Genetic analysis of caliber index in Lipizzan horse using random regression (CROSBI ID 507122)
Prilog sa skupa u zborniku | sažetak izlaganja sa skupa | međunarodna recenzija
Podaci o odgovornosti
Kapš, Miroslav ; Čurik, Ino ; Baban, Mirjana
engleski
Genetic analysis of caliber index in Lipizzan horse using random regression
The variability of the caliber index in Lipizzan horses was studied. The caliber index was defined as (heart girth / height at withers)*(cannon bone circumference / height at withers)*1000. The analysis included measurements (taken at 6, 12, 24 and 36 months of age) of 679 horses born between 1931 and 1999. The corresponding pedigree file consisted of 4786 horses. Covariance functions for the caliber index were estimated using a random regression model. Sex, age of dam and stud- year-season interaction were defined as fixed effects while direct additive genetic and permanent environment were defined as random effects. Polynomial functions of order four were adequate to explain additive genetic functions. The average caliber index increased from 119.1 to 135.4 at 6 to 36 months of age. The estimated heritabilities ranged from 0.16 to 0.20. Genetic correlations and permanent environment between consecutive measurements ranged from 0.28 to 0.77, and 0.78 to 0.99, respectively. The estimated covariance functions demonstrated heterogeneity of covariances and proved to be an adequate tool in estimating genetic parameters and trends of caliber index in Lipizzan horses.
caliber index ; Lippizan horse ; random regression
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Podaci o prilogu
28-28.
2005.
objavljeno
Podaci o matičnoj publikaciji
Book of Abstracts of the 56th Annual Meeting of the European Association for Animal Production
Van der Honing, Ynze
Uppsala: Wageningen Academic Publishers
Podaci o skupu
55th Annual Meeting of the European Association for Animal Production
poster
05.06.2005-08.06.2005
Uppsala, Švedska