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The Thai Journal of Veterinary Medicine

Abstract

Twenty one infertile crossbred dairy cattle were divided into three groups and treated as below. The first group (5 cows) was treated with 17 B-estradiol (10 mg) and progesterone (50 mg) twice a day for 7 consecutive days. The second (5 cows) and third (11 heifers) groups received 17B- estradiol (20 mg) and progesterone (50 mg) twice a day for 3.5 consecutive days (7 doses). After steroid treatment, 5 injections of 2 mg of reserpine were given subcutaneously every second day to each of all treated animals. In response to the treatments, there were 4, 2, and 8 animals from the first, second, and third group respectively were successfully induced to lactate. Milk yields for the period of 4 months averaged 690.7 ± 117.7, 1051.2 ± 65.0, and 653.7 ± 245.7 kg from the respective groups. Comparing to the previous lactation, it was found that milk yield from this study was around 60-75 percent of the normal lactation. The butter fat content was found to be normal.

Publisher

Faculty of Veterinary Science, Chulalongkorn University

First Page

189

Last Page

200

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