0.857
IF5
0.900
IF
Q3
JCR
0.92
CiteScore
0.405
SJR
Q2
SJR
20
MNiSW
165.24
ICV
ORIGINAL PAPER
 
CC-BY 4.0
 
 

Phosphorus equivalency value of microbial phytase in weanling pigs fed a maize-soyabean meal based diet

 
1
Department of Animal and Poultry Sciences, Virginia Polytechnic Institute and State University, Blacksburg, VA 24061-0306, USA
J. Anim. Feed Sci. 1998;7(2):197–211
Publish date: 1998-03-25
KEYWORDS
ABSTRACT
Ninety-six crossbred pigs with an average initial weight of 10.3 kg were used in a 4-wk experiment to investigate the P equivalency value of microbial phytase in weanling pigs using performance, rib mineralization and faecal digestibility measurements. A 19% CP, maize-soyabean meal basal diet low in P (0.35%) and Ca (0.50%) was fed. Diets 1, 2, 3, and 4 contained 0, 167, 333, and 500 units (U) of added Natuphos® phytase per kg of diet, respectively. Diets 5, 6, and 7 contained no added phytase, and 0.40, 0.45, and 0.50% P, respectively. Body weight and pen feed consumption were measured weekly. During wk 4, pen faecal samples were collected twice daily for 5 d for determination of P, Ca and DM digestibilities. At the end of wk 4, the barrow from each pen (n = 48) was killed for collection of tenth ribs for determination of rib shear force, and ash content. Adding phytase to low P diets linearly increased (P < 0.02 to 0.001) ADG, rib shear force, rib ash weight and ash percent. Added P linearly increased (P < 0.02 to 0.001) ADG, rib shear force, rib ash weight, and ash percent, Ca and P digestibility and digestible Ca and P. Based on phytase and P linear or nonlinear response equations for ADG, P digestibility, rib ash weight and rib shear force, 500 U/kg of microbial phytase was equivalent to 1.03, 0.78, 0.89, and 0.69 g of inorganic P, respectively. The average equivalency of 500 U/kg of phytase was 0.84 g of P per kg of diet.
 
CITATIONS (4):
1. Meta-analysis of phosphorus utilization by growing pigs: effect of dietary phosphorus, calcium and exogenous phytase
M. P. Létourneau-Montminy, C. Jondreville, D. Sauvant, A. Narcy
animal
2. Estimating equivalency values of microbial phytase for amino acids in growing and finishing pigs fitted with steered ileo-cecal valve cannulas
J. S. Radcliffe, R. S. Pleasant, E. T. Kornegay
Journal of Animal Science
3. Animal management to reduce phosphorus losses to the environment1
K. F. Knowlton, J. S. Radcliffe, C. L. Novak, D. A. Emmerson
Journal of Animal Science
4. A critical review of methods used to determine phosphorus and digestible amino acid matrices when using phytase in poultry and pig diets
Yueming Dersjant-Li, Milan Hruby, Ceinwen Evans, Ralf Greiner
Journal of Applied Animal Nutrition
ISSN:1230-1388