SHORT COMMUNICATION
Effects of sun-curing, formic acid-treatment or
microbial inoculation of timothy on
urea metabolism in lactating dairy cows
1
Dairy and Swine R&D Centre, Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
2
Rowett Research Institute, Scotland, UK
3
Departement of Animal Science, Université Laval, Québec, Canada
Publication date: 2004-08-30
Corresponding author
D. R. Ouellet
Dairy and Swine R&D Centre, Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
Dairy and Swine R&D Centre, Agriculture and Agri-Food Canada, Lennoxville, Quebec, Canada
J. Anim. Feed Sci. 2004;13(Suppl. 1):323-326
KEYWORDS
ABSTRACT
Urea metabolism was estimated in dairy cows fed forage conserved as hay, formic acidtreated silage or microbial inoculated silage. Use of [15N15N]urea kinetics indicated that ureaN production was greatest (P<0.05) with inoculated silage. Gut entry rate of urea-N was not
affected by treatments. Urea-N recycled to ornithine cycle tended to be greater (P<0.08) when
cows received inoculated silage compared to when fed acid-treated silage. The proportion of
recycled urea-N lost in faeces was greater (P<0.05) when cows were fed forage conserved as hay
as opposed to when fed inoculated silage. Overall, urea metabolism was similar between cows
fed formic acid-treated silage or hay. Inoculated silage, however, increases urea production and
recycling to the ornithine cycle.
CITATIONS (3):
1.
Urea-N recycling in lactating dairy cows fed diets with 2 different levels of dietary crude protein and starch with or without monensin
E.B. Recktenwald, D.A. Ross, S.W. Fessenden, C.J. Wall, M.E. Van Amburgh
Journal of Dairy Science
E.B. Recktenwald, D.A. Ross, S.W. Fessenden, C.J. Wall, M.E. Van Amburgh
Journal of Dairy Science
2.
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
Taketo OBITSU, Mitsuru KAMIYA, Yuko KAMIYA, Masahito TANAKA, Toshihisa SUGINO, Kohzo TANIGUCHI
Animal Science Journal
3.
Effects of ensiling treatment for tuber crop forages and grain source on carbohydrate digestion, nitrogen utilization, and urea metabolism in sheep
H.L. Dang, T. Obitsu, T. Sugino
Animal Feed Science and Technology
H.L. Dang, T. Obitsu, T. Sugino
Animal Feed Science and Technology
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