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Journal of Dairy Science Vol. 75 No. 9 2541-2548
© 1992 by American Dairy Science Association ®
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Genetic Analysis of Fertility Traits in Israeli Holsteins by Linear and Threshold Models

J. I. Weller 1 and M. Ron 1

1 Institute of Animal Sciences, Agricultural Research Organization, The Volcani Center, Bet Dagan 50250, Israel

Conception rates of Israeli Holstein cows and heifers were analyzed separately by linear and threshold models. Fixed effects for both data files were insemination number, AI institute, geographical region, and calendar month. Analysis of cows also included the fixed effects of parity, calving status, and DIM at insemination. Random effects included in the models were herd-year-season, insemination technician, sire of cow, and service sire. Fixed effect solutions for heifers and cows were not similar. For cows, insemination month had the greatest effect on conception rate. Heritability of conception rate ranged from 2 to 3.5% for heifers and from 1 to 2% for cows. Correlations between corresponding threshold and linear model random effect solutions were all >9 9. Correlations between heifer and cow analyses for sire and service sire solutions were <.4. Analysis with an incorrect herd-year-season variance component affected only the technician solutions.

Key Words: genetic analysis • fertility • threshold model • Israeli Holsteins

Submitted on January 15, 1992
Accepted on May 20, 1992




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