Abstract
The goal of this study was to determine if there is any association between the DNA mutations in the insulin-like growth factor-1 receptor gene and litter size in Polish sows. The following reproductive traits were investigated: total number of piglets born (TNB), number of piglets born alive (NBA), and number of piglets weaned. The polymorphism in the IGF1R gene was analyzed by a PCR-RFLP method using the restriction enzymes SacII. Two different alleles of the IGF1R gene were identified. The statistical analysis in first parity showed that the BB genotype was superior and the differences were highly significant (p≤0.01). Later parities sows with the BB genotype still had the largest litter size compared to AB and AA sows, but the difference was statistically not significant. The preliminary study suggests a possibility of using the IGF1R gene polymorphisms to improvement of litter size of sows.
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