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Relationship between climatic factors and wannanhua sow's reproductivity

Ying, Z.; Chen, H.

Ying Yong Sheng Tai Xue Bao 13(10): 1311-1314

2002

ISSN/ISBN: 1001-9332
PMID: 12557683
Document Number: 551854
Data on reproductive traits of 670 litters of different Am genotypes Wannanhua sow under different climatic conditions were analyzed by the least square model in order to investigate the effects of the climate factors and the Am genotypes on sow's reproductivity. The results showed that the reproductive performance of sow depended on the monthly change of climate regularly. High temperature from July to September had worse effect on sow's reproductivity, especially (P < 0.05). A certain variation existed among reproductive performances of Wannanhua sows at Am loci. AmAB's was better, followed by AmAA, then AmBB and AmBC were poor. But the variance was in significant (P > 0.05). Furthermore, there was strong interactive effect between Am genotypes and the breeding season. In addition, the litter size, the number of live born and the number of weaning pig had a negative correlation with the mean air temperature and photoperiod significantly (P < 0.05 or P < 0.01).

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