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Relationship of Dystocia Transmitting Ability with Type and Production Transmitting Ability in Holstein Bulls¹

Department of Animal Science, Iowa State University, Ames 50011

ABSTRACT

Relationships of transmitting ability for dystocia with transmitting abilities for type and production in Holstein bulls were estimated. Genetic correlations between dystocia transmitting ability with Predicted Difference (PD) were: milk .00, fat .00, test –.02, and dollars .00. Genetic correlations for transmitting ability of dystocia were –.28 with Predicted Difference Type and –.23 with Type Production Index. Correlations indicated improved conformation will increase dystocia. The relationship of transmitting abilities from Mating Appraisal for Profit with dystocia indicated that scale (size) has a major effect on the type-dystocia relationship. Large size results in both high type classification and increased dystocia. Correlations of rump and center support with dystocia were also in excess of .20.

¹ Journal Paper No. J-9695 of the Iowa Agriculture and Home Economics Experiment Station, Ames. Project No. 1053.