References
- Bolton , W. and Blair , R. 1974 . Poultry Nutrition, Bull 174 , 4th ed. , London : Her Majesty's Stationery Office .
- Carter , T. C. 1971 . The hen's egg: prediction and reduction of downgrading in large producer groups . Br. Poult. Sci. , 12 : 379 – 385 .
- Griffis , D. O. 1973 . The poultry industry in England and Wales—past, present and future . J. R. agric. Soc. , 134 : 37 – 46 .
- Hill , A. T. , Allen , A. B. , Wood , C. W. and Richards , J. F. 1971 . Can the egg grade‐out be improved? . Can. Poultryman , July : 4 – 5 .
- Orr , H. L. and Fletcher , D. A. 1973 . Eggs and Egg Products , 1498 Canadian Department of Agriculture Publications .
- Overfield , N. D. 1970 . “ Factors affecting egg quality—field observations ” . In Factors Affecting Downgrading , Edited by: Freeman , B. M. and Gordon , R. F. 29 – 51 . Edinburgh : British Poultry Science Ltd. .
- Data obtained from Eastwood Ltd while author was on post doctorate transfer of work at the Poultry Research Centre, Edinburgh, Scotland. Agassiz Research Station Contribution No. 218.