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

Effect of urea supplementation on urea kinetics and splanchnic flux of amino acids in dairy cows

H. Lapierre 1  ,  
D. R. Ouellet 1,  
R. Berthiaume 1,  
C. Girard 1,  
P. Dubreuil 2,  
M. Babkine 2,  
 
1
Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
2
Université de Montréal, St-Hyacinthe, Québec, Canada
3
Rowett Research Institute, Aberdeen, Scotland, UK
J. Anim. Feed Sci. 2004;13(Suppl. 1):319–322
Publish date: 2004-08-30
KEYWORDS:
ABSTRACT:
Five lactating dairy cows were used in a cross-over design to determine if increased hepatic ureagenesis affected hepatic removal of amino acids (AA). Hepatic ureagenesis accounted for all urea entry rate (measured with a 3-d infusion of 15N15N-urea) and both increased with urea supplementation. Neither liver removal of essential AA or milk protein yield was affected by urea supplementation. Gut entry rate and its partition between anabolic and catabolic fates were also unaltered by treatment. Saliva contributed to 0.31 to 0.50 of urea gut entry rate. In cows producing 32 kg/d of milk and fed a diet supplying 157 g CP / kg DM, increased hepatic ureagenesis did not result in decreased post-liver supply of essential AA and subsequent milk protein yield.
CORRESPONDING AUTHOR:
H. Lapierre   
Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
 
CITATIONS (3):
1. Effect of method of conservation of timothy on endogenous nitrogen flows in lactating dairy cows
D.R. Ouellet, R. Berthiaume, G. Holtrop, G.E. Lobley, R. Martineau, H. Lapierre
Journal of Dairy Science
2. Ammonia and urea transport across the rumen epithelium: a review
Khalid Abdoun, Friederike Stumpff, Holger Martens
Animal Health Research Reviews
3. Effects of high ambient temperature on urea-nitrogen recycling in lactating dairy cows
Taketo OBITSU, Mitsuru KAMIYA, Yuko KAMIYA, Masahito TANAKA, Toshihisa SUGINO, Kohzo TANIGUCHI
Animal Science Journal
ISSN:1230-1388