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Net absorption from portal-drained viscera of nitrogenous compounds by beef heifers fed on diets differing in protein solubility or degradability in the rumen

Published online by Cambridge University Press:  09 March 2007

Gerald B. Huntington
Gerald B. Huntington
Affiliation:
United States Department of Agriculture, Ruminant Nutrition Laboratory, Room 124, Building 200, BARC-East, Beltsville, MD 20705, USA
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Abstract

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1. The objective of the present study was to evaluate effects of in vitro rumen solubility or degradability of dietary protein on net absorption of nitrogenous compounds from portal-drained viscera of beef heifers.

2. Four protein sources, casein, soya-bean meal, maize-gluten meal and blood meal provided about two-thirds of total dietary nitrogen in semi-purified diets given to four beef heifers in a 4 x 4 Latin square design.

3. Although in vitro degradability of dietary N ranged from 842 (casein) to 310 (blood meal) g/kg total dietary N, net absorption of ammonia-N or α-amino-N was not significantly different (P > 0.10) among diets. However, net absorption of NH3-N tended to decrease and net absorption of α-amino-N tended to increase as intake of in vitro undegradable N increased. Net transfer of urea-N from plasma to portal-drained viscera was greater (P < 0.10) when heifers were fed on soya-bean meal than when fed on maize-gluten meal or blood meal.

4. The findings show with all diets that the non-protein-nitrogenous compounds, NH3 and urea, played a substantial role in absorption and transfer of N. Overall, net absorption of NH3-N was 61% of net absorption of α-amino-N, and transfer of urea-N from plasma to portal-drained viscera was 80% ofnet absorption of α-amino-N.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 57 , Issue 1 , January 1987 , pp. 109 - 114
Copyright
Copyright © The Nutrition Society 1987

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