Influence of small doses of gonadotropin-releasing hormone following controlled internal drug-release insert removal on reproductive parameters in beef cattle subjected to a fixed-time artificial insemination protocol
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引用次数: 1
Abstract
ABSTRACT Heifers and cows that exhibit estrus before fixed-time AI have increased concentrations of estradiol and greater conception rates compared with those that do not. Our objective was to determine whether small doses of gonadotropin-releasing hormone following controlled internal drug-release insert removal would affect estradiol concentrations, estrus expression, or pregnancy success. Beef cattle (n = 247) were synchronized using the 7-d CO-Synch+CIDR protocol and assigned to 1 of 3 treatment groups (0 μg,10 μg, or 5 + 5 μg of gonadotropin-releasing hormone). Animals were observed for estrus, blood samples were collected, and animals were bred by appointment. Concentrations of estradiol were influenced by time (P
与没有发情的母牛相比，在固定时间人工授精前发情的母牛和小母牛的雌二醇浓度增加，受孕率更高。我们的目的是确定小剂量的促性腺激素释放激素在受控的内部药物释放插入物去除后是否会影响雌二醇浓度、发情表达或妊娠成功。采用7 d co - sync +CIDR方案对247头肉牛进行同步处理，并将其分为3个处理组(促性腺激素释放激素0、10或5 + 5 μg)中的1个。观察动物的发情情况，采集血液样本，预约饲养。雌二醇浓度受时间影响(P
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