Heritability of Growth Rate in Inbred Swine Based on a Crossbred Foundation

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Abstract
Estimates of heritability of daily gain from weaning to 140 or 154 days of age were obtained for pigs of the Minnesota No. 1, Minnesota No. 2 and Minnesota No. 3 breeds on an intra-station and intra-year basis. Estimates were computed on the basis of the intra-sire regression of offspring on dam and from gross regression of offspring on dam. Pooled estimates were obtained by both methods for each breed separately. The breed estimates did not differ significantly from each other so that they too could be pooled. The final pooled estimates were 0.14±0.10 based on intra-sire regression, and 0.28±0.06 based on gross regression. The degrees of freedom for the two estimates were 451 and 1419 respectively. The method of gross regression is suggested as a preferable method for some kinds of data. The estimate by that method is considered the better on these data. Of special interest is the fact that heritability was found to be no higher in the Minnesota No. 3 (a recent derivative from a broad genetic base) than in the other two breeds. Copyright © . .

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