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

Effect of processed cereal grains as a supplement on grass intake, rumen pool sizes, ruminal kinetics and the performance of grazing lactating dairy cows

R. Tóthi 1,  
R. H. Zhang 2,  
H. Boer 4,  
 
1
University of Kaposvár, Faculty of Animal Science, Department of Animal Nutrition, P.O. Box 16, H-7401 Kaposvár, Hungary
2
Inner Mongolia Agricultural University, 306 zhao wu da Rd. Huhhot, P.R. China
3
Facultad de Agronomia, EEMAC, Ruta 3 km 363, Paysandu, CP 60000, Uruguay
4
Wageningen Institute of Animal Science, Animal Nutrition Group, Marijkeweg 40, NL-6709 PG Wageningen, The Netherlands
J. Anim. Feed Sci. 2003;12(3):417–433
Publish date: 2003-07-15
KEYWORDS
ABSTRACT
Five multiparous lactating Holstein-Friesian dairy cows fitted with rumen cannula were allowed to graze perennial ryegrass swards. Next to a control treatment of grazing only, pelleted barley (PB), pelleted maize (PM), toasted and subsequently pelleted barley (TPB), and toasted and subsequently pelleted maize (TPM) were fed as a supplement in two equal portions. Before and after 3 h of grazing the rumen content was evacuated, weighed, sampled and returned to the animals. Then the cows were kept inside the barn and starved for 6 h, after which rumen evacuations were repeated. The estimated clearance rates of starch showed significant differences (P<0.001) between grain types and compared to unsupplemented animals the apparent ruminal clearance of nitrogen was significantly (P<0.001) reduced. Supplementation with processed grains significantly increased (P<0.05) the milk production and significantly (P<0.001) decreased milk fat percentage. It is concluded that supplementing grass with high-energy low protein feeds, such as grains, substantially improves the N utilization and reduces the urea output in milk.
ISSN:1230-1388