N losses, purine N derivatives excretion and intestinal digestible protein requirements of cows at maintenance

  • Susmel P
  • Spanghero M
  • Stefanon B
 et al. 
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Abstract

Three rumen fistulated Simmental cows were fed 4 diets (in 4 experimental periods) obtained by substituting part of the basal fescue hay diet (8 kg/d/cow) with extracted soyabean meal (0, 50, 100 and 150 g/kg hay). Including the soyabean meal gave a range of nitrogen (N) intake from 508 to 1448 mg/kg LW0.75/d and of intestinal digestible protein (PDI) from 2.2 to 6.0 g/kg LW0.75/d. The regression of the apparently digested N (y) with the dietary N content (x) was highly significant (r=0.99; P

Author-supplied keywords

  • Cows
  • Nitrogen
  • Purine derivative
  • Requirement

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