Objective:
Evaluate the influence of breed and breed-type on heterosis, breed, and economic effects in cows developed with Romosinuano (tropical Bos taurus), Angus (temperate Bos taurus), and Brahman (tropical Bos indicus) breeds.

Approach:
Matings of Romosinuano, Brahman, and Angus bulls and cows produced calves in nine breed groups, including three purebreds and six F1 groups (reciprocals considered as distinct groups). Heifers were retained to form a ‘Diallel’ crossbreeding herd. Data from the weaning and post-weaning records will be analyzed for genetic traits, and expected progeny differences (EPD) will be calculated for economically important traits. Also, economic analysis of the EPDs will be evaluated to provide a means to identify individual animals suitable for use as seedstock material in the development of composite breeds suitable for tropical and subtropical beef producing regions.