THE EFFECT OF EGG WEIGHT ON HATCHABILITY AND THE RELATIONSHIP BETWEEN
2005
Thamir Abdul Aziz
This experiment was carried out on the experimental station–of the College of Veterinary MedicineUniversity of Mosul .Two hundred eggs chosen from 32 weeks old, meat type (Cobb) breeder hens and were classified into four weight classes ;group one (45-50)g; group two(51-56)g ;group three(57-62)g ;group four(63-68)g .Hatchability traits and subsequent chicks performance were studied as a result of different egg groups .The results of hatchability indicated that smaller eggs (45-50)g had a significant (p<0.05) embryonic mortality , less fertility and hatchability than medium weight eggs (58-62)g which showed optimum results among the different egg weight ranges for hatchability .Body weight gain of one day old chicks belong to the last three groups were higher (P<0.05) in the 6 weeks of age than the weight of chicks hatching from the eggs of group one (less than 51g).Better feed conversion ratio were recorded in the chicks from the higher egg weights .Less mortality was found among chicks hatched from medium and large eggs (group, 3and 4) .Attention should be given to egg weights , day-old body weight of chicks for achieving maximum broiler performance of marketing age.
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