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