Naslov
Genetic analysis of caliber index in Lipizzan horse using random regression

Autori
Kapš, Miroslav ; Čurik, Ino ; Baban, Mirjana

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Book of Abstracts of the 56th Annual Meeting of the European Association for Animal Production / Van der Honing, Ynze - Uppsala : Wageningen Academic Publishers, 2005, 28-28

Skup
55th Annual Meeting of the European Association for Animal Production

Mjesto i datum
Uppsala, Švedska, 05.06.2005. - 08.06.2005

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
caliber index ; Lippizan horse ; random regression

Sažetak
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.

Izvorni jezik
Engleski

Znanstvena područja
Poljoprivreda (agronomija)

POVEZANOST RADA