Effect of including relationships in the estimation of genetic parameters of beef calves
Article Abstract:
The influence of kinship on the estimation of calf birth weight, weight gain from parturition to weaning and weight on the 205th day was evaluated to determine the necessity of including the relationship matrix in genetic parameter estimation. Variances of the different factors affecting the calves' genotype and phenotype were calculated with and without the numerator relationship matrix factor in separate herds of Angus and Hereford cattle. Analysis of the variances indicated that in some cases, it was not necessary to include the kinship factor in the approximation of genetic parameters.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Estimates of repeatability and heritability of horn fly resistance in beef cattle
Article Abstract:
Heritability estimates for horn fly resistance in cattle were found to indicate the involvement of additive gene action. A moderately high overall repeatability estimate of .47 .05 supports that contention. Breed effects contributed a substantial amount of the variation in resistance, followed by sire/breed interaction, then residual error. Selection for horn fly resistance is therefore possible, although no physiological indicator of resistance has been found at present.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
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Estimation of direct and maternal heritability and genetic correlation for backfat and growth rate in swine using data from centrally tested Yorkshire boars
Article Abstract:
Data from centrally tested Yorkshire boars were used to estimate direct and maternal heritability and its genetic correlation with backfat and growth rate of swines. There is a moderate heritability for weight gain and high heritability for backfat. Simultaneous selection of both traits is effective in choosing superior boars from the population tested. Maternal effects were also found to be significant and must be considered to attain accurate breeding value estimates.
Publication Name: Journal of Animal Science
Subject: Zoology and wildlife conservation
ISSN: 0021-8812
Year: 1992
User Contributions:
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