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Abstract
(Co)variance components for final score and 15 linear type traits of Jersey cows were estimated by multitrait REML using multiple diagonalization and a repeatability model with 34,999 records of 22,354 cows. Multiple diagonalization gave relative off-diagonals (ratio of squared off-diagonals to the product of diagonals) of <0.1%. Heritabilities and repeatabilities, respectively, were estimated as 0.29 and 0.48 for final score, 0.40 and 0.57 for stature, 0.26 and 0.39 for strength, 0.28 and 0.43 for dairy form, 0.13 and 0.25 for foot angle, 0.13 and 0.25 for rear legs (side view), 0.27 and 0.41 for body depth, 0.31 and 0.52 for rump angle, 0.22 and 0.33 for thurl width, 0.22 and 0.36 for fore udder attachment, 0.28 and 0.46 for rear udder height, 0.26 and 0.42 for rear udder width, 0.32 and 0.48 for udder depth, 0.20 and 0.36 for udder cleft, 0.29 and 0.46 for front teat placement, and 0.31 and 0.48 for teat length. Estimates of heritability generally were higher, and estimates of repeatability were lower, than values used previously for USDA genetic evaluations, which were based on data from the 1970s and early 1980s. Final score was highly correlated both genetically and phenotypically with dairy form and rear udder traits. These estimates of heritabilities and (co)variance components are necessary for multitrait genetic evaluation of linear type traits of US Jerseys.
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Abbreviation Key:
AJCA (American Jersey Cattle Association)References
- Problems arising with genetic trend estimation in dairy cattle.in: Proc. Open Session INTERBULL Annu. Mtg., Aarhus, Denmark. Int. Dep. Anim. Breed. Genet, SLU, Uppsala, Sweden1993 (Bull Eval. Serv. Bull. No. 8)
- Common Principal Components and Related Multivariate Models.John Wiley & Sons, New York, NY1988
- Algorithm AS211: the F-G diagonalization algorithm.Appl. Stat. 1985; 34: 177
- Association of genetic defects with yield and type traits: the Weaver locus effect on yield.J. Dairy Sci. 1990; 73: 2503
- Transformation algorithms in analysis of single trait and of multitrait models with equal design matrices and one random factor by trait: a review.J. Anim. Sci. 1988; 66: 2750
- Transformation of multitrait to unitrait mixed model analysis of data with multiple random effects.J. Dairy Sci. 1990; 73: 2494
- Maximum likelihood estimation of variance components for a multivariate mixed model with equal design matrices.Biometrics. 1985; 41: 153
- Restricted maximum likelihood estimation of variance components in animal model using sparse matrix inversion and a supercomputer.J. Dairy Sci. 1990; 73: 163
- Multiple-trait estimation of variance components of yield and type traits using an animal model.J. Dairy Sci. 1992; 75: 544
- Approximation of estimates of (co)variance components with multiple trait restricted maximum likelihood by multiple diagonalization for more than one random effect.J. Dairy Sci. 1995; 78: 1862
- Phenotypic and genetic relationships between type classification traits in Jerseys.J. Dairy Sci. 1978; 61: 1250
- Sire evaluation for conformation of Jersey cows.J. Dairy Sci. 1979; 62: 1914
- Effect of herd and sire on uniform functional type trait appraisal scores for Ayrshires, Guernseys, Jerseys, and Milking Shorthorns.J. Dairy Sci. 1983; 66: 2173
- Phenotypic relationship of yield and type scores from first lactation with herd life and profitability.J. Dairy Sci. 1996; 79: 689
- Relationships among survival and linear type traits in Jerseys.J. Dairy Sci. 1991; 74: 286
- Correlations among somatic cell scores of milk within and across lactations and linear type traits of Jerseys.J. Dairy Sci. 1995; 78: 914
- Genetic parameters for milk yield, survival, workability, and type traits for Australian dairy cattle.J. Dairy Sci. 1995; 78: 205
- Genetic groups in an animal model.J. Anim. Sci. 1984; 59 (Abstr.): 175
- A new system of type evaluations.Hoard's Dairyman. 1979; 124: 1536
Article info
Publication history
Accepted:
February 4,
1997
Received:
September 16,
1996
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© 1997 American Dairy Science Association. Published by Elsevier Inc.
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