References
- BLOKHUIS, H.J., BEUVING, G. and ROMMERS, J.M. (1993) Individual variation of stereotyped pecking in laying hens. In: Proceedings of the 4th European Symposium on Poultry Welfare (Eds Savory, C.J. and Hughes, B.O.), Universities Federation for Animal Welfare, Potters Bar, pp. 19–26
- WOOD-GUSH, D.G.M. and ROWLAND, C.G. (1973) Allopreening in the domestic fowl. Revue Comportement Animal 7: 83–91