The Effects of End of the Growth Period Live Weights on Pure Lines Egg Yield Used in Brown Egg Production
2020
Yilmaz, Salih | Sarıca, Musa | Erensoy, Kadir
This study was carried out in order to reveal the effects of live weight at the end of the rearing periodon yield characteristics during the laying period in RIR-I and BAR-I pure lines, which are theparents of ATAK-S chickens developed for use in brown egg production. Significant differenceswere found between genotypes and between different body weight groups in terms of 16-week age,50% yield age, 40-week live weight determination of BAR-I and RIR-I genotypes, and mortalityrate between 16-40 weeks of age. First spawning age, 50% yield age and peak yield age reachedearlier in the heavy group of the BAR-I genotype. Those in the light group of RIR-I genotypereached these yield levels at the latest. It was revealed that the BAR-I genotype was higher than theRIR-I genotype in terms of egg production hen-day (piece) and chicken-poultry (piece) values, butthe RIR-I genotype reached a higher yield value in terms of hatching egg yield (pieces). In general,the difference between the lines was found to be significant in terms of internal and external eggquality characteristics. Differences between genotypes in feather scores were found to be significantand a decrease in feather score was observed depending on age. In terms of FPD values, it wasobserved that the differences between genotypes were not significant, but FPD damages increasedas age and live weight increased. As a result of the research, the benefit of classifying RIR-I andBAR-I pure lines according to body weight at the end of the rearing period has been revealed,especially in terms of hatching egg production.
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