Estimation of (Co)Variance Components for Age at First Farrowing and Farrowing Interval in Czech Large White
|Cathegory||Entries in proceedings|
We aimed to estimate the variance and covariance components for the original and transformed age at the first farrowing (AFF) and farrowing interval in this study. The data from 25,094 sows (77,544 observations) of the Czech Large White pig breed between January 2000 and December 2015 provided by Czech Pig Breeders Association were used for the analyses. Data higher than the median were only transformed. The farrowing interval was evaluated separately from the first to the fourth parity (FI1-FI4). The heritabilities for the original traits were very low: 0.17, 0.11, 0.07, 0.06, and 0.06 for AFF and FI1-FI4, whereas those for the transformed traits were higher: 0.19, 0.14, 0.11, 0.11, and 0.12 for AFF and FI1-FI4, respectively. The phenotypic correlations between the traits were low, but significant. The estimated genetic correlations between all the farrowing intervals were clearly lower than one, indicating that all the farrowing intervals should be treated as different traits. Using the transformation procedure decreased the skewness and kurtosis of the original data in our study. The heritabilities of the analysed farrowing intervals were only increased owing to the transformation
Žáková Eliška, Ing., Ph.D.
Krupová Zuzana, Ing., Ph.D.
Michaličková Monika, Ing.
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