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首页> 外文期刊>Reproduction in Domestic Animals >Lack of effects of an equine chorionic gonadotropin (eCG) administration between days 9 and 15 postpartum on reproductive performance in a Holstein dairy herd
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Lack of effects of an equine chorionic gonadotropin (eCG) administration between days 9 and 15 postpartum on reproductive performance in a Holstein dairy herd

机译：在第9天和第15天和第15天之间缺乏大马绒毛膜促性腺激素（ECG）给药的影响 - 在霍尔斯坦乳制牛群中的生殖表现

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Contents Recently, it has been demonstrated that administration of equine chorionic gonadotropin (eCG) in the postpartum period in dairy cows can enhance follicle growth, reduce the interval from calving to first ovulation and increase plasma estradiol concentrations, and, thus, could enhance reproductive performance in a dairy herd when administered on day 6 postpartum. The aim of this study was to investigate the effects of a single dose of eCG between days 9 and 15 postpartum on parameters of reproductive performance in dairy cows. German Holstein cows (n=1937; primiparous cows: n=748; pluriparous cows: n=1189) in a commercial dairy farm were randomly assigned to three experimental groups. Animals within the group eCG received a single dose of 600 IU eCG intramuscularly (i.m.) between days 9 and 15 postpartum followed by an i.m. administration of 500 g cloprostenol after 14days. Those of treatment group PG received cloprostenol only between days 23 and 29 postpartum. Cows of the control group remained untreated. Starting on day 49 postpartum, cows were subjected to a Presynch-Ovsynch protocol and inseminated artificially. The impact of application time (days postpartum) of eCG on the intervals calving to first service and calving to conception was statistically not significant. Outcomes of reproductive performance (i.e. first service conception rate, proportion of pregnant cows until 100 and 150days in milk [DIM], number of inseminations until 150 DIM, calving to first service interval and calving to conception interval) did not differ significantly between treatment group eCG and group PG compared to control group. Regarding postpartum eCG administration, significant interactions between treatment and parity, season, milk yield, and early puerperal disorders, respectively, could not be shown. In conclusion, an eCG treatment of dairy cows between days 9 and 15 postpartum to increase reproductive performance cannot be recommended under the given circumstances.
机译：含量最近，已经证明，在奶牛的产后时期的马绒毛膜促性腺激素（ECG）的给药可以增强卵泡生长，从钙肥大到首先排卵，增加血浆雌二醇浓度，因此可以提高生殖性能在第6天施用时在乳制品牛群中。本研究的目的是探讨单剂量ECG在第9天和第15天之间的影响乳制奶牛的生殖性能参数。德国Holstein奶牛（n = 1937;初奶牛：n = 748;多次货物，商业乳制品农场中的多次奶牛：n = 1189）被随机分配到三个实验组。集团内的动物在第9天和第15天之间接受了一剂600 IU ECG Intramularly（即）。 14天后给药500克氯吡啶醇。治疗组PG仅在第23天和第29天之间接受ClOpostenol。对照组的奶牛保持未经治疗。从第49天开始，奶牛受到预先育龄议定书，并人为地授予。 ECG施用时间（天产后）对第一次服务的间隔和否决概念的影响是统计学上的。生殖性能的结果（即牛奶中的孕妇比例为100和150天，牛奶次数为150次暗淡，否则第一次服务间隔和概念间隔）在治疗组之间没有显着差异。 ECG和Group PG与对照组相比。关于产后ECG管理，诊断和平等，季节，牛奶产量和早期卵巢障碍之间的显着相互作用，无法显示出来。总之，在第9天和第15天之间的乳制品奶牛的心电图治疗不能在给定的情况下建议提高生殖绩效。

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