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Journal of Dairy Science Vol. 69 No. 4 1004-1012
© 1986 by American Dairy Science Association ®
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Effects of Drinking Water Temperature on Physiological Responses of Lactating Holstein Cows in Summer1

J. K. Lanham, C. E. Coppock, K. Z. Milam, J. M. Labore and O. H. Nave

Department of Animal Science

R. A. Stermer and C. F. Brasington

ARS-USDA, Texas A&M University, College Station 77843

ABSTRACT

Nine lactating Holstein cows were offered drinking water of 7.2, 15.6, and 23.9°C in a 3 x 3 Latin square design in Experiment 1. Water was offered for 10 min at 1300 h to simulate time in a milking parlor. Water consumption declined as drinking water temperature decreased. Respiration rates decreased as the drinking water temperature decreased. In Experiment 2, 8 lactating Holstein cows were offered water of 12.8 and 26.7°C in a 2 x 2 changeover design. Results were consistent with Experiment 1. In experiment 3, 16 lactating Holstein cows were offered drinking water of 10, 16, 22, and 28°C in a 4 x 4 Latin square design. Water was offered for 10 min at 1400 h. Respiration rates and deep rectal temperatures were taken before and after watering. Water consumption declined as drinking water temperature decreased, but the cooling effect of the low temperature water was greater. Lower drinking water temperature decreased respiration rates postwatering. Deep rectal temperatures were not affected as drinking water temperature decreased. Both respiration rates and deep rectal temperatures began to increase within 40 min after watering, indicating a transient cooling effect of the chilled water.

FOOTNOTES

1 Technical Article 20637 by the Texas Agricultural Experiment Station 77843. From an M.S. Thesis by J. K. Lanham.




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Copyright © 1986 by the American Dairy Science Association ®.