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Testing Dairy Bulls under the Penkeeping System in Brazil¹

Departamento da Producao Animal, Secretaria da Agricultura, Belo Horizonte, Minas Gerais, Brazil

ABSTRACT

Grade dairy sires have been used extensively in the dairy regions of Minas Gerais, Brazil, where milk is produced under the penkeeping system. Data from one of these herds showed 0.41 for the repeatability of single records and 0.23 for the heritability of differences in single records of milk yield. These values are similar to those reported in the temperate regions under a widely different kind of management. Variance within and between the 27 sires indicated a correlation of 0.19 between paternal half sisters but may have contained something from common environment and time trends.

Variation in the sire indexes did not seem related to the fraction of imported blood. Individual genotypic differences seemed more important than the amount of exogenous blood.

¹ The writer is indebted to Dr. Jay L. Lush for guidance and assistance during the course of this study.