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493. Concerning the interpretation of observations, obtained from records and experiments, on milking dairy cows

Published online by Cambridge University Press:  01 June 2009

C. P. Cox
C. P. Cox
Affiliation:
National Institute for Research in Dairying, University of Reading
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Extract

1. Some questions concerning the interpretation of observations on milking dairy cattle are considered.

2. A formula is presented for analysing the contributions of changes in the numerator and denominator to the changes in a percentage or fraction, and the formula is applied to changes in the composition of milk.

3. The depressions of the butterfat and solids-not-fat percentages consequent on diets reduced in hay in a dairy-cattle feeding experiment are examined with this constituent analysis.

The contributions of changes in the magnitudes of the aqueous, butterfat and solids-not-fat constituents to the difference between the butterfat percentages of cows on two treatments, 18 lb. hay/day (control) and 6 lb. hay /day, are about equal. There is an apparent qualitative difference between the effects of the two non-control treatments, and a reduced yield of butterfat would alone largely account for the lower butterfat percentage of cows on the 2 lb. hay /day treatment.

Type
Original Articles
Information
Journal of Dairy Research , Volume 20 , Issue 1 , February 1953 , pp. 1 - 12
Copyright
Copyright © Proprietors of Journal of Dairy Research 1953

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References

REFERENCES

(1)Gaines, W. L. & Davidson, F. A. (1923). Bull. Univ. Ill. Agric. Exp. Sta. no. 245.Google Scholar
(2)Buchanan Smith, A. D. (1936). J. Brit. Dairy Fmrs' Ass. 48, 11.Google Scholar
(3)Mahadevan, P. (1951). J. agric. Sci. 41, 94.Google Scholar
(4)Edwards, J. (1950). J. agric. Sci. 40, 100.CrossRefGoogle Scholar
(5)Balch, C. C., Balch, D. A., Bartlett, S., Cox, C. P. & Rowland, S. J. (1952). J. Dairy Res. 19, 39.Google Scholar
(6)Anon, (1950). Production Division, M.M.B. Report, no. 1.Google Scholar
(7)Mclean, J. W. (1951). Tech. Publ. Lincoln College, Univ. N.Z. no. 7.Google Scholar
(8)Drakeley, T. J. (1948). J. Brit. Dairy Fmrs' Ass. 52, 46.Google Scholar
(9)Campbell, J. W. D. (1931). J. Dairy Res. 3, 52.Google Scholar