J. Anim Sci.
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J. Anim Sci. 1974. 38:186-191.
© 1974 American Society of Animal Science
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Nitrogen Metabolism of White-Tailed Deer

Charles T. Robbins1, Ronald L. Prior2, Aaron N. Moen1 and Willard J. Visek2,3,

New York College of Agriculture and Life Sciences, Cornell University, Ithaca, 14850

Abstract

Urea kinetics were examined in two captive white-tailed deer fawns with 14C-urea. The fawns were fed diets ranging in dietary protein content from 5.14 to 26.00%. Urea pool size and urinary urea excretion rate increased as dietary protein content and plasma urea concentration increased. The percent of urea recycled ranged from 92.3% to 40.6% as dietary protein content increased from 5 to 26%. Endogenous urinary nitrogen was estimated as 0.115 g/kg BW0·75/day. The average biological value of the dietary protein fell from 87.30% to 54.80% as the dietary protein content increased from 5.14 to 26.00%. The true protein digestibility (93.7%±8.4) and metabolic fecal nitrogen excretion (7.55 ±3.36 g N/kg dry matter intake) for white-tailed and mule deer consuming natural forages were calculated from the results of digestion trials reported in the literature.

Footnotes

1 Department of Natural Resources.

2 Department of Animal Science.

3 We gratefully acknowledge financial support from the New York State Department of Environmental Conservation (Project W-124-R), The National Rifle Association, and an NIH Comparative Gastroenterology Training Grant (IT01AMO5684-02). The technical assistance of Mrs. Mabel Goetchius, William Armstrong, Fredrick L. Jacob sen and Barbara Robbins is appreciated. Thanks are extended to Dr. Peter J. Van Soest and Dr. Richard T. Houpt for their comments on the manuscript.






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Copyright © 1974 by the American Society of Animal Science.