Abstract
The polymorphism of insulin-like growth factor-I (IGF-I) in 13 pig breeds (total n=559) was detected by PCR-Hha I- RFLP, and allele A (151 bp and 28 bp) or allele B (116 bp, 35 bp and 28 bp) were observed. In these pig breeds, it was found that European pig breeds carried high frequencies of allele B, while Chinese native pig breeds carried high frequencies of allele A. Meanwhile the role of porcine IGF-I was investigated in 117 Nanchang White pigs and 360 Large Yorkshire pigs. Eight traits about growth and carcass were recorded for analyzing the associations between IGF-I gene polymorphism and performance quantitative traits. In the Nanchang White pigs, those with AA genotype generally had higher birth weight than those with AB genotype (p<0.05), but all these genotypes had no significant effect on the other traits which had been analyzed. In Large Yorkshire pigs, those with BB genotype had higher 2 months and 6 months body weight than those with AA genotype (p<0.05), and had a thicker hind-back-fat thickness and mid-back-thickness than those with AB and BB genotypes (p<0.05). And those with BB genotype were the thinnest in Large Yorkshire. Furthermore, pigs with AA genotype had a lower lean percentage than those with AB and BB genotypes (p<0.01), and the lean percentage of those with BB genotype was the highest. Based on these results, it is possible to make the IGF-Ⅰgene locus into the application of marker-assisted selection programmes. (Asian-Aust. J. Anim. Sci. 2002. Vol 15, No. 10 : 1391-1394)
Highlights
In this study we investigated the polymorphism of insulin-like growth factor-I (IGF-I) in 13 pig breeds and the effects of one IGF-I restrictionGrowth rate and body composition are two important fragment length polymorphism (RFLP) described by Fang characteristics in livestock production
In this study we investigated the polymorphism of IGF-I
Important economic traits are usually controlled by They were Landrace (n=65, Dongxiang County Pig Farm many genes and modified by environment factors, such as and JAU Pig Breeding), Duroc
Summary
Growth rate and body composition are two important fragment length polymorphism (RFLP) described by Fang characteristics in livestock production. Swine production et al (1999) on performance traits in Nanchang White pigs demands high growth rate and high lean percentage, and Large Yorkshire pigs. In Nanchang White pigs, birth weight was significantly associated with IGF-I genotypes. As far as corrected back-fat thickness and average back-fat thickness were concerned, pigs with BB genotype were the thinnest, no significant difference was observed. In Large Yorkshire pigs, no significant difference was observed among three genotypes for birth weight, but the birth weight of the pigs with AA genotype was the highest, this was the same as Nanchang White pigs. For 4 months body weight, no significant difference was observed among three genotypes. Pigs with BB and AB genotypes had higher lean content than AA genotype (p
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