References
- Low , E. M. 1970 . “ The importance of grading in egg marketing ” . In Factors Affecting Egg Grading , Edited by: Freeman , B. M. and Gordon , R. F. 3 – 16 . Edinburgh : British Poultry Science Ltd. .
- Snedecor , G. W. 1956 . Statistical Methods , 5th ed. , 212 – 236 . Ames : Iowa College Press .
- Wells , R. G. 1972 . The effect of varying stocking density on the development and subsequent laying performance of floor‐reared pullets . Br. Poult. Sci. , 13 : 13 – 25 .