The effect of fattening duration in different rearing systems on slaughter traits of broiler chickens of genotype Redbro

Abstract

Slow growing chickens of genotype Redbro, were reared in two systems in order to determine the effect of duration of fattening on values of slaughter yields/dressing percentages and shares of main carcass parts. Fattening of chickens in chicken coop to age of 84 days had considerable effect on increase of slaughter yields: "Conventional processing"(83.59%), "Ready to roast"(77.22%) and "Ready to grill"(67.17%) compared to 42nd day of age (82.21; 74.87 and 65.42%). Redbro chickens reared on free range had lower body masses compared to chickens reared from chicken coops in all investigated ages. Beside significant increase of body mass, longer fattening period influenced considerably decrease of share of back, pelvic and wings. In both rearing systems, prolonging of fattening had statistically significant effect on increase of share of abdominal fat. .

Pilići sporog porasta, genotipa Redbro, su gajeni u dva sistema u cilju utvrĐivanja uticaja dužine tova na vrednosti klaničnih randmana i udela osnovnih delova u trupu. Tov pilića u objektu do 84. dana uzrasta je uticao na značajno povećanje klaničnih randmana: "klasična obrada"(83.59%), "spremno za pečenje"(77.22%) i "spremno za roštilj"(67.17%) u odnosu na 42. dan uzrasta (82.21; 74.87 i 65.42%). Redbro pilići gajeni na ispustu su imali manje telesne mase u odnosu na piliće iz objekta u svim ispitivanim uzrastima. Pored signifikantnog porasta telesne mase, duže trajanje tova pilića Redbro na ispustu je značajno smanjio udeo leĐa, karlice i krila. U oba sistema gajenja produžavanje tovnog perioda je statistički značajno povećao udeo abdominalne masti. .