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Comparison of Two Different Protocols for Induction of Parturition in Heifers with or without Estradiol Benzoate

Journal of Life Sciences 2017年第1期11卷 30-34页

作者： Najmeh Mehrvar Hossein Hamali Adel Saberivand Graduated Student Veterinary Faculty University of Tabriz Tabriz 51666164 71 Iran Department of Clinical Sciences Veterinary Faculty University of Tabr& Tabr& *** Iran

Objectives of this study were to investigate the efficacy of dexamethasone in combination with estradiol benzoate in controlled induction of parturition in heifers, especially in the subjects of retained fetal membranes.and dystocia caused by fetal oversize. A total number of 100 Holstein-Friesian heifers aged 24-25 months, mean weight 450 kg and body condition score of 3-4 from a dairy herd located in the suburb of Tabriz with similar nutrition and management systems were allocated at random into two groups. Group A （Control, n = 50） heifers, after passing the minimum 270 d of pregnancy were injected with 30 mg dexamethasone IM. Group B （Treatment, n = 50） heifers with the same period of pregnancy received 30 mg dexamethasone plus 20 mg estradiol benzoate IM on the same days of pregnancy. The overall durations of initial treatments to induction of parturition were （41.50 ~ 2.65） h in group A and （37.50 ：i： 1.27） h in group B. In group A, more dystocia cases were observed than in group B. After parturition, group A showed a higher percentage of retention of fetal membranes.as well as the calf mortality and dystocia compared to group B. The differences between two groups were statistically significant （P 〈 0.05）. In conclusion, our results indicate that induction of parturition by estradiol benzoate and dexamethasone together will be more effective than dexamethasone alone because of the less retention of fetal membranes. easy calving and shorter time from induction to parturition.

关键词： Dexamethasone estradiol benzoate heifer parturition retained fetal membranes.

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