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首页> 外文期刊>Tropical Animal Health and Production >Birth weight, reproduction traits and effects of inbreeding in Nicaraguan Reyna Creole cattle
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Birth weight, reproduction traits and effects of inbreeding in Nicaraguan Reyna Creole cattle

机译：尼加拉瓜雷纳克里奥尔牛的出生体重，繁殖特征及近交影响

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摘要

Reyna Creole cattle in Nicaragua comprise about 650 purebred animals, and the breed has been shown to have a high level of inbreeding. To characterize the breed, as basis for a conservation program, information from two herds on birth weight (BW, n = 1097), age at first calving (AFC, n = 449) and calving interval (CI, n = 1,347) was analysed. Overall averages were 27.8 kg for BW, 37.4 months for AFC and 424 days for CI. Large differences between the herds were observed for all traits. Thus, there would be opportunities for management interventions to improve reproduction results. The heritability for BW was 0.34. For CI, the heritability of 0.20 and the additive genetic standard deviation of 36 days were comparatively high values. No genetic variation was found in AFC. Estimated inbreeding effects were associated with large standard errors due to the small size of the data and incompleteness of pedigrees. Nevertheless, significant effects were shown of dam inbreeding level on all traits. For each percentage of increased inbreeding, BW decreased by 0.06 kg, AFC increased by 3.5 days and CI increased by 1.4 days. The effects of the inbreeding level of the individual itself were not significant. The relatively good reproduction traits of Reyna Creole cattle shown in this study, despite high inbreeding levels, will be supplemented with a characterization of milk production traits.
机译：尼加拉瓜的雷纳·克里奥尔（Reyna Creole）牛约有650只纯种动物，而且该品种的近交水平很高。为了表征该品种，作为保护计划的基础，分析了两个种群的出生体重（BW，n = 1097），第一次产犊的年龄（AFC，n = 449）和产犊间隔（CI，n = 1,347）的信息。 。 BW的总体平均水平为27.8 kg，AFC的总体平均水平为37.4个月，CI为424天。在所有性状上观察到牛群之间的差异很大。因此，将有机会进行管理干预以改善繁殖结果。 BW的遗传力为0.34。对于CI，遗传力为0.20，加成遗传标准差为36天，是一个相对较高的值。在AFC中未发现遗传变异。由于数据量小和谱系不完整，估计的近交效应与较大的标准误差有关。然而，对所有性状的大坝近交水平显示出显着影响。对于近交增加的每个百分比，体重减轻0.06千克，AFC增加3.5天，CI延长1.4天。个人近交水平的影响并不显着。尽管近亲繁殖水平高，本研究中显示的雷纳克里奥尔人的牛相对较好的繁殖性状将补充牛奶生产性状的特征。

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