Abstract
A total of 130 Chinese Meishan piglets were scored for their genotypes at five gene loci and five microsatellite loci. The average gene heterozygosity was 0.3338 and the average microsatellite heterozygosity was 0.2954, and the heterozygosity of the overall ten loci was 0.3146. The data of birth weight (BW) and body weight on day 35 (W35) were collected, average daily gain (ADG) for each individual was computed as the slope from the regression of weight on age. There was no significant correlation between individual heterozygosity and birth weight (p>0.05). Significant regressions were observed between ADG and the heterozygosity of loci (p<0.01). Similar results were observed in W35 and loci heterozygosity (p<0.01). Heterozygosity at these ten loci explained 43.62% of the total variation in ADG and 45.48% in W35. Significant correlations existed not only in the function of gene loci but also in neutral microsatellite loci, so it indicated that associative overdominance affected piglet growth significantly. (Asian-Aust. J. Anim. Sci. 2005.
Highlights
A total of 130 Chinese Meishan piglets were scored for their genotypes at five gene loci and five microsatellite loci
Key Words : Associative Overdominance, Heterozygosity, Growth Trait, Pig overdominance was seldom probed in the past decades
This study describes genetic responsible for most of the observed superiority of variability and the relationship between heterozygosity and heterozygotes’
Summary
Overdominance was seldom probed in the past decades. Wu et al (2001) discussed association of microsatellite genomic. Associative overdominances early growth traits in Meishan pig population, a fecund but have been observed in many aquatic species and low growth rate pig breed distributed in Yangtze River allozyme/protein markers were widely used The objectives are (1) to serve as a basis for Hansson and Westerberg, 2002) These aquatic species were future studies on the relationship among genetic variability rainbow trout (Ferguson, 1992), scallops (Grant and and growth, (2) to probe whether the association of Eleftherios, 1994), clams (Garton et al, 1984), mussels Meishan piglet growth and loci heterozygosity can be (Dichl et al, 1986), oysters (Koehn and Shumway, 1982) explained by associative overdominance.
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