| Correlation of Individual Heterozygosity of Microsatellite Marker Loci with Heterosis of Growth Traits in Pig Populations |
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| 作者姓名： | ZHANG Jing-hu XIONG Yuan-zhu DENG Chang-yan JIANG Si-wen LEI Ming-gang LI Jia-lian LI Feng-e ZHENG Rong |
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| 作者单位： | [1]Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture/College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R.China [2]Department of Biology Science ＆ Technology, Zhangzhou Teachers College, Zhangzhou 363000, P.R.China |
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| 基金项目： | 国家重点基础研究发展计划(973计划);国家高技术研究发展计划(863计划);国家自然科学基金 |
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| 摘 要： | To investigate the correlation of individual heterozygosity and heterosis of three traits in crossbred F1 pig populations, the F1 populations were built by random mating Yorkshire x Meishan （YM, n = 82）, and its reciprocal （MY, n =47） and two straightbred populations （Yorkshire = 34, Meishan = 55） were used as control groups. The heterosis of birth weight （BWT）, average daily gain （ADG）, and feed conversion ratio （FCR） were acquired as well. In the research, the significant marker loci for the heterosis of the three traits were observed by one-way ANOVA （P〈0.01） in a total of 39 marker loci on SSC4, SSC6, SSC7, SSC8, and SSC13, and the numbers of the significant marker loci were 12 （BWT）, 18 （ADG）, and 17 （FCR）, respectively, based on which the general heterozygosity （GH） was divided into significant marker loci heterozygosity （SH） and insignificant marker loci heterozygosity （IH）. Furthermore, the trends of alteration in heterosis with the stepwise increase in heterozygosity by 0.05 were explored. This was done by the regression analysis of the three kinds of heterozygosity against heterosis of the three traits. The results showed that, for BWT, the heterosis increased with the increase in GH （r=0.9337, P=0.0021） and SH （r=0.9165, P=0.0102）; for ADG, the heterosis increased with the increase in IH （r=0.7012, P=0.0353） and GH （r=0.7470, P=0.0537, near significant）; for FCR, the heterosis of feed efficiency increased with the increase in IH （r=0.8721, P=0.0022）. The results indicated that the correlation was not always higher or more significant for SH with heterosis than it was for IH or GH with heterosis, and it might be because of the reciprocal cancellation of the positive effect and negative effect of QTL linked to the significant marker loci.
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| 关 键 词： | 猪 杂种优势 分子标记 杂合性 |
| 收稿时间： | 2006-01-17 |
| 修稿时间： | 2006-06-08 |
Correlation of Individual Heterozygosity of Microsatellite Marker Loci with Heterosis of Growth Traits in Pig Populations |
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| ZHANG Jing-hu XIONG Yuan-zhu DENG Chang-yan JIANG Si-wen LEI Ming-gang LI Jia-lian LI Feng-e ZHENG Rong.Correlation of Individual Heterozygosity of Microsatellite Marker Loci with Heterosis of Growth Traits in Pig Populations[J].Agricultural Sciences in China,2006,5(8):635-642. |
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| Authors: | ZHANG Jing-hu XIONG Yuan-zhu DENG Chang-yan JIANG Si-wen LEI Ming-gang LI Jia-lian LI Feng-e ZHENG Rong |
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| Institution: | 1. Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture/College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China;Department of Biology Science & Technology, Zhangzhou Teachers College, Zhangzhou 363000, P.R. China
2. Key Laboratory of Swine Genetics and Breeding, Ministry of Agriculture/College of Animal Science and Veterinary Medicine, Huazhong Agricultural University, Wuhan 430070, P.R. China |
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| Abstract: | To investigate the correlation of individual heterozygosity and heterosis of three traits in crossbred F1 pig populations, the F1 populations were built by random mating Yorkshire × Meishan (YM, n = 82), and its reciprocal (MY, n = 47) and two straightbred populations (Yorkshire = 34, Meishan = 55) were used as control groups. The heterosis of birth weight (BWT), average daily gain (ADG), and feed conversion ratio (FCR) were acquired as well. In the research, the significant marker loci for the heterosis of the three traits were observed by one-way ANOVA (P<0.01) in a total of 39 marker loci on SSC4, SSC6, SSC7, SSC8, and SSC13, and the numbers of the significant marker loci were 12 (BWT), 18 (ADG), and 17 (FCR), respectively, based on which the general heterozygosity (GH) was divided into significant marker loci heterozygosity (SH) and insignificant marker loci heterozygosity (IH). Furthermore, the trends of alteration in heterosis with the stepwise increase in heterozygosity by 0.05 were explored. This was done by the regression analysis of the three kinds of heterozygosity against heterosis of the three traits. The results showed that, for BWT, the heterosis increased with the increase in GH (r=0.9337, P=0.0021) and SH (r=0.9165, P=0.0102); for ADG, the heterosis increased with the increase in IH (r=0.7012, P=0.0353) and GH (r=0.7470, P=0.0537, near significant); for FCR, the heterosis of feed efficiency increased with the increase in IH (r=0.8721, P=0.0022). The results indicated that the correlation was not always higher or more significant for SH with heterosis than it was for IH or GH with heterosis, and it might be because of the reciprocal cancellation of the positive effect and negative effect of QTL linked to the significant marker loci. |
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| Keywords: | pig heterosis microsatellite marker individual heterozygosity |
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