Department of Biotechnology, Yeungnam University, Gyeongsan, Gyeongbuk 38541, South Korea.
Jung P&C Institute, Inc. Yongin 16950, South Korea.
Poult Sci. 2024 Oct;103(10):104071. doi: 10.1016/j.psj.2024.104071. Epub 2024 Jul 15.
This study assessed the trends in inbreeding, effective population size, and genetic diversity across six Korean native chicken lines using pedigree records from 54,383 chickens. Understanding these genetic parameters is significantly important for maintaining healthy and viable chicken populations. The primary objective was to analyze the pedigree data to assess the levels of inbreeding and genetic diversity and to evaluate the effective population size across the different lines. Pedigree analysis revealed that pedigree completeness peaked in the first generation and declined in subsequent generations for all lines. Line A exhibited a mean inbreeding coefficient of 0.0201, whereas the other lines displayed lower mean values ranging from 0.0009 to 0.0098, indicating that inbreeding levels were within an acceptable range and considered safe from extinction. Average relatedness consistently increased with time. Individual increases in inbreeding were the highest in Line A (0.62%), with smaller increases in the other lines ranging from 0.02 to 0.23%. Effective population sizes varied from 81 to 2500, with average coancestry within parental populations ranging from 0.0032 to 0.0290. The f/f ratio between 1.00 and 1.69 in the 6 lines suggested a moderate impact during bottleneck events, with subsequent populations recovering well. The genetic diversity loss due to genetic drift and unequal founder contributions ranged from 0.66-3.15%, indicating that considerable genetic variability remains within the populations. The results of this study have practical applications in the management and conservation of genetic resources in poultry breeding programs. By highlighting the importance of monitoring inbreeding and maintaining genetic diversity, the findings can help develop strategies to ensure the long-term sustainability of these chicken lines. This study provides valuable insights into the genetic management of Korean native chicken lines, emphasizing the need for strategic breeding practices to preserve genetic health and diversity.
本研究利用来自 54383 只鸡的系谱记录，评估了六个韩国本土鸡系的近交系数、有效种群大小和遗传多样性趋势。了解这些遗传参数对于维持健康和有活力的鸡群非常重要。主要目的是分析系谱数据，评估不同系的近交程度和遗传多样性水平，并评估有效种群大小。系谱分析表明，所有系的系谱完整性在第一代达到峰值，随后在后代中下降。A 系的平均近交系数为 0.0201，而其他系的平均近交系数较低，范围在 0.0009 至 0.0098 之间，表明近交水平在可接受范围内，并且认为不会灭绝。平均亲缘关系随时间持续增加。A 系的个体近交增加最高（0.62%），其他系的增加较小，范围在 0.02 至 0.23%之间。有效种群大小从 81 到 2500 不等，父母群体内的平均亲缘关系从 0.0032 到 0.0290 不等。6 个系的 f/f 比值在 1.00 到 1.69 之间，表明瓶颈事件期间存在中等影响，随后的种群恢复良好。遗传漂变和不等的奠基者贡献导致的遗传多样性损失范围为 0.66-3.15%，表明种群内仍存在相当大的遗传变异性。本研究的结果在家禽育种计划的遗传资源管理和保护中具有实际应用价值。通过强调监测近交和维持遗传多样性的重要性，这些发现可以帮助制定战略，以确保这些鸡系的长期可持续性。本研究为韩国本土鸡系的遗传管理提供了有价值的见解，强调了战略育种实践对于保护遗传健康和多样性的必要性。
