Effect of coverage, storage and pre-incubation in hatchability and embryonic development for egg of broiler breeders (Ross, 308)

Abstract

Abstract This study was conducted in Alfurat traditional hatchery in Alanbar governorate from 25/02/2013 until 26/03/2013 to evaluate effect of eggs coverage, storage and pre-incubation in embryonic development and hatchability for eggs of broiler breeder (Ross, 308). 360 eggs of broiler breeder were used in this study, distributed randomly in factorial trail consisted from three factors (2×2×3), for coverage two treatments (covered by nylon and without covered), storage (4, 7) days, pre-incubation (0, 4, 8) hours, three replicates per treatments (10 eggs per replicate). The eggs pre-incubated at 37.5°C (99.5 F), relative humidity 85%, while the temperature of storage was 15 – 18°C and relative humidity was 55-60%. The results of embryonic development test of hatching eggs before storage and pre-incubation were between fifth and sixth stages according to Eyal-Gilida an Kochav (1976) classification. Whilst pre-incubation for 4 and 8 h before storage led to embryonic development arrival to eighth, ninth and tenth stages from same previous classification, and the pre-incubation for 4 and 8 h after storage led to embryonic development impulsion to ninth, tenth and eleventh stages. On the other hand, the results of this study were showed significant increasing (P≤0.0316) in hatchability from fertile eggs in covered eggs treatment the without covered. While, the pre-incubation for 4 h treatment was recorded high significantly (P≤0.0397) in earlier embryonic mortality. We are concluding from this study that the pre-incubation using for 4 and 8 h led to embryonic development impulsion to favorite storage for decampment of cooling storage conditions. In additional, the coverage of eggs by nylon at storage led to increasing in hatchability from fertile eggs.