References
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- Auckland , J. N. and Wilson , S. B. 1975c . Effects of restricting the amounts of medium or low energy diets fed to laying hens in different colony sizes . Br. Poult. Sci. , 16 : 453 – 459 .
- Sykes , A. H. 1972 . “ The energy cost of egg production ” . In Egg Formation and Production , Edited by: Freeman , B. M. and Lake , P. E. 187 – 196 . Edinburgh : British Poultry Science Ltd. .
- Present address: National Poultry Company, Baghdad, Iraq. 217