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Journal of Dairy Science Vol. 61 No. 9 1250-1256
© 1978 by American Dairy Science Association ®
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Phenotypic and Genetic Relationships between Type Classification Traits in Jerseys

H. D. Norman, B. G. Cassell and F. N. Dickinson

Animal Improvement Programs Laboratory, Federal Research, Science and Education Administration, U. S. Department of Agriculture, Beltsville, MD 20705

E. E. Wright

American Jersey Cattle Club, P. O. Box 27310 Columbus, OH 43227

ABSTRACT

Heritabilities were estimated for 15 American Jersey Cattle Club type traits from 4539 daughter-dam pairs. Estimates for final score, general appearance, dairy character, body capacity, and mammary system were .23, .19, .20, .14, and .26. Stature had the highest heritability at .43. Heritabilities for legs, suspensory ligament, and breed character were lowest at .09, .11, and .12.

Genetic correlations were positive between most type traits. Final score was correlated highly genetically with major categories general appearance, dairy character, body capacity, and mammary system at .79, .56, .58, and .84, and with the other subtraits (.51 to .81). Therefore, selection for improvement in final score should enhance all traits in the type classification program.

Phenotypic correlations were positive between all pairs of traits. Final score was correlated with major categories general appearance, dairy character, body capacity, and mammary system .72, .52, .48, and .69. Final score was correlated .37 to .60 with the other components. General appearance and mammary system received more emphasis than specified on the Purebred Dairy Cattle Association's official scorecard.






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Copyright © 1978 by the American Dairy Science Association ®.