Inbreeding and Genetic Diversity in Three Imported Swine Breeds in China Using Pedigree Data

Autor: Li Zhu, Guoqing Tang, Yanzhi Jiang, Tianfei Liu, Zhiquan Wang, X. W. Li, Anan Jiang, Lin Bai, J. Xue, M. J. Lian, Yang Runlin, Zhiyao Zeng
Jazyk: angličtina
Rok vydání: 2013
Předmět:
Zdroj: Asian-Australasian Journal of Animal Sciences
Asian-Australasian Journal of Animal Sciences, Vol 26, Iss 6, Pp 755-765 (2013)
ISSN: 1976-5517
1011-2367
Popis: The accumulation of inbreeding and the loss of genetic diversity is a potential problem in the modern swine breeds in China. Therefore, the purpose of this study was to analyze the pedigrees of Chinese Duroc (CD), Landrace (CL) and Yorkshire (CY) swine to estimate the past and current rates of inbreeding, and to identify the main causes of genetic diversity loss. Pedigree files from CD, CL and CY containing, 4529, 16,776 and 22,600 records, respectively, were analyzed. Pedigree completeness indexes of the three breeds, accounting for one generation back, were 83.72, 93.93 and 93.59%, respectively. The estimated average annual inbreeding rates for CD, CL and CY in recent three years were 0.21, 0.19 and 0.13%, respectively. The estimated average percentage of genetic diversity loss within each breed in recent three years was about 8.92, 2.19, and 3.36%, respectively. The average relative proportion of genetic diversity loss due to unequal contributions of founders in CD, CL and CY was 69.09, 57.95 and 60.57%, and due to random genetic drift was 30.91, 42.05 and 39.43%, respectively. The estimated current effective population size for CD, CL and CY was 76, 117 and 202, respectively. Therefore, CD has been found to have lost considerable genetic diversity, demanding priority for optimizing the selection and mating to control future coancestry and inbreeding. Unequal contribution of founders was a major cause of genetic diversity loss in Chinese swine breeds and random genetic drift also showed substantial impact on the loss of diversity.
Databáze: OpenAIRE
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