engleski

Fixed effects in models for the genetic evaluation of gilts from field test in Vojvodina

Fixed effects in the model for backfat thickness and time on test in performance tested gilts were evaluated. Data records from 29 large scale farms in Vojvodina in period from January 2001 to December 2015 were analyzed. In total, 34, 172 data records from field test of gilts were included in the study. Analysis included four pure breeds (Landrace, Large White, Duroc, Pietrain) and reciprocal crossbreds of Landrace and Large White. Least square method implemented in SAS GLM procedure was used to analyse fixed effects on traits obtained in field test of gilts. Two statistical models were developed: one for each trait analysed. Effects tested in the models were: genotype, season of the test, and weight at the end of the test. The model for time on test was simplier than model for backfat thickness, containing only fixed effects of genotype and season of the test. The weight at the end of the test was included in the model for backfat thickness. Choice of the model and effects in the model was based on coefficient of regression and degrees of freedom. All effects in the models were statistically significant. The coefficient of determination of the model for backfat thickness was 0.51, while the coefficient of determination for model for time on test was 0.59. Obtained results are the first step in setting up statistical model for genetic evaluation using best linear unbiased prediction and will be useful in future development of the statistical model for prediction of breeding values for economically important traits in gilts in performance test in analysed population.

Pigs ; Backfat Thickness ; Time on test ; Age ; Performance Test ; Fixed Effects

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