Asian-Australasian Journal of Animal Sciences

Asian Australasian Association of Animal Production Societies (아세아태평양축산학회)
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FATE AND METABOLISM OF NITROGEN IN GOATS FED 15N-LABELLED RICE STRAW

  • Xing, T.X. (Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences) ;
  • He, D.Y. (Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences) ;
  • He, L.H. (Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences) ;
  • Zhou, W.J. (Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences) ;
  • Liao, X.L. (Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences) ;
  • Chen, H.P. (Changsha Institute of Agricultural Modernization, Chinese Academy of Sciences)
  • Received : 1992.04.15
  • Accepted : 1992.07.24
  • Published : 1992.12.01
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Abstract

Three goats were fed with $^{15}N$-labelled rice straw to study the characteristics of digestion, assimilation, metabolism and excretion of C and N compounds from rice straw. It was shown that the amount of $^{15}N$ assimilated into the bodies of the two slaughtered goats accounted for 38.5 and 23.6% of the total amount of $^{15}N$ ingestion in the experimental diet by each goat. The $^{15}N$ excreted via the feces and urine for the three goats accounted for 34.8, 33.2 and 33.9% of the total amount of $^{15}N$ ingested in the feed of the 3 goats. The recoveries of $^{15}N$ from the two slaughtered goats were 73.3 and 57.5%, with the corresponding rates of $^{15}N$ loss 26.7 and 42.5% respectively. The amino acids digestibilities were 68.7 and 54.0%, while the digestibilities of carbohydrates were 74.8 and 67.7% respectively for goats 1 and 3.

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