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Journal of Dairy Science Vol. 57 No. 3 304-307
© 1974 by American Dairy Science Association ®
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Milking Performance and Reproductive Efficiency of Dairy Cows in an Environmentally Controlled Structure1

W. W. Thatcher2, F. C. Gwazdauskas2, C. J. Wilcox2, J. Toms3, H. H. Head2, D.E. Buffington4 and W. B. Fredricksson2

2 Dairy Science
and4 Agricultural Engineering Departments, Institute of Food and Agricultural Sciences University of Florida, Gainesville 36211

ABSTRACT

Effects of a controlled environment on production and reproduction were evaluated with four groups of cows: T1 remained outside 24 h; T2, inside from 1930 h to 0530 h; T3, inside from 0530 h to 1930 h; T4, inside 24 h. Average daily degree-hours above 21 C (T1 to T4) for 1970 (148 days) and 1971 (79 days) were 100, 84, 41, 11 and 71, 62, 19, 0. Milk yield, fat percentage, fat yield, 4% fat-corrected milk, and conception rates were improved by controlled environment. Least squares adjusted, 4% fat-corrected milk yields daily (kg, 208 cows overall) were T1( 14.23; T2, 14.48; T3, 14.96; T4, 15.57. Conception rates to all services (n=305) were T1( 28.1%; T2, 28.4%; T3, 40.0%; T4, 38.8%.

FOOTNOTES

1 Florida Agricultural Experiment Station Journal Series No. 5052.

3 Graham Company, Miami Lakes, Florida 33014.




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