References
- Cain , J. R. and Wilson , W. O. 1974 . The influence of specific environmental parameters on the circadian rhythms of chickens. . Poultry Science , 53 : 1438 – 1447 .
- Hillman , W. S. 1973a . Non‐circadian photoperiodic timing in the aphid . Megoura. Nature, London , 242 : 120 – 129 .
- Hillman , W. S. 1973b . Light, time and the signals of the year. . Bioscience , 23 : 81 – 86 .
- Mongin , P. and Sauveur , B. 1974 . Voluntary food and calcium intake by the laying hen. . British Poultry Science , 15 : 349 – 359 .
- Nys , Y. , Sauveur , B. , Lacassagne , L. and Mongin , P. 1976 . Food, calcium and water intakes by hens lit continuously from hatching. . British Poultry Science , 17 : 351 – 360 .
- van Tienhoven , A. and Ostrander , C. E. 1973 . The effect of interruption of the dark period at different intervals on egg production and shell breaking strength. . Poultry Science , 52 : 998 – 1001 .
- van Tienhoven , A. and Ostrander , C. E. 1976 . Short total photoperiods and egg production of white Leghorns. . Poultry Science , 55 : 1361 – 1364 .