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首页> 外文期刊>Animal Reproduction Science >Effect of alternating bulls as a management tool to improve the reproductive performance of suckled Zebu cows in the humid tropics of Costa Rica
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Effect of alternating bulls as a management tool to improve the reproductive performance of suckled Zebu cows in the humid tropics of Costa Rica

机译：多头公牛作为管理工具提高哥斯达黎加潮湿热带地区乳牛的繁殖力的作用

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摘要

A study was undertaken to evaluate the effect of alternating bulls between a single and a multiple sire mating (MSM) program on the reproductive performance of suckled Zebu scows raised under range conditions in the humid tropics of Costa Rica. Multiparous Zebu cows (n = 94) suckling calves were distributed between two experimental trials (A and B) consisting of 47 animals each. A single sire mating (SSM) system was alternated weekly with a MSM system with three bulls. This period lasted for 8 weeks. To facilitate estrous expression, four cows were strategically synchronized (estrus-stimulated) in alternate weeks. Courtship predominated over mounting under non-stimulated estrus, for each mounting performed an average of 6.0 and 63 courtship activities were recorded in the SSM and MSM, respectively. Under the influence of strategic synchronization corresponding values were 3.9 and 4.2 in the SSM and MSM,1 respectively (P > 0.05). Blood samples for progesterone evaluation were taken twice weekly. All, cows in trial A were in anestrus at the start of the study. By second week, 5 out of the 47 cows had initiated estrous cycles and by the third week six were pregnant. In contrast in trial B, 9 out of 47 had initiated estrous cycles before interacting with the bulls and on week 3, only two females had become pregnant and three had initiated estrous cycles. Significant differences were found in the cumulative percentage of cows pregnant between trials A and B (P < 0.05). Even though these results occurred, the rotation of the bulls (one or three), or the type of cows (estrus-stimulated or not) did not influence the results in this study.
机译：进行了一项研究，以评估单公母和多公母交配（MSM）计划对多头公牛对哥斯达黎加潮湿地区在一定范围条件下饲养的哺乳类牛的繁殖性能的影响。在两个分别由47只动物组成的实验试验（A和B）之间分配了多头Zebu奶牛（n = 94）。每周有一个公母交配（SSM）系统和一个由三头公牛组成的MSM系统。这个时期持续了8个星期。为了促进发情表达，每隔几周对四头母牛进行策略性同步（发情刺激）。在未刺激的发情期下，求爱比坐骑更为重要，对于每个坐骑，在SSM和MSM中分别记录了平均6.0和63个求爱活动。在策略同步的影响下，SSM和MSM，1的对应值分别为3.9和4.2（P> 0.05）。每周两次采集用于孕酮评估的血样。在研究开始时，所有在试验A中的牛都处于发情期。到第二周，在47头母牛中，有5头开始发情周期，到第三周，已有6头怀孕。与之相反，在试验B中，在47个中有9个在与公牛互动之前已经开始发情周期，并且在第3周时，只有两名女性怀孕并且有3个已经开始发情周期。在试验A和B之间，发现怀孕母牛的累积百分比存在显着差异（P <0.05）。即使发生了这些结果，公牛的轮换（一头或三头）或奶牛的类型（是否发情）也不会影响本研究的结果。

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