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ORIGINAL PAPER

Influence of selenate and linseed oil on fatty-acid and amino-acid profiles in the liver, muscles, fat tissues and blood plasma of sheep
K. M. Niedźwiedzka, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2008;17(3):328–343
DOI: https://doi.org/10.22358/jafs/66612/2008
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ORIGINAL PAPER

Lactic acid can be easily and precisely determined by reversed-phase high performance liquid chromatography with pre-column derivatization
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2008;17(2):268–279
DOI: https://doi.org/10.22358/jafs/66606/2008
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ORIGINAL PAPER

Comparison of the influence of different chemical forms of selenium and the profiles of CLA isomers in the diet on the fatty acid and amino acid contents in the liver and femoral muscles of rats
M. Czauderna, J. Kowalczyk, K. Korniluk, K. M. Niedźwiedzka
J. Anim. Feed Sci. 2007;16(4):678–695
DOI: https://doi.org/10.22358/jafs/66825/2007
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SHORT COMMUNICATION

Effects of dietary fat source on physical, chemical and sensorial quality of calves’ meat
M. Zymon, J. Strzetelski, J. Kowalczyk
J. Anim. Feed Sci. 2007;16(Suppl. 2):554–559
DOI: https://doi.org/10.22358/jafs/74606/2007
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SHORT COMMUNICATION

Response of milk fatty acid profile to various protein levels in goat diets with similar fatty acid content
M. Czauderna, J. Kowalczyk, T. Żebrowska, J. P. Michalski, I. Wąsowska
J. Anim. Feed Sci. 2007;16(Suppl. 2):548–553
DOI: https://doi.org/10.22358/jafs/74605/2007
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ORIGINAL PAPER

Influence of dietary CLA isomers and selenium compounds on the fatty acid and amino acid profiles in blood plasma of rats
K. M. Niedźwiedzka, K. Korniluk, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2007;16(2):257–273
DOI: https://doi.org/10.22358/jafs/66747/2007
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ORIGINAL PAPER

The influence of dietary conjugated linoleic acid isomers and selenized yeast on the fatty acid profile of the spleen, pancreas and kidneys of rats
K. Korniluk, M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2007;16(1):121–139
DOI: https://doi.org/10.22358/jafs/66733/2007
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ORIGINAL PAPER

The use of developed chromatographic techniques to determine vitamin E and conjugated linoleic acid isomers in milk of cows
M. Czauderna, J. Kowalczyk, S. K. Jensen, K. Sejrsen, M. T. Sørensen
J. Anim. Feed Sci. 2007;16(Suppl. 1):90–96
DOI: https://doi.org/10.22358/jafs/74120/2007
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ORIGINAL PAPER

The effects of linseed and rape seed cultivars and fish oil on the fatty acid profile of cow milk fat
M. Zymon, J. Strzetelski, J. Kowalczyk, S. Osięgłowski
J. Anim. Feed Sci. 2007;16(Suppl. 1):70–74
DOI: https://doi.org/10.22358/jafs/74115/2007
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SHORT COMMUNICATION

The effect of a high forage diet and different oil blends on rumen fermentation in vitro
D. Jalč, A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak
J. Anim. Feed Sci. 2006;15(Suppl. 1):141–144
DOI: https://doi.org/10.22358/jafs/70429/2006
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SHORT COMMUNICATION

The effect of a forage diet and different fat sources on rumen fermentation in vitro
D. Jalč, A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak
J. Anim. Feed Sci. 2006;15(Suppl. 1):129–132
DOI: https://doi.org/10.22358/jafs/70158/2006
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SHORT COMMUNICATION

The influence of selenium on the level of linoleic acid isomers in incubated ruminal fluid
I. Wąsowska, M. Czauderna, J. Kowalczyk, R. J. Wallace
J. Anim. Feed Sci. 2006;15(Suppl. 1):97–100
DOI: https://doi.org/10.22358/jafs/70152/2006
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SHORT COMMUNICATION

The influence of dietary conjugated linoleic acid isomers on the essential amino acid profile in rats
K. M. Niedźwiedzka, M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2006;15(Suppl. 1):69–72
DOI: https://doi.org/10.22358/jafs/70145/2006
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SHORT COMMUNICATION

The concentration of conjugated linoleic acid isomers and their metabolites in the abdominal fat of rats
K. Korniluk, M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2006;15(Suppl. 1):61–64
DOI: https://doi.org/10.22358/jafs/70143/2006
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ORIGINAL PAPER

The influence of dietary conjugated linoleic acid isomers and Se on the fatty acid profile in rat blood plasma and selected tissues
K. M. Niedźwiedzka, I. Wąsowska, M. Czauderna, J. Kowalczyk, B. Pastuszewska
J. Anim. Feed Sci. 2006;15(3):471–489
DOI: https://doi.org/10.22358/jafs/66918/2006
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SHORT COMMUNICATION

The effect of different oils and diets on methane release in an artificial rumen (Rusitec)
D. Jalč, A. Cieślak, M. Szumacher-Strabel, A. Potkański, J. Kowalczyk
J. Anim. Feed Sci. 2006;15(Suppl. 1):149–152
DOI: https://doi.org/10.22358/jafs/70166/2006
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SHORT COMMUNICATION

The effect of different oils and diets on total gas production in an artificial rumen (Rusitec)
D. Jalč, A. Cieślak, M. Szumacher-Strabel, A. Potkański, J. Kowalczyk
J. Anim. Feed Sci. 2006;15(Suppl. 1):145–148
DOI: https://doi.org/10.22358/jafs/70165/2006
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SHORT COMMUNICATION

The effect of a high concentrate diet and different fat sources on rumen fermentation in vitro
D. Jalč, A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak
J. Anim. Feed Sci. 2006;15(Suppl. 1):137–140
DOI: https://doi.org/10.22358/jafs/70162/2006
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SHORT COMMUNICATION

The effect of a high forage diet and different fat sources on rumen fermentation in vitro
D. Jalč, A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak
J. Anim. Feed Sci. 2006;15(Suppl. 1):133–136
DOI: https://doi.org/10.22358/jafs/70161/2006
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ORIGINAL PAPER

Dynamics of microbial contamination of protein during ruminal in situ incubation of feedstuffs
K. Krawielitzki, Th. Schmidt, J. Voigt, J. Kowalczyk, M. Gabel
J. Anim. Feed Sci. 2006;15(2):313–328
DOI: https://doi.org/10.22358/jafs/66903/2006
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ORIGINAL PAPER

Influence of dietary conjugated linoleic acid isomers and selenium on growth, feed efficiency, and liver fatty acid profile in rats
K. Korniluk, M. Czauderna, J. Kowalczyk, A. Mieczkowska, M. Taciak, L'. Leng
J. Anim. Feed Sci. 2006;15(1):131–146
DOI: https://doi.org/10.22358/jafs/66874/2006
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SHORT COMMUNICATION

Improving the analysis of fatty acids using a combination of gas chromatography and Ag+ liquid chromatography
M. Czauderna, J. Kowalczyk, K. Korniluk, I. Wąsowska
J. Anim. Feed Sci. 2005;14(Suppl. 1):563–566
DOI: https://doi.org/10.22358/jafs/70737/2005
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SHORT COMMUNICATION

Dietary conjugated linoleic acid isomers and selenium affect the fatty acid profile in rat liver
M. Czauderna, J. Kowalczyk, K. Korniluk, I. Wąsowska, B. Pastuszewska
J. Anim. Feed Sci. 2005;14(Suppl. 1):533–536
DOI: https://doi.org/10.22358/jafs/70727/2005
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SHORT COMMUNICATION

Effect of dietary CLA isomers on selenium, zinc, copper, chromium, magnesium and calcium levels in rat liver
M. Czauderna, J. Kowalczyk, E. Bulska, K. Boldižarova, K. M. Niedźwiedzka, A. Ruszczyńska, Ľ. Leng
J. Anim. Feed Sci. 2005;14(Suppl. 1):529–532
DOI: https://doi.org/10.22358/jafs/70726/2005
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SHORT COMMUNICATION

Influence of dietary conjugated linoleic acid (CLA) on the fatty acid content and CLA profile of egg yolks in laying hens
M. Czauderna, J. Kowalczyk, P. M. Pisulewski, K. Korniluk
J. Anim. Feed Sci. 2005;14(Suppl. 1):435–438
DOI: https://doi.org/10.22358/jafs/70700/2005
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SHORT COMMUNICATION

The effect of fish oil in calf diets on the fatty-acid content of Musculus thoracis intramuscular fat
M. Zymon, J. A. Strzetelski, J. Kowalczyk
J. Anim. Feed Sci. 2005;14(Suppl. 1):319–322
DOI: https://doi.org/10.22358/jafs/70550/2005
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SHORT COMMUNICATION

The stability of silage containing biological and chemical additives assessed using a Rusitec system
A. Potkański, A. Cieślak, M. Szumacher-Strabel, S. Wylegała, K. Raczkowska-Werwińska, A. Gubała, J. Kowalczyk
J. Anim. Feed Sci. 2005;14(Suppl. 1):307–310
DOI: https://doi.org/10.22358/jafs/70547/2005
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SHORT COMMUNICATION

Excretion routes and distribution of selenium in sheep tissues after selenite loading
V. Petrović, K. Boldižárová, Š. Faix, J. Kowalczyk, M. Czauderna, M. Mellen, L’. Leng
J. Anim. Feed Sci. 2005;14(Suppl. 1):303–306
DOI: https://doi.org/10.22358/jafs/70546/2005
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SHORT COMMUNICATION

Concentrate-enriched diets for calving heifers in the periparturient period increase milk yield and improve blood metabolite profile
A. Jurkiewicz, J. A. Strzetelski, J. Kowalczyk, K. Bilik
J. Anim. Feed Sci. 2005;14(Suppl. 1):259–262
DOI: https://doi.org/10.22358/jafs/70533/2005
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SHORT COMMUNICATION

Short-term vasopressin analogue treatment does not influence the nitrogen balance in sheep
Š. Faix, Ľ. Leng, J. J. Pająk, K. Boldižárová, Z. Faixová, M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2005;14(Suppl. 1):251–254
DOI: https://doi.org/10.22358/jafs/70526/2005
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SHORT COMMUNICATION

Methane production in in vitro studies as an effect of different additives to grass-clover silage
A. Cieślak, A. Potkański, J. Kowalczyk, M. Szumacher-Strabel, K. Czaczyk, A. Gubała, M. Janicki, E. Szymankiewicz
J. Anim. Feed Sci. 2005;14(Suppl. 1):235–238
DOI: https://doi.org/10.22358/jafs/70521/2005
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ORIGINAL PAPER

The effect of linseed oil and selenium on the content of fatty acids and some elements in the liver and selected tissues of sheep
M. Czauderna, J. Kowalczyk, K. M. Niedźwiedzka, I. Wąsowska, J. J. Pająk, E. Bulska, A. Ruszczyńska
J. Anim. Feed Sci. 2004;13(Suppl. 2):105–108
DOI: https://doi.org/10.22358/jafs/70316/2004
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SHORT COMMUNICATION

A highly efficient method for determination of allantoin in ruminal digesta, ovine urine and blood serum by HPLC
M. Czauderna, J. Kowalczyk, J. Skomiał, K. M. Niedźwiedzka
J. Anim. Feed Sci. 2004;13(Suppl. 2):67–70
DOI: https://doi.org/10.22358/jafs/70300/2004
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SHORT COMMUNICATION

Blood parameters of lambs fed diets with vegetable oil supplements
A. Cieślak, A. Potkański, M. Szumacher-Strabel, J. Kowalczyk
J. Anim. Feed Sci. 2004;13(Suppl. 2):23–26
DOI: https://doi.org/10.22358/jafs/70285/2004
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SHORT COMMUNICATION

Effect of adding fat to the diet for lambs on the fatty acid profile of intramuscular, perirenal and subcutaneous fat
M. Szumacher-Strabel, A. Potkański, A. Cieślak, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2004;13(Suppl. 1):355–358
DOI: https://doi.org/10.22358/jafs/73936/2004
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SHORT COMMUNICATION

Changes in fermentation processes as the effect of vegetable oil supplementation in in vitro studies
M. Szumacher-Strabel, S. A. Martin, A. Potkański, A. Cieślak, J. Kowalczyk
J. Anim. Feed Sci. 2004;13(Suppl. 1):215–218
DOI: https://doi.org/10.22358/jafs/73843/2004
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SHORT COMMUNICATION

Digestion of starch and crude fibre in segments of the digestive tract of sheep fed different types and amounts of starch
B. Kowalik, J. Kowalczyk, J. J. Pająk, T. Żebrowska
J. Anim. Feed Sci. 2004;13(Suppl. 1):123–126
DOI: https://doi.org/10.22358/jafs/73756/2004
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SHORT COMMUNICATION

Simultaneous determination of purine metabolites in ovine urine and blood plasma by high-performance liquid chromatography
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2004;13(Suppl. 1):55–58
DOI: https://doi.org/10.22358/jafs/73737/2004
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ORIGINAL PAPER

Liver and body mass gain, content of conjugated linoleic acid (CLA) isomers and other fatty acids in the liver of rats fed CLA isomers and selenium
M. Czauderna, J. Kowalczyk, K. M. Niedźwiedzka, I. Wąsowska, B. Pastuszewska, E. Bulska, A. Ruszczyńska
J. Anim. Feed Sci. 2004;13(2):353–369
DOI: https://doi.org/10.22358/jafs/67419/2004
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ORIGINAL PAPER

Conjugated linoleic acid (CLA) content and fatty acids composition of muscle in rats fed isomers of CLA and selenium
M. Czauderna, J. Kowalczyk, K. M. Niedźwiedzka, I. Wąsowska, B. Pastuszewska
J. Anim. Feed Sci. 2004;13(1):183–196
DOI: https://doi.org/10.22358/jafs/67402/2004
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ORIGINAL PAPER

The effects of selenium and conjugated linoleic acid (CLA) isomers on fatty acid composition, CLA isomer content in tissues, and growth of rats
M. Czauderna, J. Kowalczyk, I. Wąsowska, K. M. Niedźwiedzka, B. Pastuszewska
J. Anim. Feed Sci. 2003;12(4):865–881
DOI: https://doi.org/10.22358/jafs/67781/2003
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ORIGINAL PAPER

The urinary excretion of purine derivatives in sheep is not influenced by long term treatment with vasopressin
Š. Faix, Ľ. Leng, J. J. Pająk, M. Czauderna, Z. Faixová, K. Boldižárová, J. Kowalczyk
J. Anim. Feed Sci. 2003;12(3):513–520
DOI: https://doi.org/10.22358/jafs/67727/2003
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ORIGINAL PAPER

Efficiency of metabolizable and net energy in growing bulls fed diets with maize silage
S. Osięgłowski, J. A. Strzetelski, J. Kowalczyk, B. Niwińska
J. Anim. Feed Sci. 2003;12(3):475–486
DOI: https://doi.org/10.22358/jafs/67724/2003
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ORIGINAL PAPER

Development of a method for measuring lysine and methionine bioavailability in rumen-protected products for cattle
H. Rulquin, J. Kowalczyk
J. Anim. Feed Sci. 2003;12(3):465–474
DOI: https://doi.org/10.22358/jafs/67723/2003
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ORIGINAL PAPER

Determination of conjugated linoleic acid isomers by liquid chromatography and photodiode array detection
M. Czauderna, J. Kowalczyk, I. Wąsowska, K. M. Niedźwiedzka
J. Anim. Feed Sci. 2003;12(2):369–382
DOI: https://doi.org/10.22358/jafs/67717/2003
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ORIGINAL PAPER

Fatty acid flow to the duodenum of sheep fed diets supplemented with different types of fat
M. Szumacher-Strabel, A. Potkański, J. Kowalczyk, A. Cieślak, M. Czauderna, G. Strzelecka, P. Jędroszkowiak
J. Anim. Feed Sci. 2003;12(2):239–248
DOI: https://doi.org/10.22358/jafs/67700/2003
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ORIGINAL PAPER

A highly efficient method for determination of some amino acids and glutathione by liquid chromatography
M. Czauderna, J. Kowalczyk, K. M. Niedźwiedzka, I. Wąsowska
J. Anim. Feed Sci. 2003;12(1):199–215
DOI: https://doi.org/10.22358/jafs/67697/2003
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ORIGINAL PAPER

A note on the influence of fat supplementation of sheep rations on the level of purine derivatives in urine and bacterial synthesis in the rumen
A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak
J. Anim. Feed Sci. 2003;12(1):65–70
DOI: https://doi.org/10.22358/jafs/67660/2003
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ORIGINAL PAPER

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 4. Whole body protein metabolism
A. Sandek, K. Krawielitzki, J. Kowalczyk, M. Gabel, T. Żebrowska, F. Kreienbring, H. Hagemeister, J. Voigt
J. Anim. Feed Sci. 2002;11(4):589–599
DOI: https://doi.org/10.22358/jafs/67913/2002
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ORIGINAL PAPER

The influence of supplemental fat on rumen volatile fatty acid profle, ammonia and pH levels in sheep fed a standard diet
M. Szumacher-Strabel, A. Potkański, J. Kowalczyk, A. Cieślak, M. Czauderna, A. Gubała, P. Jędroszkowiak
J. Anim. Feed Sci. 2002;11(4):577–587
DOI: https://doi.org/10.22358/jafs/67912/2002
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ORIGINAL PAPER

A highly efficient method for derivatization of fatty acids for high performance liquid chromatography
M. Czauderna, J. Kowalczyk, K. M Niedźwiedzka, I. Wąsowska
J. Anim. Feed Sci. 2002;11(3):517–526
DOI: https://doi.org/10.22358/jafs/67905/2002
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ORIGINAL PAPER

Milk yield, composition and cholesterol level in dairy cows fed rations supplemented with zinc and fatty acid calcium salts
F. Brzóska, J. Kowalczyk
J. Anim. Feed Sci. 2002;11(3):411–424
DOI: https://doi.org/10.22358/jafs/67831/2002
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ORIGINAL PAPER

A HPLC method with UV detection for analysing of 2,6-diaminopimelic acid in rumen bacteria and intestinal digesta
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 2002;11(2):331–346
DOI: https://doi.org/10.22358/jafs/67817/2002
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ORIGINAL PAPER

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 3. N secretion and reabsorption
A. Sandek, K. Krawielitzki, J. Kowalczyk, F. Kreienbring, M. Gabel, U. Schönhusen, T. Żebrowska, H. Hagemeister, J. Voigt
J. Anim. Feed Sci. 2002;11(2):277–288
DOI: https://doi.org/10.22358/jafs/67812/2002
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ORIGINAL PAPER

Determination of free- and protein primary amino acids in biological materials by high-performance liquid chromatography and photodiode array detection
M. Czuderna, J. Kowalczyk, K. M. Niedźwiedzka, I. Wąsowska
J. Anim. Feed Sci. 2002;11(1):143–167
DOI: https://doi.org/10.22358/jafs/67798/2002
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ORIGINAL PAPER

A note on the effect of different amounts and types of fat on the fatty acid composition of duodenal digesta in sheep
A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak, M. Czauderna
J. Anim. Feed Sci. 2001;10(4):627–632
DOI: https://doi.org/10.22358/jafs/68014/2001
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ORIGINAL PAPER

The influence of dietary protein and fibre on bile-pancreatic secretion in sheep
T. Żebrowska, J. Kowalczyk, J. J. Pająk, Z. Długołęcka
J. Anim. Feed Sci. 2001;10(4):619–626
DOI: https://doi.org/10.22358/jafs/68013/2001
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ORIGINAL PAPER

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 2. Passage of endogenous nitrogen
A. Sandek, K. Krawielitzki, J. Kowalczyk, F. Kreienbring, U. Schönhusen, M. Gabel, T. Żebrowska, H. Hangemeister, J. Voigt
J. Anim. Feed Sci. 2001;10(4):605–618
DOI: https://doi.org/10.22358/jafs/68012/2001
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ORIGINAL PAPER

Milk yield and composition in cows fed rations with different energy and protein sources
J. Strzetelski, K. Krawczyk, J. Kowalczyk, S. Osięgłowski, H. Pustkowiak
J. Anim. Feed Sci. 2001;10(4):569–588
DOI: https://doi.org/10.22358/jafs/68010/2001
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ORIGINAL PAPER

Studies on N-metabolism in different gastrointestinal sections of sheep using the digesta exchange technique. 1. Model and experimental conditions
A. Sandek, K. Krawielitzki, J. Kowalczyk, F. Kreienbring, M. Gabel, T. Żebrowska, J. Voigt
J. Anim. Feed Sci. 2001;10(3):421–434
DOI: https://doi.org/10.22358/jafs/67996/2001
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ORIGINAL PAPER

Effect of milk replacer feeding frequency and level on concentrate intake and rearing performance of calves
J. Strzetelski, B. Niwińska, J. Kowalczyk, A. Jurkiewicz
J. Anim. Feed Sci. 2001;10(3):413–420
DOI: https://doi.org/10.22358/jafs/67995/2001
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SHORT COMMUNICATION

Quantification of conjugated linoleic acid and other essential fatty acids in ovine meat, milk, fat, and intestinal digesta
M. Czauderna, J. Kowalczyk, A. Potkański, M. Szumacher-Strabel, G. Chojecki
J. Anim. Feed Sci. 2001;10(Suppl. 2):385–392
DOI: https://doi.org/10.22358/jafs/70125/2001
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An HPLC method for determining desirable or undesirable conjugated linoleic acid
M. Czauderna, J. Kowalczyk, A. Potkański, M. Szumacher-Strabel, G. Chojecki
J. Anim. Feed Sci. 2001;10(Suppl. 2):377–383
DOI: https://doi.org/10.22358/jafs/70124/2001
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SHORT COMMUNICATION

An improved method for derivatization of fatty acids for liquid chromatography
M. Czauderna, J. Kowalczyk, G. Chojecki
J. Anim. Feed Sci. 2001;10(Suppl. 2):369–375
DOI: https://doi.org/10.22358/jafs/70123/2001
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SHORT COMMUNICATION

Effect of extrusion-cooking temperature on the nutritive value of lupin seeds in fattening lambs
J. J. Pająk, J. Kowalczyk, T. Żebrowska, B. Kowalik, Z. Długołęcka
J. Anim. Feed Sci. 2001;10(Suppl. 2):357–362
DOI: https://doi.org/10.22358/jafs/70121/2001
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The effects of different amounts and types of fat on the extent of C18 unsaturated fatty acid hydrogenation in the rumen of sheep
A. Cieślak, M. Szumacher-Strabel, A. Potkański, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2001;10(Suppl. 2):123–128
DOI: https://doi.org/10.22358/jafs/70045/2001
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SHORT COMMUNICATION

The effects of different amounts and types of fat on milk fatty acid composition in sheep
A. Potkański, M. Szumacher-Strabel, J. Kowalczyk, A. Cieślak, M. Czauderna
J. Anim. Feed Sci. 2001;10(Suppl. 2):115–121
DOI: https://doi.org/10.22358/jafs/70043/2001
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SHORT COMMUNICATION

The effects of different amounts and types of fat on meat fatty acid composition in sheep
A. Potkański, M. Szumacher-Strabel, A. Cieślak, J. Kowalczyk, M. Urbaniak, M. Czauderna
J. Anim. Feed Sci. 2001;10(Suppl. 2):109–113
DOI: https://doi.org/10.22358/jafs/70042/2001
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SHORT COMMUNICATION

The effects of different amounts and types of fat on the level of conjugated linoleic acid in the meat and milk of sheep
M. Szumacher-Strabel, A. Potkański, A. Cieślak, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2001;10(Suppl. 2):103–108
DOI: https://doi.org/10.22358/jafs/70041/2001
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SHORT COMMUNICATION

The effects of different amounts and types of fat on rumen microbial protein synthesis in sheep
M. Szumacher-Strabel, A. Cieślak, A. Potkański, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2001;10(Suppl. 2):97–101
DOI: https://doi.org/10.22358/jafs/70040/2001
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SHORT COMMUNICATION

The effects of different amounts and types of fat on metabolites in the rumen of sheep
M. Szumacher-Strabel, A. Potkański, A. Cieślak, J. Kowalczyk, M. Czauderna
J. Anim. Feed Sci. 2001;10(Suppl. 2):91–96
DOI: https://doi.org/10.22358/jafs/70039/2001
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Effect of milk thistle (Sylibum marianum L.) endosperm in the diet for cows on milk yield and fatty acid profiles
A. Potkański, J. Kowalczyk, W. Nowak, M. Czauderna, S. Michalak
J. Anim. Feed Sci. 2001;10(Suppl. 2):83–89
DOI: https://doi.org/10.22358/jafs/70038/2001
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SHORT COMMUNICATION

The influence of dietary starch level and type on the activity of pancreatic digestive enzymes in sheep
B. Kowalik, J. Kowalczyk, J. J. Pająk, T. Żebrowska, Z. Długołęcka
J. Anim. Feed Sci. 2001;10(Suppl. 2):57–63
DOI: https://doi.org/10.22358/jafs/70034/2001
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ORIGINAL PAPER

A note on the effect of energy sources on duodenal flow of fatty acids and bacterial nitrogen in sheep
A. Potkański, J. Kowalczyk, M. Szumacher-Strabel, A. Cieślak, M. Czauderna
J. Anim. Feed Sci. 2001;10(2):293–300
DOI: https://doi.org/10.22358/jafs/67984/2001
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ORIGINAL PAPER

Fattening bulls on maize silage and concentrate supplemented with vegetable oils
J. Strzetelski, J. Kowalczyk, S. Osięgłowski, T. Stasiniewicz, E. Lipiarska, H. Pustkowiak
J. Anim. Feed Sci. 2001;10(2):259–271
DOI: https://doi.org/10.22358/jafs/67982/2001
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Performance and meat quality of fattening bulls fed complete feed with rapeseed oil cake or linseed
T. Stasiniewicz, J. Strzetelski, J. Kowalczyk, S. Osięgłowski, H. Pustkowiak
J. Anim. Feed Sci. 2000;9(2):283–296
DOI: https://doi.org/10.22358/jafs/68046/2000
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Effect of diets with hydrolysed feather keratin meal on milk yield and composition in dairy cow and calf performance
J. A. Strzetelski, J. Kowalczyk, K. Krawczyk, S. Osięgłowski, T. Stasiniewicz, E. Lipiarska
J. Anim. Feed Sci. 1999;8(4):497–512
DOI: https://doi.org/10.22358/jafs/69126/1999
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Nutritive value of feather keratin meals for ruminants
J. A. Strzetelski, J. Kowalczyk, B. Niwińska, K. Bilik, K. Maciaszek
J. Anim. Feed Sci. 1999;8(3):387–393
DOI: https://doi.org/10.22358/jafs/68998/1999
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Determination of 2,6-diaminopimelic acid in bacteria, ruminal and duodenal digesta using HPLC with fluorescence or UV detection
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 1999;8(2):273–288
DOI: https://doi.org/10.22358/jafs/68936/1999
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Nitrogen secretion and absorption in different segments of the digestive tract estimated by digesta exchange between 15N-labelled and unlabelled sheep
K. Krawielitzki, A. Sandek, J. Kowalczyk, F. Kreienbring, T. Żebrowska, B. Skiba, J. Voigt, M. Gabel, H. Hagemeister
J. Anim. Feed Sci. 1999;8(2):129–143
DOI: https://doi.org/10.22358/jafs/68831/1999
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Milk yield and composition in dairy cows fed a diet with evening primrose (Oenothera paradoxa) full fat seeds or oil cake
J. A. Strzetelski, J. Kowalczyk, T. Stasiniewicz, E. Lipiarska, S. Osięgłowski, K. Bilik
J. Anim. Feed Sci. 1999;8(1):89–94
DOI: https://doi.org/10.22358/jafs/68811/1999
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ORIGINAL PAPER

Determination of free amino acids in blood plasma by high-performance liquid chromatography with fluorescence detection
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 1998;7(4):453–463
DOI: https://doi.org/10.22358/jafs/69319/1998
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ORIGINAL PAPER

A note on rearing calves on diets supplemented with evening primrose (Oenothera paradoxa) oil cake
J. A. Strzetelski, J. Kowalczyk, B. Niwińska, K. Krawczyk, K. Maciaszek
J. Anim. Feed Sci. 1998;7(4):377–383
DOI: https://doi.org/10.22358/jafs/69312/1998
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Evening primrose (Oenothera paradoxa) oil cake or ground rape seed supplement to diets for dairy cow
J. A. Strzetelski, J. Kowalczyk, K. Krawczyk, T. Stasiniewicz, E. Lipiarska
J. Anim. Feed Sci. 1998;7(4):365–375
DOI: https://doi.org/10.22358/jafs/69311/1998
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Effect of various probiotics on calf performance
J. A. Strzetelski, J. Kowalczyk, K. Krawczyk
J. Anim. Feed Sci. 1998;7(Suppl. 1):241–244
DOI: https://doi.org/10.22358/jafs/69983/1998
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Nitrogen conversion and apparent intestinal amino acid absorption in young bulls fed isonitrogenous diets with different nitrogen sources
J. Kowalczyk, T. Żebrowska
J. Anim. Feed Sci. 1998;7(3):273–282
DOI: https://doi.org/10.22358/jafs/69302/1998
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ORIGINAL PAPER

Performance and body fat composition of fattening bulls fed diets with evening primrose (Oenothera paradoxa) oil cake
J. A. Strzetelski, K. Krawczyk, J. Kowalczyk, T. Stasiniewicz, S. Osięgłowski, E. Lipiarska
J. Anim. Feed Sci. 1998;7(3):261–271
DOI: https://doi.org/10.22358/jafs/69301/1998
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ORIGINAL PAPER

Nutritive value of evening primrose (Oenothera paradoxa) cake for ruminants
T. Stasiniewicz, B. Niwińska, J. A. Strzetelski, J. Kowalczyk, K. Maciaszek, K. Bilik
J. Anim. Feed Sci. 1998;7(2):187–195
DOI: https://doi.org/10.22358/jafs/69209/1998
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Simultaneous determination of purine derivatives in urine by high-performance liquid chromatography
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 1996;5(4):433–439
DOI: https://doi.org/10.22358/jafs/69622/1996
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ORIGINAL PAPER

A device for quantitative urine collection from male sheep in balance trials
J. Kowalczyk, B. Skiba, Z. Buczkowski, B. Kowalik
J. Anim. Feed Sci. 1996;5(3):297–301
DOI: https://doi.org/10.22358/jafs/69609/1996
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Nitrogen compounds and volatile fatty acids absorption from the caecum and colon of sheep
B. Skiba, J. Kowalczyk, T. Żebrowska
J. Anim. Feed Sci. 1996;5(1):25–34
DOI: https://doi.org/10.22358/jafs/69582/1996
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Yeast cells as a feed supplement for cattle 3. New yeast preparations for cows in the first period of lactation
J. A. Strzetelski, J. Kowalczyk, K. Bilik, T. Stasiniewicz, M. Soroka, B. Niwińska
J. Anim. Feed Sci. 1996;5(1):1–9
DOI: https://doi.org/10.22358/jafs/69580/1996
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Determination of allantoin in blood by high-performance liquid chromatography with pre-column derivatization
M. Czauderna, J. Kowalczyk
J. Anim. Feed Sci. 1995;4(4):351–358
DOI: https://doi.org/10.22358/jafs/69810/1995
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ORIGINAL PAPER

Secretion of nitrogen compounds into the isolated caecum and colon of sheep
B. Skiba, J. Kowalczyk, T. Żebrowska
J. Anim. Feed Sci. 1995;4(4):321–331
DOI: https://doi.org/10.22358/jafs/69806/1995
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Yeast cells as a feed supplement for cattle. 2. Effect of liquid yeast cultures on digestive processes in the rumen of bulls
J. A. Strzetelski, J. Maciejewicz-Ryś, R. Ryś, J. Kowalczyk, B. Niwińska, T. Stasiniewicz, K. Maciaszek
J. Anim. Feed Sci. 1995;4(4):287–297
DOI: https://doi.org/10.22358/jafs/69801/1995
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Intestinal nitrogen flow, total nitrogen and 15N balance in pigs labelled intravenously with 15N-leucine and fed a meat meal diet
R. Schadereit, K. Krawielitzki, T. Żebrowska, J. Kowalczyk, F. Kreienbring
J. Anim. Feed Sci. 1995;4(3):207–215
DOI: https://doi.org/10.22358/jafs/69794/1995
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Yeast cells as a feed supplement for cattle 1. Liquid viable yeast cultures for calves
J. A. Strzetelski, T. Ernest, J. Maciejewicz-Ryś, K. Maciaszek, J. Kowalczyk, E. Lipiarska
J. Anim. Feed Sci. 1995;4(3):171–181
DOI: https://doi.org/10.22358/jafs/69791/1995
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Treatment of barley straw with ammonia or urea solutions and digestibility of its structural carbohydrate fractions in sheep
J. Kowalczyk
J. Anim. Feed Sci. 1994;3(2):129–139
DOI: https://doi.org/10.22358/jafs/69827/1994
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ORIGINAL PAPER

The rate of free amino acid disappearance from the rumen content
J. Kowalczyk
J. Anim. Feed Sci. 1994;3(1):11–22
DOI: https://doi.org/10.22358/jafs/69814/1994
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ORIGINAL PAPER

Performance and wool growth in lambs fed rations containing formaldehyde treated protein
J. Kowalczyk, Z. Buczkowski, A. Jaczewska, U. Pawlus
J. Anim. Feed Sci. 1993;2(1-2):35–42
DOI: https://doi.org/10.22358/jafs/69862/1993
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ORIGINAL PAPER

Studies on absorption and secretion of 15N endogenous nitrogen along the digestive tract of pigs
T. Żebrowska, J. Kowalczyk, K. Krawielitzki, U. Hennig, R. Schadereit
J. Anim. Feed Sci. 1992;1(2):151–163
DOI: https://doi.org/10.22358/jafs/69905/1992
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The use of rape seeds in a complete feed in intensive fattening of young bulls
J. A. Strzetelski, E. Lipiarska, J. Kowalczyk, T. Stasiniewicz, K. Maciaszek
J. Anim. Feed Sci. 1992;1(2):107–116
DOI: https://doi.org/10.22358/jafs/69901/1992
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