Genetic relationships between growth traits and litter size were estimated in two dam lines from two farms. Analyses were by REML using a multiple trait animal model. Heritabilities of growth traits were moderate to high (.28 to .55) and h2 of total number bom was low (<.14) with repeatability near .20. Most genetic correlations between growth traits and total number bom were small in magnitude (<.25) and were inconsistent between lines and farms. Average daily feed intake had the largest genetic correlations with total number bom (-.25 to .20). Genetic correlations tended to be larger when only first parity litter records were included. If multiple trait evaluations are perfoimed within each line and faim, accuracy of breeding values for number bom may be increased by including growth traits. However, if average estimates are used, including growth traits would have little impact on the accuracy of evaluations for number bom since average correlations are near zero.

T. H Short, E. R Wilson, D. G McLaren

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume 17. Genetics and breeding of dairy and beef cattle, swine and horses, , 413–416, 1994
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