Study of cattle and sheep suffering stress from natural protein shortage has thrown light on the mechanisms by which they are able to make good use of nitrogen, thus conserving this body nutrient. Doubt has been cast on the assumption that protein requirements for maintenance, for animals of all species, are governed solely by metabolic body size, but the nitrogen-sparing processes for cattle and sheep are not yet well understood.
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References
1.
AnnisonE. F., ChalmersM. I., MarshallS. B. M., and SyngeR. L. M. (1954). J. agric. Sci., 44, 270.
2.
BlaxterK. L. (1959). In Scientific Principles of Feeding Farm Stock, p. 21. London, Farmer and Stock-Breeder Publications Ltd.
3.
BrodyS. (1945). Bio-energetics and Growth. New York, Reinhold Publishing Corp.
4.
ChalmersM. I., and SyngeR. L. M. (1954). J. agric. Sci., 44, 263.
5.
ElliottR. C., ReedW. D. C., and ToppsJ. H. (1964). Brit. J. Nutr., 18, 519.
6.
ElliottR. C., and ToppsJ. H. (1963). Anim. Prod., 5, 269.
7.
ElliottR. C., and ToppsJ. H. (1963). Brit. J. Nutr., 17, 539.
8.
ElliottR. C., and ToppsJ. H. (1963). Brit. J. Nutr., 17, 549.
9.
ElliottR. C., and ToppsJ. R. (1963). Nature, Land., 197, 668.
10.
ElliottR. C., and ToppsJ. H. (1964). Anim. Prod., 6, 345.
11.
ElliottR. C., and ToppsJ. H. (1964). Brit. J. Nutr., 18, 245.
12.
HouptT. R. (1959). Amer. J. Physiol, 197, 115.
13.
LewisD. (1962). J. agric. Sci., 58, 73.
14.
LewisD., and McDonaldI. W. (1958). J. agric. Sci., 51, 108.
15.
LivingstonH. G., PayneW. J. A., and FriendM. T. (1962). Nature, Land., 194, 1057.
16.
MarstonH. R. (1955). In Progress in the Physiology of Farm Animals, 2, Chapter 11 (HammondJ., editor). London, Butterworth.
17.
MaynardL. A., and LoosliJ. K. (1956). Animal Nutrition, 4th ed.New York, McGraw-Hill Book Company Inc.
18.
MunroH. N. (1964). Proc. Nutr. Soc., 23, 1.
19.
Schmidt-NielsonB., and OsakiH. (1958). Amer. J. Physiol., 193, 657.
20.
Schmidt-NielsenB., Schmidt-NielsenK., HouptT. R., and JarnumS. A. (1957). Amer. J. Physiol., 188, 477.
21.
SchneiderB. H. (1947). Feeds of the World. Their digestibility and composition. University of West Virginia Agric. Exp. Station.
22.
SomersM. (1961). Aust. J. exp. Biol. med. Sci., 39, 145.
