Inbreeding depression of reproductive traits in Japanese Black cattle using genomic information.

IF 2.5 2区农林科学 Q1 AGRICULTURE, DAIRY & ANIMAL SCIENCE

Animal Bioscience Pub Date : 2025-09-01 DOI:10.5713/ab.25.0113

Takayuki Ibi, Souma Kouno

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Abstract

Objectives: The objective of this study was to evaluate genomic inbreeding in Japanese Black cattle and its effects on reproductive traits.

Methods: The study analyzed reproductive records and SNP data from Japanese Black cattle born between 2001 and 2005, resulting in 8,553 records from large farms. Genomic inbreeding was assessed using SNP data from 782 animals. Key reproductive traits analyzed included age at first calving (AFC) and calf production index (CPI). Statistical models were employed to estimate fixed effects and inbreeding depression.

Results: Findings indicated that genomic inbreeding levels were generally higher than traditional inbreeding coefficients. Significant inbreeding depression was observed in CPI but not in AFC. Specific chromosomes (12, 15, 27 for CPI and 4 for AFC) showed significant associations with inbreeding depression. Key genes related to reproduction were identified, particularly on chromosome 15.

Conclusion: The study concludes that genomic inbreeding effectively detects inbreeding depression related to reproductive abilities in Japanese Black cattle. The results highlight the importance of genomic assessment in breeding practices to enhance reproductive performance while maintaining genetic diversity in the breed.

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利用基因组信息研究日本黑牛生殖性状近交抑制。

目的：研究日本黑牛基因组近交及其对生殖性状的影响。方法：该研究分析了2001年至2005年出生的日本黑牛的生殖记录和SNP数据，得到了来自大型农场的8,553条记录。使用来自782只动物的SNP数据评估基因组近交。主要生殖性状包括初产犊龄（AFC）和产犊指数（CPI）。采用统计模型估计固定效应和近交抑制。结果：基因组近交水平普遍高于传统近交系数。在CPI中观察到明显的近交抑制，而在AFC中没有。特定染色体（CPI为12、15、27，AFC为4）与近交抑制显著相关。鉴定了与生殖有关的关键基因，特别是在第15号染色体上。结论：基因组近交可以有效检测出与日本黑牛繁殖能力相关的近交抑制。结果强调了基因组评估在育种实践中的重要性，以提高繁殖性能，同时保持品种的遗传多样性。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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