References
- Charles , D. R. 1976 . “ The economic importance of feathering ” . In Gleadthorpe Experimental Husbandry Farm Poultry Booklet , 25 – 27 . England : Agricultural Development and Advisory Service .
- Charles , D. R. , Emmans , G. C. and Dun , P. 1976 . “ Detailed results of studies on ventilation, temperature, diets and regulated feeding ” . In Gleadthorpe Experimental Husbandry Farm, Poultry Booklet , 8 – 21 . England : Agricultural Development and Advisory Service .
- Davis , R. H. , Hassan , O. E. M. and Sykes , A H. 1972 . The adaptation of energy utilization in the laying hen to warm and cool ambient temperatures . Journal of Agricultural Science, Cambridge , 79 : 363 – 369 .
- Davis , R. H. , Hassan , O. E. M. and Sykes , A. H. 1973 . Energy utilization in the laying hen in relation to ambient temperature . Journal of Agricultural Science, Cambridge , 80 : 173 – 178 .
- Emmans , G. C. and Charles , D. R. 1976 . “ Climatic environment and poultry feeding in practice ” . In Nutrition and the Climatic Environment Edited by: Haresign , W. , Swan , H. and Lewis , D. 31 – 48 . London , Butterworths
- Hill , A. T. and Hunt , J. R. 1978 . Layer cage depth effects on nervousness, feathering, shell breakage, performance and net egg returns . Poultry Science , 57 : 1204 – 1216 .
- Hughes , B. O. 1978 . The frequency of neck movements in laying hens and the improbability of cage abrasion causing feather wear . British Poultry Science , 19 : 389 – 293 .
- Hughes , B. O. and Wood‐Gush , D. G. M. 1977 . Agonistic behaviour in domestic hens: the influence of housing method and group size . Animal Behaviour , 25 : 1056 – 1062 .
- Leeson , S. and Morrison , W. D. 1978 . Effect of feather cover on feed efficiency in laying birds . Poultry Science , 57 : 1094 – 1096 .
- Richards , S. A. 1977 . The influence of loss of plumage on temperature regulation in laying hens . Journal of Agricultural Science, Cambridge , 89 : 393 – 398 .
- Sykes , A. H. 1976 . “ Nutrition‐environment interactions in poultry ” . In Nutrition and the Climatic Environment Edited by: Haresign , W. , Swan , H. and Lewis , D. 17 – 29 . London , Butterworths
- Present address: Department of Animal Science, University of Illinois, Urbana, Illinois 61801, USA.