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Genetic parameter estimates for pre-weaning weight traits in Dorper sheep
F W.C. Neser1, G J. Erasmus, J B. van Wyk
1Department of Animal Science, University of the Orange Free State, P.O. Box 339, 9300, Bloemfontein, South Africa
Small Ruminant Research : the Journal of the International Goat Association
|April 27, 2001
Summary
Genetic parameters for Dorper sheep growth traits were analyzed. Selection can improve birth, 42-day, and weaning weights without significant trait antagonism.
Area of Science:
- Animal Genetics
- Quantitative Genetics
- Livestock Science
Background:
- Understanding genetic parameters is crucial for effective breeding programs in Dorper sheep.
- Accurate estimation of heritability and genetic correlations informs selection strategies for growth traits.
Purpose of the Study:
- To estimate direct and maternal genetic parameters for birth, 42-day, and 100-day weights in a South African Dorper flock.
- To assess the genetic correlations between direct and maternal effects for these growth traits.
Main Methods:
- Analysis of pedigree and performance data from the Glen Agricultural Institute Dorper flock.
- Estimation of heritability (direct and maternal) and genetic correlations using appropriate statistical models.
Main Results:
- Direct heritability estimates ranged from 0.11 (birth) to 0.28 (42-day).
- Maternal heritability estimates were consistently 0.10 across all measured weights.
- Genetic correlations between direct and maternal effects varied, notably -0.63 at 42 days and -0.58 at 100 days.
Conclusions:
- Growth traits in Dorper sheep exhibit moderate heritability and significant genetic correlations.
- Selection for improved growth is feasible, as no serious antagonisms were detected among the studied direct and maternal effects.