Evaluation of the effect and profitability of gene-assisted selection in pig breeding system |
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| Authors: | Li Ya-lan Zhang Qin Chen Yao-sheng |
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| Institution: | (1) College of Animal Science, South China Agricultural University, Guangzhou, 510642, China;(2) College of Animal Science and Technology, China Agricultural University, Beijing, 10094, China;(3) College of Life Science, Sun Yat-sen University, Guangzhou, 510275, China |
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| Abstract: | Objective: To evaluate the effect and profitability of using the quantitative trait loci (QTL)-linked direct marker (DR marker)
in gene-assisted selection (GAS). Methods: Three populations (100, 200, or 300 sows plus 10 boars within each group) with
segregating QTL were simulated stochastically. Five economic traits were investigated, including number of born alive (NBA),
average daily gain to 100 kg body weight (ADG), feed conversion ratio (FCR), back fat at 100 kg body weight (BF) and intramuscular
fat (IMF). Selection was based on the estimated breeding value (EBV) of each trait. The starting frequencies of the QTL’s
favorable allele were 0.1, 0.3 and 0.5, respectively. The economic return was calculated by gene flow method. Results: The
selection efficiency was higher than 100% when DR markers were used in GAS for 5 traits. The selection efficiency for NBA
was the highest, and the lowest was for ADG whose QTL had the lowest variance. The mixed model applied DR markers and obtained
higher extra genetic gain and extra economic returns. We also found that the lower the frequency of the favorable allele of
the QTL, the higher the extra return obtained. Conclusion: GAS is an effective selection scheme to increase the genetic gain
and the economic returns in pig breeding.
Project (No. 30300249) supported by the Natural Science Foundation of Guangdong Province, China |
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| Keywords: | Swine Gene-assisted selection (GAS) Selection efficiency Extra returns |
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