Racial Composition of Composite Bovine for Mating with Different Female Genetic Groups

Abstract Text: In the formation of the composite in study, breeds were pregrouped in: Group N, Zebu; Group A, adapted to tropical climate; Group B, British and Group C, Continental. A procedure was proposed to investigate breed proportions that maximize the predicted merit of the next generation, when sires are mated with F1 females (NxA, NxB and NxC). Proportion of different breeds in each bull was calculated from the original pedigrees. The net merit of each progeny was computed for an index that included breed values for birth weight, weaning weight, postweaning gain, scrotal circumference and muscle score. Breed compositions (medium to high B fraction, and average A fraction) of sires in mating with F1 dams, generates progeny with coefficients of heterozygosity ranging from medium to high magnitude. Some breed composition sire would be selected in any mate systems  indicating high combining ability of these compositions.

Keywords:

crossbred

heterozygous

optimization