A deterministic simulation model was dev/eloped to predict % heterozygosity, breeding values and expected phenotypes in conjunction with an innovative beef cattle breeding program utilizing composite sires. CASH (23% Hereford, 23% Angus, 34% Broun Swiss, 20% Charolais), RX3 (25% Hereford, 25% Red Holstein, 50% Red Angus), and MARC III (25% each of Hereford, Angus, Red Poll and Pinzgauer) were mated to Hereford cows with MARC III bulls being used on heifers only and mature cows being mated to the least related of CASH and RX3. The model records each mating and characterizes progeny by the percent blood from each of their contributing foundation breeds. Individual and maternal heterozygosity values, relative to F1 values, were summarized by year for fifteen years. Breeding values for individual animals were estimated from breed means of foundation animals weighted by percent of each breed. Estimated heterosis values were combined with breeding values to obtain expected phenotypic values of progeny .
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., , 345–350, 1986
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