SHORT COMMUNICATION
Effect of urea supplementation on urea kinetics and splanchnic flux of amino acids in dairy cows
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1
Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
 
2
Université de Montréal, St-Hyacinthe, Québec, Canada
 
3
Rowett Research Institute, Aberdeen, Scotland, UK
 
 
Publication date: 2004-08-30
 
 
Corresponding author
H. Lapierre   

Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
 
 
J. Anim. Feed Sci. 2004;13(Suppl. 1):319-322
 
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.
 
CITATIONS (8):
1.
Effect of method of conservation of timothy on endogenous nitrogen flows in lactating dairy cows
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Ammonia and urea transport across the rumen epithelium: a review
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3.
Effects of high ambient temperature on urea-nitrogen recycling in lactating dairy cows
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4.
The route of absorbed nitrogen into milk protein
H. Lapierre, R. Berthiaume, G. Raggio, M. C. Thivierge, L. Doepel, D. Pacheco, P. Dubreuil, G. E. Lobley
Animal Science
 
5.
Invited review: Nitrogen in ruminant nutrition: A review of measurement techniques
A.N. Hristov, A. Bannink, L.A. Crompton, P. Huhtanen, M. Kreuzer, M. McGee, P. Nozière, C.K. Reynolds, A.R. Bayat, D.R. Yáñez-Ruiz, J. Dijkstra, E. Kebreab, A. Schwarm, K.J. Shingfield, Z. Yu
Journal of Dairy Science
 
6.
Modeling portal-drained viscera and liver fluxes of essential amino acids in dairy cows
A.J. Fleming, H. Lapierre, R. Martineau, R.R. White, M.D. Hanigan
Journal of Dairy Science
 
7.
Effect of increasing dietary proportion of plantain on milk production and nitrogen use of grazing dairy cows in late lactation
Daniel Nkomboni, Racheal Bryant, Grant Edwards
Animal Production Science
 
8.
Balancing dairy cattle diets for rumen nitrogen and methionine or all essential amino acids relative to metabolizable energy
R.J. Higgs, L.E. Chase, C.G. Schwab, B. Sloan, D. Luchini, P.A. LaPierre, Amburgh Van
Journal of Dairy Science
 
ISSN:1230-1388
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