THE EFFECT OF GENOTYPE, REARING SYSTEM AND DURATION OF FATTENING ON PHYSICAL CHARACTERISTICS OF TIBIA IN BROILERS
Zdenka Škrbić, Miloš Lukić, Veselin Petričević, Vesna Krnjaja, Nikola Delić
Institute for Animal Husbandry, Belgrade, Serbia
zdskrbic@gmail.com
The aim of the research was to investigate the effects of medium-growing broiler genotypes, age of broilers at slaughter and rearing system in non-conventional meat production on the physical characteristics of the tibia. The study was conducted on Redbro and Redbro Naked Neck chickens, which were reared in the free range system. The quality of tibia was tested on Redbro chickens in free range and extensive conditions in the closed facility, until 42 or 84 days of age. Physical characteristics of tibia: length, mass, cross sectional area of the diaphysis, breaking force and specific breaking force, were established after slaughtering of the sample of 12 broilers per treatment and separation of the left tibia from the skeleton. The studied chicken genotypes have not exerted significant effect on osteometrical and biome- chanical characteristics of the tibia. The effect of rearing system is not statistically confirmed, but the potential for improving the quality parameters of the tibia in the rearing system with free range could be established. Duration of fattening period in extensive rearing system in the closed poultry house, as well as gender, have demonstrated a signif- icant effect on the physical characteristics of the tibia.
Keywords: broilers; tibia; medium-growing genotype; non-conventional production systemovi
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