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Heritability Estimates of Post-Weaning Growth to Long Yearling Age of Range Beef Heifers Raised on Grass¹

University of California, Davis

Abstract

Estimates of heritability of long yearling weight for range beef heifers raised under two different management schemes have been made. Under one plan (herd A) the heifers were supplemented to promote continuous growth during the fall and winter (post-weaning) when the range was nutritionally deficient, while heifers under the other plan (herd B) were not supplemented and almost invariably lost weight during the period in question. Both herds made good gains during the subsequent spring period of good pasture. Heritability estimates of long yearling weight were 0.44 for herd A and –.19 for herd B. Evidence is presented that the difference between these estimates is not entirely due to sampling error and an explanation is suggested for the existence of a difference in heritability of long yearling weight under the two management conditions.

¹ In cooperation with the U.S.D.A. under Western Regional Project W-1 on beef cattle breeding research.