A farm-level comparison of health disorders and reproductive performance in Holstein-Gyr and Holstein dairy cows.

Holstein-Gyr crossbred dairy cows are commonly used in Central and South American countries to combine the perceived benefits of heat and health disorders tolerance of Gyr cows with the milk production of Holstein cows. The objectives of this study were to compare the incidence of health disorders and reproductive performance in Holstein-Gyr and Holstein cows managed and housed identically in a single herd. The animals were followed up to 300 days in milk, and health and reproductive data were retrieved from farm records.