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Department of Animal Science, Oregon State University, Corvallis 97331
ABSTRACT
The effect of a young calf on dairy cows undergoing hormonal inducement to lactate was investigated. Fourteen Holstein, Jersey, and Brown Swiss cows were paired and assigned randomly to two groups. Each cow received .1 mg 17-ß-estradiol and .25 mg/kg body weight progesterone daily for 7 days. A male Holstein calf under 14 days of age was placed with each cow of one group during induction and prior to milking while the other group served as a control. Milk production was recorded for the initial 90 days on 12 cows and for 305 days on 6 of the 12 cows. Milk secretion was induced successfully in that all cows produced in excess of 10 kg/day. First secretion was at 10.1 ± 2.0 days for the control group and at 8.9 ± 1.1 days for the experimental group. The control group had an extended 305-day mean production of 4292 ± 390 kg which was not significantly different from 4731 ± 290 kg for cows in the experimental group. Compared to the previous lactation, milk production was 55 ± 8% for the control group and 63 ± 3% for the experimental group. Six cows allowed to complete lactations produced at 80 ± 2% of their previous lactations.
1 Technical Paper No. 4614, Oregon Agricultural Experiment Station.
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  A. L. Magliaro, R. S. Kensinger, S. A. Ford, M. L. O'Connor, L. D. Muller, and R. Graboski Induced Lactation in Nonpregnant Cows: Profitability and Response to Bovine Somatotropin J Dairy Sci, October 1, 2004; 87(10): 3290 - 3297. [Abstract] [Full Text] [PDF]
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