Original scientific paper
GENOTYPE X DIET INTERACTIONS WITH MEAT MASS OF MAIN CARCASS PARTS IN BROILER CHICKENS
Nedeljka Nikolova
; University “Ss. Ciril and Methodius” Skopje, Skopje, R Macedonia
Vasil Kostov
; University “Ss. Ciril and Methodius” Skopje, Skopje, R Macedonia
Tosho Kostadinov
; University “Ss. Ciril and Methodius” Skopje, Skopje, R Macedonia
Abstract
This paper examines genotype x diet interactions with meat mass of main carcass parts (breast, drumstick and thigh) in broiler chickens. The study was conducted in chickens of proveniences Cobb 500 and Hubbard Classic, which were fed variety of energy - protein feed mixtures (mixture I –energy stronger with higher E:P ratio and mixture II – protein stronger with lower E:P ratio). Chickens were fattened to 49 days of age. Randomly selected chickens were sacrificed and processed in dressing percentage "ready for grilling" at the end of 35th, 42nd and 49th day of age. Each carcass was separated at the most important edible parts. Their yields and share were determinate and put in relationship with body weight before the slaughtering. The existence of interactions was confirmed in chickens of same age, the analysis of variance in Statistic computer program, subprogram ANOVA, while the definition of treatments where interaction appeared was proven by LSD test at the level of 0.01% accuracy. Genotypes x diet interactions were demonstrated in all age groups only in the analysis of breast meat mass. Cobb chickens fed mixture I on 42nd and 49th days of age and those fed mixture II on 35th day of fattening had significantly more breast meat than Hubbard chickens. The interaction in mass of drumstick meat was proven on 35th day of age, while in mass of thigh meat it was demonstrated in the last week of fattening. Cobb chickens fed protein stronger meal had significantly more meat on drumstick, while chickens fed energy stronger mixture appeared to have more mass of meat on thigh. Hubbard chickens that used mixture II had insignificant greater mass of meat in most important parts of carcass during the 35th and 42nd days of fattening. Genotype x diet interactions are responsible for no more than 2% of the total variations, but although the influence is rather weak, they should be implemented in most of the analyses.
Keywords
genotype x diet interactions; main parts of carcass; meat mass; broiler chickens
Hrčak ID:
60601
URI
Publication date:
15.8.2010.
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