University of Khartoum

Effect of Egg Weight and Shell Thickness on Hatchability and Embryonic Mortality of Cobb Broiler Breed

Effect of Egg Weight and Shell Thickness on Hatchability and Embryonic Mortality of Cobb Broiler Breed

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Title: Effect of Egg Weight and Shell Thickness on Hatchability and Embryonic Mortality of Cobb Broiler Breed
Author: Sakin, Ahmed Ibrahim Yagoub
Abstract: Two experiments were carried out to study the effect of egg weight and shell thickness on hatchability and embryonic mortality of broiler breed. Nine hundred hatching eggs were collected, from Cobb broiler breeder flock of 64 weeks of age in a commercial Hatchery Unit. Four hundred and fifty eggs with different sizes were selected in the first experiment to study the effect of egg weight on hatchability and embryonic mortality. Based on the weight, the eggs were divided into three groups: small (65-69g), medium (70-74g) and large (75-80g). In the second experiment the egg shell thickness were determined from the value of the specific gravity to three groups: 0.35mm, 0.37mm and 0.39mm. Each group contained three replicates 50 eggs/replicate. Egg specific gravity, was determined the shell thickness. The results showed that fertility and hatchability of total eggs(fertile and unfertile) were significantly(P≤0.05) effected by egg weight. the hatchability decreased when egg weight is increased. The hatchability is greater in small weight eggs by 7% and 11% rather than medium and large weight egg, respectively. However, hatchability and embryonic mortality of fertile eggs were not significantly (P≥0.05) affected by eggs weight. Egg shell thickness had no significant (P≥0.05) effect on hatchability and embryonic mortality. It can be concluded that the medium and large egg weight adversely affect hatchability. Increased of egg weight above 65-69g decreases hatchability.
URI: http://khartoumspace.uofk.edu/123456789/16118
Date: 2015-09-15


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