The Thai Journal of Veterinary Medicine


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.



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