Genetic Parameters for Reproduction Traits of Prolificacy and Conventional Purebred Sows
Keywords:
Genetic parameters, pigs, reproduction traitsAbstract
Research was performed on four farms were included in 1567 a highly fertile females Landrace and Yorkshire, and 24 boars of Danish origin, or 5294 consecutive parities, and in period 2009 - 2011 year. Studies of evaluations genetic parameters conventional breeds Landrace and Yorkshire were included in 2987 female mating with 46 male or 11 674 litters in the same period. Evaluated genetic parameters for litter size traits show the same tendency as the legality of the pure breed sows that produce 11-14 piglets weaned less per sow per year. Environmental factors, HYS, food technology and management showed no significant effect on the traits. Heritability and repeatability of live and still born piglets, litter size and the fifth days after birth and the number of piglets weaned in category of low hereditary traits whose values vary within the limits of 0.08 to 0.11 for the heritability and from 0.14 to 0.18 for the repeatability. There was tendency to lower values of genetic parameters in the conventional compared to highly fertile cows, which is considered the effect of selection on gene frequency for the observed properties.
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