| Life Sciences & Biotechnology |
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| Crossbreeding parameters for fertility traits in a rotational crossbreeding between Landrace and Piétrain pigs |
| CHEN Hai-yan, FU Yan, NIU Dong, RUAN Hui |
| Animal Science College, Zhejiang University, Hangzhou 310029, China; Lishui Teachers College, Lishui 323000, Zhejiang, China; Agricultural Engineering & Food Science College, Zhejiang University, Hangzhou 310029, China |
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Abstract The reproduction characteristics of 343 sows in six different breeding groups were analyzed to estimate the crossbreeding parameters. The results indicated that the ovulation rate and the weights of uterus and ovary are mainly determined by the additive genetic effects while the nonadditive genetic effects play an important role in embryonal traits and litter performance. The heterosis effects in the first litter are larger than those in the second litter because of heterosis x environment interaction. The results also showed the existence of a highly significant maternal heterosis effect on the fertility traits of sows.
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Received: 06 June 2001
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