Induced lactation in nonpregnant cows: profitability and response to bovine somatotropin

Journal of Dairy Science
A L MagliaroR Graboski

Abstract

Significant culling of high-producing cows with low fertility reduces profitability of dairy farms as those cows are replaced with heifers. Induced lactation of nonpregnant cows may be a management alternative to reduce culling and increase profits. The objectives of this study were to evaluate the efficacy of bovine somatotropin (bST) to increase milk production in cows induced into lactation with estrogen plus progesterone, and to determine the profitability of inducing cows into lactation vs. using replacement heifers entering the herd as first-lactation cows. Parity 1 or greater, nonpregnant, healthy Holstein cows (n = 28) were induced into lactation by administration of estradiol-17beta (0.075 mg/kg of body weight [BW] per d) and progesterone (0.25 mg/kg of BW per d) for 7 d. Milking began on d 18. Cows were randomly assigned to control or bST treatment groups on d 37 +/- 20 of milking, and milk production was compared for 70 d. After the 70-d comparison, all cows received bST for the duration of lactation. Cows receiving bST produced more milk (28.4 kg/d) than controls (24.1 kg/d), with variable yields among cows. For the economic analysis, induced cows were compared to first-lactation cows in the same herd using fair mar...Continue Reading

References

Dec 1, 1979·Journal of Dairy Science·R S KensingerR J Collier
Dec 1, 1978·Journal of Dairy Science·S ChakriyaratC J Wilcox
Dec 1, 1992·Journal of Dairy Science·D E Bauman
May 1, 1982·The British Veterinary Journal·K LembowiczL Skrzeczkowski
Mar 1, 1996·Journal of Dairy Science·W C Losinger, A J Heinrichs
Jan 12, 2000·Journal of Dairy Science·D E BaumanR J Collier

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