Genetic Evaluation of Growth and Reproductive Traits in Sheep
Summary
Genetic evaluation of sheep encompasses the estimation of breeding values and the dissection of genetic parameters that govern growth performance and reproductive efficiency. Key growth traits include birth weight, weaning weight, post-weaning weight and average daily gain, often assessed alongside feed‐efficiency indices such as the Kleiber ratio. Reproductive traits span age at first lambing, lambing interval, litter size and gestation length. Contemporary approaches combine traditional pedigree-based models with genomic information to enhance selection accuracy, accelerate genetic gain and maintain diversity. Understanding genetic correlations between growth and reproductive traits is critical to avoid unfavourable responses when selecting for one trait at the expense of another. Maternal effects and permanent environmental influences are incorporated into mixed models to refine estimates of direct genetic merit. Advances in statistical methodology, high-throughput genotyping and global data sharing have enabled more precise identification of quantitative trait loci and facilitated the design of breeding programmes tailored to diverse production environments. Such efforts support sustainable intensification of sheep systems worldwide, improving profitability, animal welfare and resource use efficiency.
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Genetic Evaluation of Growth and Reproductive Traits in Sheep publication trend
The graph below shows the total number of articles in genetic evaluation of growth and reproductive traits in sheep across all publications each year (not limited to Nature Index journals).
Technical terms
Heritability: Proportion of observed variation in a trait attributable to genetic differences among individuals.
Genetic correlation: Measure of the extent to which two traits share common genetic determinants.
Kleiber ratio: Index of feed‐efficiency calculated as daily gain divided by metabolic body weight.
Breeding value: Predicted genetic merit of an individual based on its own performance and that of relatives.
Maternal effects: Non-genetic and genetic influences of the dam on offspring phenotype beyond direct inheritance.
References
- Estimate of Genetic Parameters for Pre-Weaning Growth Traits and Kleiber Ratio in Palestinian Sheep Breeds. Agriculture (2024).
- Genetic parameter estimation for pre-weaning growth traits in Jordan Awassi sheep. Veterinary World (2018).
- Genetic parameters for growth, reproductive and maternal traits in a multibreed meat sheep population. Genetics and Molecular Biology (2009).
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