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Ruminant Nutrition and Forage Utilization
Asian-Australasian Journal of Animal Sciences 1992;5(4): 699-707.
https://doi.org/10.5713/ajas.1992.699    Published online December 1, 1992.
Fate and metabolism of nitrogen in goats fed 15N-labelled rice straw
T. X. Xing, D. Y. He, L. H. He, W. J. Zhou, X. L. Liao, H. P. Chen
Abstract
Three goats were fed with 15N-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 15N assimilated into the bodies of the two slaughtered goats accounted for 38.5 and 23.6% of the total amount of 15N ingestion in the experimental diet by each goat. The 15N excreted via the feces and urine for the three goats accounted for 34.8, 33.2 and 33.9% of the total amount of 15N ingested in the feed of the 3 goats. The recoveries of 15N from the two slaughtered goats were 73.3 and 57.5%, with the corresponding rates of 15N 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.
Keywords: Goats; Nitrogen Metabolism; 15N-Labelled Rice Straw
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