Changes in feather condition in relation to feather pecking and aggressive behaviour in laying hens.

The aim of this experiment was to describe and examine the relationship between pecks received by individual birds and the feather and skin damage of those birds at different ages. The effect of group size was also studied. Laying hens were raised in floor pens in group sizes of 15, 30, 60 and 120 birds, each with 4 replicates. Behavioural observations were performed at the ages of 22, 27, 32 and 37 weeks. Detailed feather scoring was carried out at the ages of 18, 23, 28 and 33 weeks. Behavioural observations focused on the number of feather pecks (gentle and severe) and aggressive pecks received, and on the part of the body that was pecked. Scoring of feather and skin damage focused on the same 11 parts of the body. Increasing numbers of aggressive pecks received were associated with decreased body weight and increased feather damage at the ages of 27 and 32 weeks. The number of severe feather pecks received was significantly related with feather damage at all ages; however, no relation with gentle feather pecks received was found. Group size had a significant effect on feather condition, with large group sizes having most feather damage.

[1]  J. A. Hogan,et al.  Feather pecking and chronic fear in groups of red junglefowl: their relations to dustbathing, rearing environment and social status , 1993, Animal Behaviour.

[2]  R. Tauson,et al.  Evaluation of Procedures for Scoring the Integument of Laying Hens—Independent Scoring of Plumage Condition , 1984 .

[3]  R. Tauson,et al.  Influence of plumage conditions on the hen's feed requirement. , 1980 .

[4]  C. Savory.  Feather pecking and cannibalism , 1995 .

[5]  Gerry C. Emmans.  15 – CLIMATIC ENVIRONMENT AND POULTRY FEEDING IN PRACTICE , 1989 .

[6]  L. Keeling,et al.  Poultry health and behaviour in a tiered system for loose housed layers , 1995 .

[7]  B. O. Hughes.  The effect of implanted gonadal hormones on feather pecking and cannibalism in pullets. , 1973, British poultry science.

[8]  Gunter Wennrich.  Studien zum Verhalten verschiedener Hybrid-Herkünfte von Haushühnern (Gallus domesticus) in Boden-Intensivhaltung mit besonderer Berücksichtigung aggressiven Verhaltens sowie des Federpickens und des Kannibalismus : 6. Mitteilung, Verhaltensweisen beim Kannibalismus , 1975 .

[9]  I. Duncan,et al.  The influence of strain and environmental factors upon feather pecking and cannibalism in fowls. , 1972, British poultry science.

[10]  A. Horn,et al.  Correlates and consequences of allopecking in White Leghorn chickens , 1995 .

[11]  C. Savory,et al.  Behavioural development in groups of pen-housed pullets in relation to genetic strain, age and food form. , 1997, British poultry science.

[12]  H. B. Simonsen,et al.  Effects of rearing experience and stimulus enrichment on feather damage in laying hens , 1993 .

[13]  H. Blokhuis,et al.  Some observations on the development of feather-pecking in poultry , 1984 .

[14]  G. Perry,et al.  Feather pecking and cannibalism in a caged layer flock. , 1975, British poultry science.