Prior to the initiation of a selection project, foundation herds of Hereford and Angus cattle were created and their progeny evaluated during a 4-yr period (1964 to 1967) for 168-d postweaning gain on either a high- or medium-energy diet. Hereford and Angus calves receiving the high energy diet gained more (P <
.01) than their contemporaries fed the medium energy diet. Sire differences were only significant in the Angus. Sire x diet interactions were not significant in
either breed. When gain by progeny of each sire on each diet was considered as two
distinct traits, the genetic correlation between gain on the two diets was not different from 1.0 for the Angus. The genetic correlation for gain in the Herefords could not be estimated because of a negative sire variance component estimate. These results indicate that sires rank the same based on progeny performance on either diet.
Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XV. Beef cattle, sheep and pig genetics and breeding, fibre, fur and meat quality., , 307–310, 1990
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