肉牛同期发情效果影响因素的研究

Effects of beef cattle estrus synchronization effect factors

中文关键词: 肉牛  同期发情  发情率  受胎率

英文关键词: beef cattle  estrus at the same time  estrus rate  conception rate

中文摘要:

      (目的)为了研究同期发情处理方法、繁殖状况、品种、体重等对肉牛同期发情效果的影响,(方法)选择140头不同繁殖状况、品种、体重的肉牛,随机分为3组,分别采用CIDR+第10天肌注PMSG+第11天肌注PGF_2α(埋栓Ⅰ组)、CIDR+第9天肌注PMSG+第11天肌注PGF_2α(埋栓Ⅱ组)、肌注PGF_2α+PMSG(PGF_2α组)的方法进行同期发情处理,(结果)结果表明：三种不同处理方法相比,PGF_2α组发情率为87.10%,埋栓Ⅰ组、Ⅱ组母牛发情率分别为97.83%、98.41%,显著高于PGF_2α组(P≤0.05)；PGF_2α组处理牛受胎率为83.87%,埋栓Ⅰ组、Ⅱ组处理牛受胎率分别为89.13%、84.13%,高于PGF_2α组,但差异不显著(P≥0.05)；育成牛与经产牛发情时间相比,埋栓组12-24 h内出现发情症状的经产牛占比为27.27%,育成牛占比为60%,显著高于经产牛(P≤0.05),25-36 h内出现发情症状的经产牛占比和育成牛占比差异不显著(P≥0.05),育成牛36 h内已全部发情；育成牛与经产牛整体发情率无显著差异(P≥0.05)；埋栓组经产牛受配率为93.81%,育成牛为80%,显著高于育成牛(P≤0.05)不同品种和体重对肉牛同期发情有一定影响但差异不显著(P≥0.05)。 (结论)综上,埋栓处理肉牛的同期发情效果更好,肌注PGF_2α+ PMSG更经济实惠；育成牛发情时间较经产牛耕早且更早结束。

英文摘要:

      (Objective) In order to study the effects of estrus treatment methods, reproductive status, breed, weight, etc. on the effect of estrus at the same time in beef cattle, (method) 140 beef cattle with different breeding conditions, breeds, and weights were selected and randomly divided into 3 groups, respectively CIDR + intramuscular injection of PMSG on day 10 + intramuscular injection of PGF2α on day 11 (embedded suppository group I), CIDR + intramuscular injection of PMSG on day 9 + intramuscular injection of PGF2α on day 11 (embedded suppository group II), intramuscular injection of PGF2α + PMSG (PGF2α group) The method of estrus treatment at the same time (result) showed that: compared with the three different treatment methods, the estrus rate of the PGF2α group was 87.10%, and the estrus rate of the cows in the embedding Ⅰ and Ⅱ groups were 97.83% and 98.41%, respectively, which was significantly higher. In the PGF2α group (P≤0.05); the conception rate of cattle in the PGF2α group was 83.87%, and the conception rates of the cattle in the embedding Ⅰ and Ⅱ groups were 89.13% and 84.13%, respectively, which were higher than those in the PGF2α group, but the difference was not significant (P≥0.05); Comparing the estrus time of the bred cattle and the bred cattle, the percentage of the estrus in the embedding group was 27.27% within 12-24 hours, and the percentage of bred cattle was 60%, which was significantly higher than that of the bred cattle ( P≤0.05), there is no significant difference between the proportion of estrus and the proportion of bred cattle with estrus symptoms within 25-36 hours (P≥0.05), and all estrus has been in estrus within 36 hours; There was no significant difference in the rate (P≥0.05); the mating rate of the bred cattle in the embedding group was 93.81%, and that of the bred cattle was 80%, which was significantly higher than that of the bred cattle (P≤0.05). The difference is not significant (P≥0.05). (Conclusion) To sum up, the estrus effect of embedding the suppository for beef cattle at the same time is better, and intramuscular injection of PGF2α + PMSG is more economical and economical; the estrus time of breeding cattle is earlier and ends earlier than that of production cattle.