Estimation of Additive and Dominance Genetic Variances in Selected Layer Lines
نویسندگان
چکیده
منابع مشابه
Variances of additive and dominance genetic effects for ovulation and twinning rates in a population selected for twinning.
Estimates of variances due to additive and dominance genetic effects and permanent and temporary environmental effects were obtained for ovulation and twinning rates from a composite population selected for twinning rate. Measures of ovulation rate after 11 mo of age on 2,317 heifers with a total of 19,209 measures were used. Twinning measures were on 1,522 first-parity cows, 1,311 later-parity...
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Dominance and additive x additive genetic variances were estimated for birth and weaning traits of calves from three synthetic lines of beef cattle differing in mature size. Data consisted of 3,992 and 2,877 records from lines of small-, medium-, and large-framed calves in each of two research herds located at Rhodes and McNay, IA, respectively. Variance components were estimated separately by ...
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HE dominant favorable gene hypothesis, first proposed by BRUCE (1910), T attributes heterosis to accumulated effects of loci at which the more favorable allele contributed by one parent is manifest rather than the unfavorable allele contributed by the other parent. The concepts of linkage (JONES 191 7) and large number of loci (COLLINS 1921; SINGLETON 1941) make the hypothesis compatible with t...
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A population of size 40 was simulated 1,000 times for 10 generations. Five out of twenty males were selected each generation, and each male was mated to four females to have two progeny. The additive genetic variance (sigma 2a) before selection was 10, and the initial heritability was .5. Due to covariances among animals, inbreeding and gametic disequilibrium, the genetic variance was reduced t...
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ژورنال
عنوان ژورنال: Nihon Chikusan Gakkaiho
سال: 2000
ISSN: 1346-907X,1880-8255
DOI: 10.2508/chikusan.71.454