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Chilled Drinking Water Effects on Lactating Holstein Cows in Summer¹

Department of Animal Science

C. F. Brasington and R. A. Stermer

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

ABSTRACT

In Experiment 1, 12 multiparous lactating cows (six per group) were offered drinking water ad libitum at temperatures of 10 or 30°C in a switchback design. The treatment group received 10°C water from 1235 to 2000 h and was then changed to 30°C water for the remaining 16.5 h/d. The control group received 30°C water 24 h/d. Respiratory rates, rectal temperatures, and rumen motilities were measured at 1100, 1440, and 1810 h, 3 d/wk. Water consumed was recorded for 1235 to 2000 h and 2001 to 1234 h of the next day. Water consumption for the treatment group was 3.90 L/h per cow compared to 5.40 L/h per cow for the control group from 1235 to 2000 h. However, the 10°C water absorbed 65.6 kcal/h more heat than the 30°C water. No differences were found in respiratory rates, rectal temperatures, rumen motilities, or milk yield. Cows that drank 10°C water consumed 3.67 kg of feed DM/100 kg of body weight compared with 3.36 kg of feed for the controls.

In Experiment 2, the same two groups of cows were offered 9.5°C water ad libitum for 24 h/d or 27.5°C water for a 48 h comparison. The treatment group tended to consume more water than the control group and to have lower respiratory rates and body temperatures.

¹ Technical Article 23331 by the Texas Agricultural Experiment Station, College Station 77843.

² Present address is Department of Dairy Science. Virginia Tech, Blacksburg 24061.

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