Abstract

Heritabilities and correlation between litter size and litter weight at birth were estimated from paternal half-sib analyses on the basis of the data from 2,156 litters of purebred Landraces, Yorkshires, Durocs and Hampshires. Heritabilities of litter size at birth estimated were .20 + .09 for Landraces, .25 + .12 for Yorkshires, .04 + .09 for Durocs and .12 + .10 for Hampshires. Heritabilities of litter weight at birth estimated were .32 + .11 for Landraces, .32 + .13 for Yorkshires, .23 + .13 for Durocs and .09+.10 for Hampshires. Genetic and phenotypic correlations between litter size at birth and litter weight at birth were positive and very high in all of the breeds.
 

Y. I Park, J. B Kim

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume X. Breeding programs for swine, poultry, and fish., , 59–62, 1986