Study of Some Productive Performance and Egg quality Traits in Two Commercial Layer Strains.

G.N. Rayan, M.Y. Mahrous, A. Galal, A.H. El-Attar,

Abstract


This experiment was conducted to evaluate genetic differences of productive
performance and egg quality traits in two commercial layer strains of chickens under
prevailing Egyptian environmental conditions. Results demonstrated that brown strain had
significantly heavier body weight compared to the white ones. Body weight increased
gradually as layers age increased. The strain had insignificant effect on egg number, while
layer age had significant effect on this trait. The brown layer hens produced significantly
heavier egg weight compared to the white ones. Egg mass of brown eggs were heavier than
white eggs. The present results showed that the brown layers significantly consumed more
feed compared to the white ones. W-36 layers strain had better feed conversion ratio
compared to brown layers strain. Concerning age effect, also feed conversion ratio
increases with advancing of layers age, consequently feed efficiency decreases. The brown
eggs recorded significantly higher in all eggshell quality traits compared to the white eggs.
The mean performance of the eggshell quality traits such as (egg shape index, eggshell
breaking strength, shell percentage and shell thickness) declined with advancing layers age
with the exception of eggshell weight which increased with layers age. Regarding internal
egg quality, it could be noticed that albumen weight and percentage of the brown eggs was
significantly higher than that recorded for white ones. While, we found that white eggs had
significantly higher Haugh unit compared to the brown ones. Generally, the albumen
weight increases with advancing of layers ages. Inversely, albumen as a percentage of total
egg weight and Haugh units decreased as layers age increased. The yolk weight, yolk
percentage and yolk index increases with advancing of layers ages.


Other data

Title Study of Some Productive Performance and Egg quality Traits in Two Commercial Layer Strains.
Authors G.N. Rayan ; M.Y. Mahrous ; A. Galal ; A.H. El-Attar 
Keywords Commercial layers;Egg production;Egg quality;Strain;Age
Issue Date Jun-2013
Publisher Egyptian Poultry Science Association
Journal Egyptian Poultry Science Journal 

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