Volume 14, Issue 4 (12-2023)
Res Anim Prod 2023, 14(4): 114-120 |
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Badbarin S, Khamis Abadi H, Ahmadpanah J. (2023). Pedigree Analysis and Estimation of some Population Parameters of Sanjabi Sheep at Mehrgan Station. Res Anim Prod. 14(4), 114-120. doi:10.61186/rap.14.42.114
URL: http://rap.sanru.ac.ir/article-1-1390-en.html
URL: http://rap.sanru.ac.ir/article-1-1390-en.html
1- Animal Science Department, Kermanshah Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Kermanshah, Iran
2- Animal Science Department, Ilam Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ilam, Iran
2- Animal Science Department, Ilam Agricultural and Natural Resources Research and Education Center, Agricultural Research Education and Extension Organization (AREEO), Ilam, Iran
Abstract: (942 Views)
Extended Abstract
Background: Genetic diversity determines a population's capacity to respond to selection and undergo genetic improvement. To evaluate breeding programs and make informed decisions about their continuation, assessing the genetic diversity of the population is essential. This project aimed to investigate the genetic diversity and estimate the population parameters of Sanjabi sheep based on pedigree analysis.
Methods: The information used in this study included the animal number, sire number, dam number, sex, and date of birth of 2,067 purebred sheep collected at the Mehrgan station from 2009 to 2022. Pedigree analysis was conducted on the entire population or a reference population to estimate parameters such as inbreeding coefficients, rate of inbreeding increase, effective population size, generation interval, effective number of founders, and effective number of ancestors.
Results: The generation interval and average relationship were estimated at 2.87 years and 0.43%, respectively. The average inbreeding coefficient for the entire population was calculated at 0.48%, indicating a low level of inbreeding. However, the trend of inbreeding changes over the studied years was unfavorable. The effective population size was estimated to be 260.86, based on the increase in individual inbreeding and the maximum number of generations method. The effective size of the founders was estimated at 272.60, indicating balanced participation of the base population in reproduction. The effective number of founder individuals (fe) and the effective number of ancestors (fa) were found to be 109 and 100, respectively. The fe/fa ratio was calculated as 1.09, suggesting a low effect of genetic bottlenecks. Notably, 50% of the total genetic diversity was attributed to 38 ancestor individuals, highlighting their balanced contribution to the genetic diversity of the next generation.
Conclusion: The results indicate that, despite the small and closed nature of the population, there is relatively high genetic diversity among individuals. Since the loss of genetic diversity and the increase in homozygosity can lead to decreased production performance, it is crucial to prevent further reductions in genetic diversity and mitigate its adverse effects by continuously monitoring genetic diversity and making informed decisions to preserve it.
Methods: The information used in this study included the animal number, sire number, dam number, sex, and date of birth of 2,067 purebred sheep collected at the Mehrgan station from 2009 to 2022. Pedigree analysis was conducted on the entire population or a reference population to estimate parameters such as inbreeding coefficients, rate of inbreeding increase, effective population size, generation interval, effective number of founders, and effective number of ancestors.
Results: The generation interval and average relationship were estimated at 2.87 years and 0.43%, respectively. The average inbreeding coefficient for the entire population was calculated at 0.48%, indicating a low level of inbreeding. However, the trend of inbreeding changes over the studied years was unfavorable. The effective population size was estimated to be 260.86, based on the increase in individual inbreeding and the maximum number of generations method. The effective size of the founders was estimated at 272.60, indicating balanced participation of the base population in reproduction. The effective number of founder individuals (fe) and the effective number of ancestors (fa) were found to be 109 and 100, respectively. The fe/fa ratio was calculated as 1.09, suggesting a low effect of genetic bottlenecks. Notably, 50% of the total genetic diversity was attributed to 38 ancestor individuals, highlighting their balanced contribution to the genetic diversity of the next generation.
Conclusion: The results indicate that, despite the small and closed nature of the population, there is relatively high genetic diversity among individuals. Since the loss of genetic diversity and the increase in homozygosity can lead to decreased production performance, it is crucial to prevent further reductions in genetic diversity and mitigate its adverse effects by continuously monitoring genetic diversity and making informed decisions to preserve it.
Type of Study: Research |
Subject:
ژنتیک و اصلاح نژاد دام
Received: 2023/05/21 | Accepted: 2023/09/13
Received: 2023/05/21 | Accepted: 2023/09/13
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