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Journal of Dairy Science Vol. 77 No. 3 867-873
© 1994 by American Dairy Science Association ®
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Genetic Parameters for Yield and Reproductive Traits of Holstein and Jersey Cattle in Florida

M. S. Campos 1, C. J. Wilcox 1, C. M. Becerril 1, and A. Diz 1

1 Dairy Science Department, University of Florida, Gainesville 32611

Records of yield and reproduction from 4293 Holstein and 2143 Jersey first lactation cows from eight Holstein and six Jersey herds were utilized to evaluate genetic parameters for Florida, a subtropical environment. Statistical analyses were by derivative-free REML with the animal model. Genetic variances were based on variation in estimated breeding values of individual cows. Heritabilities were .27 to .43 for yields (6 estimates), .38 to .51 for constituent percentages (4 estimates), and .025 to .056 for reproduction (6 estimates), which were similar to estimates for temperate areas from similar procedures. Also, correlations of breeding values between yields were high and between yields and reproduction were low and generally antagonistic. Correlated responses in calving interval from selection for yield, with selection intensities of 1.0 to 1.5, would be expected to lead to increases of 1.0 to 5.2 d per generation (12 estimates). Thus, estimates of genetic parameters and correlated responses in this subtropical environment did not differ appreciably from those that occur in temperate dairy areas.

Key Words: Florida • production • reproduction • genetic parameters

Submitted on April 12, 1993
Accepted on October 18, 1993




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