What question did this study set out to answer?

To estimate heritabilities, genetic and environmental correlations, and selection responses for preweaning and weaning traits in range-raised Hereford cattle.

May 1, 1964Journal of Animal Science

Genetic Analyses of Economic Traits Measured in Range-Raised Herefords at Preweaning and Weaning Ages

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Authors

OPO. F. PahnishFort Keogh Livestock and Range Research Laboratory RRR. L. RobersonTexas A&M University RTRobert Love TaylorUniversity of Arizona

Discussion

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Implication

Quantitative genetic analysis reports heritability and trait correlations in range-raised Hereford calves, suggesting direct selection best improves weaning weight.

Key Points

To estimate heritabilities, genetic and environmental correlations, and selection responses for preweaning and weaning traits in range-raised Hereford cattle.
Analyzed 4 years of performance records from 350 heifer and 370 bull progeny sired by 17 Hereford bulls.
Estimated heritability and correlation parameters within sex and combined using the paternal half-sib method.
Calculated direct and correlated selection responses across preweaning and weaning growth and conformation traits.
Heritability of birth weight was 0.14 in heifers, 0.32 in bulls, and 0.20 when sexes were combined.
Weaning trait heritabilities (daily gain, weight, grade, and condition) ranged from 0.23 to 0.32 in heifers, but were less than 0.10 in bulls, yielding combined estimates between 0.05 and 0.13.
Genetic correlations between birth weight and weaning grade or condition were negative, while direct selection for weaning weight proved more reliable across sexes than selection on birth weight.

Cite This Study

Pahnish et al. (1964) studied this question.

synapsesocial.com/papers/6a95b21b54b0eb02e3628801 https://doi.org/10.2527/jas1964.232562x

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Implication

Quantitative genetic analysis reports heritability and trait correlations in range-raised Hereford calves, suggesting direct selection best improves weaning weight.

Genetic Analyses of Economic Traits Measured in Range-Raised Herefords at Preweaning and Weaning Ages

Discussion

Member takes

Implication

Key Points

Cite This Study

Genetic Analyses of Economic Traits Measured in Range-Raised Herefords at Preweaning and Weaning Ages

Discussion

Member takes

Implication

Key Points

Cite This Study

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