On a long-term study, where the selection criterion was superior post- weaning gain, one line of each of the Angus and Hereford breeds was fed an 80% concentrate:20% roughage diet and the second line of each breed was fed a roughage diet. After 12 years of selection, progress was measured by comparing the progeny of selected bulls with those of foundation bulls. Significant progress was made for postweaning gain in both breeds, particularly on the concentrate diet. In the Angus, the advantage carried through to weight-per- day-of-age to end of test and final feedlot weight. Birth weights of selected Hereford lines had declined. Angus cows selected on the roughage diet had a significantly higher yield of milk, fat, solids-not-fat and protein than those tested on the concentrate diet. The trend was similar in the Herefords.

D. RC Bailey, J. E Lawson

Proceedings of the World Congress on Genetics Applied to Livestock Production, Volume XII. Biotechnology, selection experiments, parameter estimation, design of breeding systems, management of genetic resources., , 210–214, 1986
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