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Heritabilities of and Genetic and Phenotypic Correlations among some Economically Important Traits of Beef Cattle¹

University of Hawaii, Honolulu 96822

Abstract

Data from the Hawaii Beef Cattle Improvement Association records collected over a 7-year period (1965 through 1971) were used to estimate heritabilities and genetic and phenotypic correlations involving weaning weight/day age, weaning conformation score, yearling weight/day age, average daily gain from weaning to yearling age, and yearling conformation score.

All parameters were estimated on a within-sex and within-breed basis and, subsequently, pooled across sexes within-breeds and lastly across sexes and breeds. Heritability estimates from data pooled across sexes and breeds were high and ranged from 0.44 to 0.81 indicating that relatively rapid rates of genetic change can be expected from selection pressure directed at any one of them. Phenotypic correrelations between weaning weight per day of age and weaning conformation score with average daily gain from weaning to yearling age were negative. All other phenotypic correlations were positive. Genetic correlations were, with one exception, positive and ranged from 0.11 to 0.66. The one exception is the genetic relationship between average daily gain from weaning to yearling age and yearling conformation score in which a value of –.30 was obtained.

¹ Journal Series No. 1469 of the Hawaii Agricultural Experiment Station.