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The effects of protein degradability and food intake on milk yield and composition in cows in early lactation

Published online by Cambridge University Press:  09 March 2007

E. R. Ørskov ,
G. W. Reid  and
I. McDonald
E. R. Ørskov
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
G. W. Reid
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
I. McDonald
Affiliation:
Rowett Research Institute, Bucksburn, Aberdeen AB2 9SB
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Abstract

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1. In two experiments measurements were made of food intake, live-weight change, milk yield and milk composition in early lactation when dairy cows were given diets containing varying proportions of protein as fish meal (low rumen degradability) or as groundnut meal (high rumen degradability). In a preliminary trial measurements were also made with cows given supplements of either fish meal or barley and fed at a restricted level of feeding.

2. When metabolizable energy (ME) intake exceeded 160 MJ/d there was no evidence of responses to changes in protein degradability, but at ME intakes below 135 MJ/d increases in the supply of undegradable protein led to increases in fat-corrected milk yield, protein content and live-weight loss.

3. The interaction between energy intake and protein degradability is unexpected because net protein:net energy requirement increases as milk yield increases, but may be explained in terms of differential effects of changing rumen outflow rates on degradabilities.

Type
Papers on General Nutrition
Information
British Journal of Nutrition , Volume 45 , Issue 3 , May 1981 , pp. 547 - 555
Copyright
Copyright © The Nutrition Society 1981

References

REFERENCES

Association of Official Agricultural Chemists (1965). Official Merhoh of Analysis, 10th ed., p. 222. Washington, DC: Association of Official Agricultural Chemists.Google Scholar
Broster, W. H. (1972). Dairy Sci. Abstr. 34, 265.Google Scholar
Clark, J. H. (1975). J. Dairy Sci. 48, 1178.Google Scholar
Clay, A. B., Buckley, B. A., Hasballah, M. & Satter, L. D. (1978). J. Dairy Sci. 61, 170.Google Scholar
Davidson, I., Mathieson, I. & Boyne, A. W. (1970). Analyst, Lond. 13, 461.Google Scholar
Derrig, R. G., Clark, J. H. & Davis, C. L. (1974). J. Nutr. 104, 151.CrossRefGoogle Scholar
Flatt, W. P., Moe, P. W., Munson, A. w. & Cooper, T. (1967). In Energy Metabolism m Farm Animals, p. 235. [Blaxter, K. L., Thorbek, G. and Kielanowski, J., editors]. Newcastle: Oriel Press Ltd.Google Scholar
Foldager, J. & Huber, J. T. (1978). J. Dairy Sci. 61, 173.Google Scholar
Gaines, W. L. & Overman, O. R. (1938). J. Dairy Sci. 21, 261.CrossRefGoogle Scholar
Kaufmann, W. (1979). In Feeding Strategies for the High Yielding Dairy Cow, p. 90 [Broster, W. H. and Swan, H., editors]. London: Granada Publishing Ltd.Google Scholar
Kaufmann, W. & Lupping, W. (1979). Z. Tierphysiol. Tierernahr. Futtermittelk 41, 202.CrossRefGoogle Scholar
Moe, P. W., Tyrrell, H. F. & Flatt, W. P. (1970). In Energy Metabolism of Farm Animals, p. 65 [Schurch, A. and Wenk, C., editors]. Zurich: Juris Verlag.Google Scholar
Oldham, J. D. & Sutton, J. D. (1979). In Feeding Strategies for the High Yielding Dairy Cow, p. 114 [Broster, W. H. and Swan, H., editors]. London: Granada Publishing Ltd.Google Scholar
Ørskov, E. R. (1977). Wid Rev. Nutr. Diet. 26, 229.Google Scholar
Ørskov, E. R., Grubb, D. A. & Kay, R. N. B. (1977). Br. J. Nutr. 38, 397.Google Scholar
Ørskov, E. R. & McDonald, I. (1979). J. agric. sci., Camb. 92, 499.CrossRefGoogle Scholar
Ranawana, S. S. E. & Kelloway, R. C. (1977 a). Br. J. Nutr. 37, 67.CrossRefGoogle Scholar
Ranawana, S. S. E. & Kelloway, R. C. (1977 b). Br. J. Nutr. 37, 395.Google Scholar
Robinson, J. J., Fraser, C., Gill, J. C. & McHattie, I. (1974). Anim. Prod. 19, 331.Google Scholar
Roy, J. H. B., Balch, C. C., Miller, E. R.. Ørskov, E. R. & Smith, R. H. (1977). In Protein Metabolism and Nutrition, p. 126 [Taminga, S., editor]. Wageningen Centre for Agricultural Publishing and Documentation.Google Scholar
Swan, H. (1979). In Feeding Strategies for the High Yielding Dairy Cow, p. 49 [Broster, W. H. and Swan, H., editors]. London: Granada Publishing Ltd.Google Scholar
Van Soest, P. J. (1963). J. Ass. off agric. Chem. 46, 829.Google Scholar