J. Anim Sci.
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J. Anim Sci. 1982. 55:1310-1318.
© 1982 American Society of Animal Science
This Article
Right arrow Full Text (PDF)
Right arrow Alert me when this article is cited
Right arrow Alert me if a correction is posted
Services
Right arrow Similar articles in this journal
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Right arrow reprints & permissions
Citing Articles
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Kock, R. M.
Right arrow Articles by Gregory, K. E.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Kock, R. M.
Right arrow Articles by Gregory, K. E.

Influence of Postweaning Gain Interval on Estimates of Heritability and Genetic Correlations1

R. M. Kock2, L. V. Cundiff3 and K. E. Gregory3

University of Nebraska, Lincoln 68583 and and US Department of Agriculture, Clay Center, NE 68933

Abstract

Heritability and phenotypic environmental and genetic correlations of postweaning gains for intervals of 28 to 224 d were calculated from data on 2,410 crossbred steers and 3,088 Hereford bulls. Gains were essentially linear for the 224-d interval. As the length of the performance interval increased from 28 to 224 d, heritability of gain increased from .12 to .55 among the crossbred steers and from .09 to .24 among the Hereford bulls. There was no tendency for heritability to be larger or smaller for intervals of like duration initiated early or late in the 224-d interval. Heritability of individual animal regressions of weight on days was evaluated as an alternative measure of gain/d. Heritabilities were not different between daily gain and regressions when measured over the same intervals. Genetic correlations were generally positive and much larger than the environmental or phenotypic correlations, indicating that genetic influences tended to persist from one interval to another. Genetic correlations between intervals tended to become smaller as the number of days separating the intervals increased.

Footnotes

1 Published as Paper No. 6734 Journal Ser., Nebraska Agr. Exp. Sta., Lincoln and contribution from Regional Project NC-1, Improvement of Beef Cattle Through Breeding Methods.

2 Anim. Sci. Dept., Univ. of Nebraska, Roman L. Hruska U.S. Meat Anim. Res. Center, Clay Center 68933.

3 Roman L. Hruska U.S. Meat Anim. Res. Center, USDA, SEA-ARS, Clay, NE.






HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Copyright © 1982 by the American Society of Animal Science.