同期发情的牧场繁育母马的繁殖力

Fertility of pasture bred mares in synchronized oestrus.

作者信息

Bristol F

机构信息

Department of Herd Medicine and Theriogenology, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Canada.

出版信息

J Reprod Fertil Suppl. 1987;35:39-43.

PMID:3479593

Abstract

Oestrus was synchronized in 220, 300 and 272 mares in 1983, 1984 and 1985 respectively. Mares were given two injections of 250 micrograms fenprostalene 15 days apart except in 1983 and 1984 when 56 and 53 of the synchronized mares were given 1-10 daily injections of 150 mg progesterone and 10 mg oestradiol-17 beta to delay and synchronize post-partum oestrus. At 2 days after the second PG injection or 7 days after the last progesterone + oestradiol treatment, mares were divided into groups of 15-21, and each group was placed in a separate pasture with a stallion for 7 weeks. Pregnancy rates were 87.7, 93.7 and 97.1%, and foaling rates were 72.3, 89.7 and 94.1% in 1983, 1984 and 1985 respectively. The number of abortions occurring mainly between 3 and 6 months of gestation varied from 34 (17.8%) in 1983 to 12 (4.3%) in 1984 and 8 (3.0%) in 1985.

摘要

1983年、1984年和1985年分别有220匹、300匹和272匹母马的发情期被同步化。母马每隔15天注射两次250微克的氯前列烯醇，不过在1983年和1984年，分别有56匹和53匹同步化的母马每天注射150毫克孕酮和10毫克雌二醇-17β，共注射1 - 10天，以延迟和同步产后发情期。在第二次前列腺素（PG）注射后2天或最后一次孕酮 + 雌二醇治疗后7天，将母马分成15 - 21匹的组，每组被安置在一个单独的牧场中，并与一匹种马相处7周。1983年、1984年和1985年的妊娠率分别为87.7%、93.7%和97.1%，产驹率分别为72.3%、89.7%和94.1%。主要发生在妊娠3至6个月之间的流产数量从1983年的34例（17.8%）到1984年的12例（4.3%）和1985年的8例（3.0%）不等。