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Journal of Dairy Science Vol. 68 No. 4 973-978
© 1985 by American Dairy Science Association ®
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Effects of Relative Humidity, Maximum and Minimum Temperature, Pregnancy, and Stage of Lactation on Milk Composition and Yield1

L. A. Rodriquez2, G. Mekoimnen3, C. J. Wilcox, F. G. Martin4 and W. A. Krienke

Dairy Science Department, Institute of Food and Agricultural Sciences, University of Florida, Gainesville 32611

ABSTRACT

Composite monthly single-day milk samples from the Florida Agricultural Experiment Station dairy herd 1959 to 1974 were analyzed for composition. Data were 22, 972 observations on five dairy breeds, but major statistical analyses were limited to Jerseys and Holsteins. Minimum relative humidity and maximum and minimum temperatures on day of evening sample were associated with 1.6 to 5.6% of variability within lactation (range for two breeds) of milk and milk constituent yields and 1.1 to 16.5% of constituent percentages. Yields of milk and constituents of the Holsteins seemed more sensitive to climatic variation than did Jersey, but Jersey constituent percentages were more sensitive. Yields were affected only slightly by increasing maximum daily temperatures from 8 to 29°C but declined rapidly at >29°C; fat and protein percentages declined from 8 to 37°C, whereas chloride content increased above 21°C. Stage of lactation and pregnancy effects accounted for about 50% of the variability of yields and 3 to 23% of percentages. Effects were detected also for chloride and acidity percentages, specific gravity, and ratios solids-not-fat to fat and protein to fat.

FOOTNOTES

1 Florida Agricultural Experiment Station Journal Series No. 5446.

2 Centre de Investigaciones Agropecuarias, FONIAP, Araure, Portugesa, Venezuela.

3 Agricultural Experiment Station, University of Ethiopa, Debre Zeit, Ethiopia.

4 Statistics Department.






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Copyright © 1985 by the American Dairy Science Association ®.