PHENOTYPE CORRELATION BETWEEN AGE AND MAJOR PRODUCTION AND REPRODUCTIVE TRAITS OF HEAVY HYBRID PARENTAL FLOCK ROSS 308
Sreten Mitrović1, Vladan Djermanović1, Nedeljka Nikolova2
1University of Belgrade, Institute of Zootechnology, Nemanjina 6, 11080 Belgrade–Zemun, Serbia,
2University Ss. Ciril and Methodius, Institute of Animal Science, Bul. Ilinden 92а, 1000 Skopje, Republic of Macedonia
mitrovic@agrif.bg.ac.rs
These researches were conducted in order to establish the influence of the age of the parental flock (period of raising stadium) of the heavy hybrid Ross 308 on important reproductive capabilities, respectively on carrying eggs intensity of brood eggs, incubation results, egg mass, one day old chicks mass, as well as the relative share of chick in the egg mass. The used period of the parental flock lasted 40 (total eggs) and 38 (brood eggs) weeks and there was a possibility that on the basis of achieved results, calculating the phenotypic correlation, to some extent could make concrete conclusions about the influence of the age on the monitored parameters by raising the above-mentioned parental flock. The phenotypic correlation between the observed properties was determined from the second half of the using of the parental flock, i.e. from the 41st week of age (20th week of carrying egg capacity) to the end of the production process when the parents age flock was 61 weeks of age (41 weeks of egg production). The flocks age had statistically significant (P < 0.05) influence on the intensity of the capacity of the brood eggs until 49th week (RP = 0.391), and on the percentage of the hatched chicks of the eggs incubating until 50th week (RP = 0.434) of age. With the aging of the parental flock, the egg mass and the hatched one day chicks mass statistically significantly increased (P < 0.001). Between the egg mass and the absolute mass of chicks complete correlation connectivity (P < 0.001) was identified, and between the egg mass and the relative share of chick [(chick mass/egg mass) × 100]. A had been very strong (P < 0.001) and strong (P < 0.01) correlation connectivity.
Keywords: parental flock age; Ross 308 hybrid; hatching eggs mass; chick mass; chick quality; phenotypic correlation
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