Hostname: page-component-5c6d5d7d68-qks25 Total loading time: 0 Render date: 2024-08-16T19:00:48.640Z Has data issue: false hasContentIssue false
  • English
  • Français

677. The effect of variations in nutrient intake upon the yield and composition of milk: I. Variations in the amount and type of concentrates fed in winter rations

Published online by Cambridge University Press:  01 June 2009

A. W. A. Burt
A. W. A. Burt
Affiliation:
National Institute for Research in Dairying, University of Reading
Get access Rights & Permissions [Opens in a new window]

Extract

1. A series of five experiments on the effects of variation in the concentrate ration of cows receiving normal diets of hay and grass silage are described.

2. Responses in milk yield to the feeding of additional concentrates occurred in all five experiments and were statistically significant in three of them.

3. Mean responses in four experiments with adequate statistical control ranged from 0·7 to 1·0 lb. milk/lb. additional S.E. at levels of feeding from 90 to 120% of the Woodman standard, and were not economic at prices ruling during the winter of 1955–56.

4. There were indications that the responses varied with the yield of the cow, and in two experiments there was clear evidence that the response to a second addition of 20% in the production ration was approximately half of that to the first.

5. The response to additional S.E. was appreciably reduced when normal protein standards were not maintained in the additional concentrates.

6. A limited substitution of hay for concentrates, which did not alter S.E. intakes appreciably, had no appreciable effect on milk yield.

7. Significant responses of solids-not-fat percentage to the feeding of concentrates above the normal standards occurred in two experiments, but not in two others where the control percentages were lower. The importance of factors other than energy intake in influencing this quantity was emphasized.

Type
Original Articles
Information
Journal of Dairy Research , Volume 24 , Issue 3 , October 1957 , pp. 283 - 295
Copyright
Copyright © Proprietors of Journal of Dairy Research 1957

Access options

Get access to the full version of this content by using one of the access options below. (Log in options will check for institutional or personal access. Content may require purchase if you do not have access.)

References

REFERENCES

(1)Yates, F., Boyd, D. A. & Pettit, G. H. N. (1942). J. agric. Sci. 32, 428.CrossRefGoogle Scholar
(2)Woodman, H. E. (1952). Bull. Minist. Agric., Lond., No. 48.Google Scholar
(3)Jensen, E., Klein, J. W., Rauchenstein, E., Woodward, T. E. & Smith, R. H. (1942). U.S. Dep. Agric. Tech. Bul. No. 815.Google Scholar
(4)Jawetz, M. B. (1955). Dairy Sci. Abstr. 17, Cols. 1–20Google Scholar
(5)Reid, J. T. (1956). Bull. Cornell Univ. agric. Exp. Sta. Memoir, No. 344.Google Scholar
(6)Burt, A. W. A. (1956). Dairy Sci. Abstr. 18, Cols. 883–94.Google Scholar
(7)Holmes, W., Waite, R., MacLusky, D. S. & Watson, J. N. (1956). J. Dairy Res. 23, 1.CrossRefGoogle Scholar
(8)Reid, D. & Holmes, W. (1956). J. Dairy Res. 23, 159.CrossRefGoogle Scholar
(9)Burt, A. W. A. (1957). J. Dairy Res. 24, 296.CrossRefGoogle Scholar
(10)Cochran, W. G., Autrey, K. M. & Cannon, C. Y. (1941). J. Dairy Sci. 23, 937.CrossRefGoogle Scholar
(11)Brody, S. (1945). Bioenergetics and growth. New York: Rheinhold Publ. Corp.Google Scholar
(12)Morris, S. & Ray, S. C. (1939). J. Dairy Res. 10, 165.CrossRefGoogle Scholar
(13)Wright, N. C. (1939). J. Minist. Agric. 46, 251.Google Scholar
(14)Bartlett, S., Foot, A. S., Huthnance, S. L. & Mackintosh, J. M. (1940). J. Dairy Res. 11, 121.CrossRefGoogle Scholar
(15)Davis, H. P., Morgan, R. F., Brody, S. & Ragsdale, A. C. (1937). Univ. Neb. Agric. Exp. Sta Res. Bull. No. 91.Google Scholar
(16)Burt, A. W. A. (1957). J. Dairy Res. 24, 144.CrossRefGoogle Scholar
(17)Lucas, H. L. (1943). J. Dairy Sci. 26, 1011.CrossRefGoogle Scholar
(18)Schneider, B. H. (1947). Feeds of the World, their Digestibility and Composition. West Virginia Agric. Exp. Sta., Morganstown.Google Scholar
(19)Watson, S. J. (1939). The Science and Practice of Conservation: Grass and Forage Crops, Vol. II. London: Fertilisers and Feedingstuffs Journal.Google Scholar
(20)Walker, D. M. & Hepburn, W. R. (1955). J. agric. Sci. 45, 298.CrossRefGoogle Scholar
(21)Walker, D. M. & Hepburn, W. R. (1956). J. agric. Sci. 47, 172.CrossRefGoogle Scholar
(22)Patterson, H. D. (1950). J. agric. Sci. 40, 375.CrossRefGoogle Scholar
(23)Patterson, H. D. (1951). J. R. statist. Soc. (B), 13, 256.Google Scholar
(24)Burt, A. W. A. (1956). Unpublished data.Google Scholar
(25)Saarinen, P., Sami, M. A., Shaw, J. C. & Moore, L. A. (1951). J. Dairy Sci. 34, 287.CrossRefGoogle Scholar
(26)Moore, L. A., Irvin, H. M. & Shaw, J. C. (1953). J. Dairy Sci. 36, 93.CrossRefGoogle Scholar
(27)Riddet, W., Campbell, I. L., MacDowall, F. H. & Cox, G. A. (1941). N.Z. J. Sci. Tech. (A), 23, 80.Google Scholar
(28)Rowland, S. J. (1946). Dairy Ind. 11, 656.Google Scholar
(29)Rook, J. A. F. (1953). Proc. Nutr. Soc. 12 (2), viii.Google Scholar