Graduate Thesis Or Dissertation
 

Genetic components of genetic influence on traits of purebred and crossbred populations of swine of Berkshire and Yorkshire origin

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  • Purebred and crossbred litters of Yorkshire and Berkshire breeds of swine were evaluated for number of piglets born alive per litter, number of piglets weaned per litter, mean piglet birth weight, mean piglet birth weight adjusted for number of piglets born alive per litter and mean piglet weaning weight. The 632 litters, adjusted to a sow equivalent, were weaned at 56 days. The data were subjected to two analyses; the first calculates paternal, maternal and litter heterosis as the difference between crossbred and purebred means. The second analysis calculates estimates using an additive-dominance model and an epistatic model; model and scale are tested for appropriateness. In the first analysis, litter heterosis estimates tend to be positive, to range between 5% and 11%, and are similar to estimates in the literature. Maternal heterosis estimates are positive for number born and weaned, zero for birth weight and negative for weaning weight. Except weaning weight, these are similar to estimates in the literature. Paternal heterosis estimates are negative for number born and weaning weight and positive for number weaned and birth weight. In the second analysis, which uses both nontransformed and log base 10 transformed data, the additive-dominance model is not appropriate for any trait with nontransformed or transformed scales; estimates are similar to these of the first analysis. The appropriate model is the epistatic model for all traits; the nontransformed scale is appropriate for birth weight adjusted for number born and the transformed scale is appropriate for number born, number weaned, weaning weight and birth weight adjusted for number born. Parameter estimates attaining statistical significance for number born are the mean, maternal additive, paternal dominance, litter dominance, and the litter additive X additive epistatic interaction. For number weaned, significant parameter estimates are the mean, maternal additive, paternal dominance, litter dominance, and litter additive X additive. For birth weight unadjusted for number born, significant estimates are the mean, maternal additive, paternal dominance, and maternal additive X additive; no parameters are significant for birth weight adjusted for number born, Significant estimates for weaning weight are mean, litter additive, maternal dominance, and maternal dominance X dominance. Differences between estimates for the first analysis and the second analysis are large for some estimates of heterosis.
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file details BellattyPaulT1987.pdf 2017-08-22 Pubblico Scaricare