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Variance component estimation and multitrait genetic evaluation for type traits of dairy goats
M F Luo1, G R Wiggans, S M Hubbard
1American Dairy Goat Association, Spindale, NC 28160, USA.
Journal of Dairy Science
|March 1, 1997
Summary
This study estimated genetic correlations for dairy goat traits using an animal model. Key findings show strong positive genetic links between final score and traits like fore udder attachment, indicating potential for breeding improvements.
Area of Science:
- Animal breeding and genetics
- Dairy science
- Quantitative genetics
Background:
- Accurate estimation of genetic parameters is crucial for effective dairy goat breeding programs.
- Understanding the genetic relationships between various linear type traits and overall final score is essential for selection decisions.
Purpose of the Study:
- To estimate covariance components for final score and 13 linear type traits in dairy goats.
- To determine heritabilities and genetic correlations among these traits using an animal model.
Main Methods:
- Multitrait Restricted Maximum Likelihood (REML) analysis was employed.
- Canonical transformation with an animal model was utilized for covariance component estimation.
- Data comprised 10,932 type appraisals from 1988-1994.
Main Results:
- Heritability estimates ranged from 0.19 (rear udder arch) to 0.52 (stature).
- Most genetic correlations between linear traits and final score were positive, with notable exceptions for dairyness (-0.15) and teat diameter (-0.10).
- Strong positive genetic correlations were observed between final score and fore udder attachment (0.66), rear udder arch (0.44), rump width (0.36), and strength (0.30).
Conclusions:
- The findings support the use of multitrait evaluations for dairy goat breeding.
- Genetic correlations suggest that selection for improved final score can be achieved through selection on specific linear type traits.
- The study highlights the importance of considering genetic relationships to optimize breeding strategies and improve overall dairy goat performance.