A note on the possibility to include carcass traits in the prediction of breeding values for pigs | Proučevanje možnosti vključitve klavnih lastnosti v napoved plemenske vrednosti pri prašičih

anglais. Genetic parameters for measurements, which are taken on the slaughter line for meat percentage evaluation and some ham traits, were estimated with intention, to study the possibility of including these traits in the prediction of breeding value for pigs. Data from 2167 pigs (1046 barrows and 1121 gilts) with known pedigree were analyzed. Pigs were group housed and fattened on ad libitum feeding regime in field environment of farm Nemščak. Pigs were slaughtered between April 1999 and December 2000. Variance components were estimated with univariate models by restricted maximum likelihood method (REML). The models included sex, genotype and season (year-month) as fixed effects and warm carcass weight or age at slaughter as linear regression. Estimates of heritability were moderate to high, for warm carcass weight (0.32), loin depth (0.41), loin fat thickness (0.45), lean meat percentage (0.46), lean meat weight (0.38), ham weight (0.32), weight of skin with subcutaneous fat of ham (0.47), weight of meat and bones of ham (0.41), average daily gain of warm carcass weight (0.32) and for lean meat (0.38). Additive genetic variances were also high. Lean meat percentage and weight of skin with subcutaneous fat of ham are candidate traits for inclusion in selection program.

slovène. Z namenom proučevanja možnosti vključitve klavnih lastnosti v napoved plemenske vrednosti pri prašičih smo ocenili komponente variance za lastnosti, ki se za ocenitev odstotka mesa v prašičjem trupu merijo na klavni liniji ter za lastnosti šunke. V analizo smo zajeli 2167 pitancev (1046 kastratov in 1121 svinjk) z znanim poreklom. Pitanci so bili skupinsko vhlevljeni s krmljenjem po volji v proizvodnih razmerah na farmi Nemščak. Zaklani so bili med aprilom 1999 in decembrom 2000. Komponente variance smo ocenili z enolastnostnimi modeli po metodi omejene največje zanesljivosti (REML). V sistematski del modelov smo vključili vpliv spola, genotipa in sezone (leto-mesec) kot vplive z nivoji ter maso toplih polovic ali starost ob zakolu kot linearni regresiji, v naključni del pa vpliv živali. Ocene heritabilitet so bile srednje do visoke; za maso toplih polovic (0,32), za meritev M (0,41), ki je najkrajša razdalja med prednjim koncem m. gluteus medius in zgornjim robom hrbteničnega kanala, za meritev S (0,45), ki je najtanjša debelina podkožnega maščobnega tkiva s kožo nad m. gluteus medius, za odstotek mesa (0,46), za maso mesa (0,38), za maso šunke (0,32), za maso kože s podkožno maščobo šunke (0,47), za maso mesa in kosti šunke (0,41), ter dnevni prirast mase toplih polovic (0,32) in dnevni prirast mase mesa (0,38). Poleg heritabilitet so bile velike tudi aditivne genetske variance. Za vključitev v selekcijski program bi na podlagi ocen predlagali odstotek mesa in maso kože s podkožno maščobo šunke.