Nitrogen balance and urinary nitrogen concentration in growing calves
1997
Sekine, J. (Tottori Univ. (Japan). Faculty of Agriculture) | Hai, J. | Oura, R.
Nitrogen (N) balance and urinary N concentration in growing calves were analyzed to study a possible strategy for reducing N excretion in ruminants. Mean N partitions were 1590 +- 103, 1051 +- 66, 529 +- 37, 466 +- 3 and 585 +- 64 mg/MBS for intake, fecal excretion, digested, urinary excretion and retention, respectively. Men urinary N excretion at fasting was 438 mg/MBS. Fecal N excretion was 36% of the intake. Urinary N excretion was bout 4% of the digested. Urinary N concentration ranged from 1.80 to 8.82 mg/ml and averaged 16.83 mg/ml at fasting. To increase N digestion efficiency is a possible was to reduce N excretion together with drinking water intake which is related to urinary N excretion
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