GENETIC-PARAMETERS AND CONSEQUENCES OF SELECTION FOR GROWTH TRAITS IN A BEEF HERD SELECTED FOR YEARLING WEIGHT

被引:11
作者
ALENDA, R [1 ]
MARTIN, TG [1 ]
机构
[1] PURDUE UNIV, W LAFAYETTE, IN 47907 USA
关键词
D O I
10.2527/jas1987.642366x
中图分类号
S8 [畜牧、 动物医学、狩猎、蚕、蜂];
学科分类号
0905 ;
摘要
Data from 2,576 calves produced in a single Angus herd were analyzed to obtain estimates of heritability, genetic and phenotypic correlations, and cow performances repeatabilities. Traits analyzed were birth weight (BWT), 205-d weight (WWT), 365-d weight (YWT), postweaning gain (PWG) and gain from birth to 365 d (PBG) in the male and female data sets. Heritabilities and correlations were higher in the male data set than in the female set. Heritabilities estimated by intraclass correlation from the male and female data sets, respectively, were .51 and .41 for BWT; .30 and .21 for WWT; .36 and .18 for YWT; .38 and .27 for PWG; and .34 and .18 for PBG. Genetic correlations were consistently smaller in female data than in male data. Genetic correlations were consistently smaller in female data than in male data. Genetic correlations ranged from .37 between WWT and PWG to .99 between YWT and PBG in the male data, and from .10 between BWT and PWG to .99 between YWT and PBG in the female data. Repeatibilities of calf weights and gains as traits of the dam were estimated by dam components of variance. The estimated repeatibilities for male and female data sets, respectively, were .26 and .29 for BWT; .43 and .28 for WWT; .21 and .48 for YWT; .05 and .75 for PWG; and .20 and .49 for PBG. Expected changes in YWT were 15.18 or 14.67 kg per generation, respectively, when either YWT or PBG was the sole criterion of selection. Genetic change in YWT was reduced by 31 to 47% when using a selection index that was constructed to produce zero change in birth weight.
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页码:366 / 372
页数:7
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