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Journal of Dairy Science Vol. 73 No. 4 1091-1099
© 1990 by American Dairy Science Association ®
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Responses of Lactating Holstein Cows to Chilled Drinking Water in High Ambient Temperatures

D. L. Wilks 1, C. E. Coppock 1, J. K. Lanham 1, K. N. Brooks 1, C. C. Baker 1, W. L. Bryson 1, R. G. Elmore 2, and R. A. Stermer 3

1 Department of Animal Science
2 Department of Large Animal Medicine and Surgery
3 USDA-ARS, Texas A&M University, College Station 77843

In Experiment 1, 12 lactating Holstein cows were provided drinking water of either 10.6 or 27.0°C for 24 h/d in a changeover design to examine the effects of water temperature on feed intake, water intake, respiration rate, rectal temperature, plasma thyroid hormone concentration, and milk yield. The 1st wk of each 3-wk treatment period was for adjustment and the next 2 wk were comparison periods. Least squares means for DM intake as a percentage of body weight were 3.68 and 3.57 for 10.6 and 27.0°C treatment groups. Water intakes in liters per kilogram of dry feed consumed as a percentage of body weight were 21.3 and 20.3. Respiration rates were 70.5 and 81.0 breaths per minute; rectal temperatures were 39.7 and 39.9°C, Triiodothyronine averaged .88 and .75 ng/ml; thyroxine. 42.4 and 39.2 ng/ml; cortisol, 3.03 and 2.06 ng/ml; and progesterone in milk, 4.58 and 3.15 ng/ml for the 10.6 and 27.0°C treatment groups. Milk yield averaged 25.9 and 24.7 kg/d and FCM averaged 25.6 and 23.6 kg/d, respectively.

In Experiment 2, 24 cows given a choice of chilled or warm water showed a clear preference (about 98%) for the warm water. If cows are given chilled water of 10°C continuously, no warm drinking water should be available. Chilled drinking water lowered respiration rates and body temperatures and increased feed intake and milk yield.

Key Words: chilled drinking water • stress hormones • lactating cows

Submitted on June 29, 1989
Accepted on November 1, 1989




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