0.906
IF5
0.875
IF
Q3
JCR
0.92
CiteScore
0.405
SJR
Q2
SJR
20
MNiSW
165.24
ICV
SHORT COMMUNICATION
 
CC-BY 4.0
 
 

Effect of supplement strategy on splanchnic net fluxes of ammonia and urea in dairy cows fed fresh grass

B. A. Røjen 1,  
B. M. L. Raun 1,  
P. Lund 1,  
 
1
Department of Animal Nutrition and Physiology, Danish Institute of Agricultural Sciences, Box 50, DK-8830 Tjele, Denmark
J. Anim. Feed Sci. 2004;13(Suppl. 1):347–350
Publish date: 2004-08-30
KEYWORDS
ABSTRACT
Different strategies for supplementation of grass with rolled barley and soya hulls were investigated as tools for improving the nitrogen efficiency of dairy cows under restricted zero-grazing (47% grass DM) conditions. Three multicatheterized cows were subjected to 3 experimental treatments in a Latin square design. Treatments were: SAM, soya hulls fed am and barley fed pm; BAM, barley fed am and soya hulls fed pm; SBPM barley and soya hulls fed pm. The total daily ration was the same for all treatments. The arterial concentrations, net portal fluxes and net hepatic fluxes of ammonia, urea-N, oxygen and glucose were not affected by treatments. The cows had higher net portal flux of ammonia than transfer of urea-N to the gut although the diet had a low CP content (12.4%). Efficient recycling of nitrogen to the rumen combined with decreased nitrogen intake is in theory a promising strategy for improved nitrogen efficiency in ruminants. However, better understanding of factors affecting nitrogen recycling in ruminants is necessary for a successful utilization of this strategy.
CORRESPONDING AUTHOR
N. B. Kristensen   
Department of Animal Nutrition and Physiology, Danish Institute of Agricultural Sciences, Box 50, DK-8830 Tjele, Denmark
ISSN:1230-1388