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低胎次日本黑牛重复配种对商品奶牛-犊牛生产后续繁殖力的纵向影响。

Longitudinal effect of repeat breeding in Japanese Black beef cattle at a low parity on subsequent fertility in commercial cow-calf operations.

机构信息

Course of Animal and Grassland Sciences, Graduate School of Agriculture, University of Miyazaki, Miyazaki, 889-2192, Japan.

Miyazaki Agricultural Mutual Aid Association, Miyazaki, 880-0852, Japan.

出版信息

Theriogenology. 2022 Sep 1;189:177-182. doi: 10.1016/j.theriogenology.2022.05.016. Epub 2022 May 28.

Abstract

Repeat breeding (RB) has been defined as failure to conceive from three or more regularly spaced services in the absence of detectable abnormalities, and cause economic loss on the farm owing to a declining conception rate. This study aimed to evaluate the reproductive characteristics of RB in Japanese Black cattle by assessing the longitudinal effect of RB at a low parity on subsequent fertility raised in commercial cow-calf operations. Data used in this study were collected from 764 farms in Miyazaki. Data from 2005 until 2014 comprised 158,945 AI records with 80,453 parity records for 22,565 cows. The effect of RB at heifers and parities 1 and 2 cows on subsequent fertility and survival on four consecutive parities was investigated. The results showed that cows with the number of inseminations to conception (INS) of ≥4 at a low parity had a higher probability of being RB again at subsequent parities compared with cattle with INS 1 or 2. Additionally, the degree of the negative effect of an INS ≥4 on fertility and survival increased as they became older. On the other hand, cows with an INS of 2 had similar fertility and survival with those with an INS of 1. In summary, this study suggests that repeat breeders at a low parity have a higher probability of RB again at subsequent parities compared with cattle with INS 1 or 2, and the negative effect of an INS ≥4 increases as parity increases.

摘要

重复配种(RB)被定义为在没有可检测到的异常情况下,三次或更多次定期配种后未能受孕,并且由于受孕率下降而在农场造成经济损失。本研究旨在通过评估低胎次 RB 对商业奶牛-小牛经营中随后生育力的纵向影响,评估日本黑牛的繁殖特征。本研究使用的数据来自宫崎县的 764 个农场。2005 年至 2014 年的数据包括 158945 次人工授精记录和 22565 头奶牛的 80453 胎记录。研究了低胎次后备牛和第 1 胎和第 2 胎奶牛 RB 对随后的生育力和连续 4 胎的存活率的影响。结果表明,与 INS 为 1 或 2 的牛相比,低胎次 INS≥4 的牛再次配种的可能性更高。此外,INS≥4 的负面影响程度随着胎次的增加而增加。另一方面,INS 为 2 的牛与 INS 为 1 的牛具有相似的生育力和存活率。总之,本研究表明,与 INS 为 1 或 2 的牛相比,低胎次 RB 的牛再次 RB 的可能性更高,并且随着胎次的增加,INS≥4 的负面影响增加。

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