Behavioral and Genetic Adaptation of Laying Hens to High-Density Environments

High-density, barren-cage environments are provided for most hens kept for egg production. Beak trimming, toenail removal, decreasing group size, increasing space per hen, and certain alterations in cage design increase well-being and productivity of individual hens. Preliminary evidence indicates that selection may significantly improve adaptation via changes in behavioral characteristics. (Accepted for publication 18 June 1981)

[1]  A. T. Hill,et al.  Layer Cage Depth Effects on Nervousness, Feathering, Shell Breakage, Performance, and Net Egg Returns , 1978 .

[2]  D. J. Lee,et al.  Battery gage shape: The laying performance of medium‐ and light‐body weight strains of hens , 1976 .

[3]  J. Craig,et al.  Agonistic Behavior and Egg Production of Caged Layers: Genetic Strain and Group-Size Effects , 1976 .

[4]  W. H. Thorpe Welfare of Domestic Animals , 1969, Nature.

[5]  J. Craig,et al.  Crowding Cockerels in Cages: Effects on Weight Gain, Mortality, and Subsequent Fertility, , 1977 .

[6]  J. Craig,et al.  Inhibition of agonistic acts between domestic hens by a dominant third party , 1980 .

[7]  R. S. Hansen Nervousness and hysteria of mature female chickens. , 1976, Poultry science.

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

[9]  J. Craig,et al.  Agonistic behaviour influenced by strangeness, crowding and heredity in female domestic fowl () , 1969 .

[10]  F. B. Mather,et al.  Evidence Concerning Genetic Improvement in Commercial Stocks of Layers , 1976 .

[11]  J. Craig,et al.  Selection for Egg Mass in Different Social Environments 3. Changes in Agonistic Activity and Social Dominance , 1978 .

[12]  J. Craig,et al.  Crowding and agonistic behavior: a curvilinear relationship. , 1974, Poultry science.

[13]  W. C. Allee,et al.  Some Relations between Flock Size and Agonistic Behavior in Domestic Hens , 1957, Physiological Zoology.

[14]  J. Craig,et al.  Genetic selection for social dominance ability in chickens , 1965 .

[15]  M. E. Jackson,et al.  Effect of Cage Size and Bird Density on Performance of Six Commercial Strains of Layers , 1970 .

[16]  J. Craig Correlated Responses in Body Weight and Egg Production Traits in Chickens Selected for Social Dominance , 1968 .

[17]  J. Craig,et al.  Agonistic behavior of caged chickens related to group size and area per bird , 1975 .

[18]  A. Dayton,et al.  Changes in relative aggressiveness and social dominance associated with selection for early egg production in chickens. , 1975, Poultry science.

[19]  J. Craig,et al.  Territorial Behavior and Social Interactions of Pullets Kept in Large Flocks , 1969 .

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

[21]  J. Craig,et al.  Effects of Flock Size, Age at Housing, and Mating Experience on Two Strains of Egg-type Chickens in Colony Cages , 1978 .

[22]  D. Wood‐Gush,et al.  Agonistic behaviour in domestic hens: The influence of housing method and group size , 1977, Animal Behaviour.

[23]  R. Beilharz,et al.  APPLIED ETHOLOGY AND ANIMAL WELFARE , 1981 .

[24]  J. Bareham A comparison of the behaviour and production of laying hens in experimental and conventional battery cages , 1976 .

[25]  G. McBride,et al.  The Social Organization and Behaviour of the Feral Domestic Fowl , 1969 .

[26]  J. Craig,et al.  Sexual maturity of males representing twelve strains of six breeds of chickens. , 1960 .