Production-related traits of layers reared in different sized flocks: The concept of problematic intermediate group sizes

Poultry Science

Volumn 82, Issue 9, 2003, Pages 1393-1396

  Keeling, L J ^a   Estevez, I ^a,b   Newberry, R C ^c   Correia, M G ^a  

^a SWEDISH UNIVERSITY OF AGRICULTURAL SCIENCES   (Sweden)

^b UNIVERSITY OF MARYLAND   (United States)

^c WASHINGTON STATE UNIVERSITY   (United States)

Author keywords

Behavior; Body weight; Egg weight; Group size; Social structure

Indexed keywords

AVES;

AGGRESSION; ANIMAL; ANIMAL HOUSING; ANIMAL HUSBANDRY; ARTICLE; BODY WEIGHT; CHICKEN; FEMALE; GROWTH, DEVELOPMENT AND AGING; OOCYTE; POPULATION DENSITY; SOCIAL BEHAVIOR;

AGGRESSION; ANIMAL HUSBANDRY; ANIMALS; BODY WEIGHT; CHICKENS; FEMALE; HOUSING, ANIMAL; OVUM; POPULATION DENSITY; SOCIAL BEHAVIOR;

EID: 0142197133     PISSN: 00325791     EISSN: None     Source Type: Journal    
DOI: 10.1093/ps/82.9.1393     Document Type: Article

References (18)

1. Adams, A. W., and J. V. Craig. 1984. Effect of crowding and cage shape on productivity and profitability of caged layers: A survey. Poult. Sci. 54:238-242.
2. Bilcik, B., and L. J. Keeling. 1999. Changes in feather condition in relation to feather pecking and aggressive behaviour in laying hens. Br. Poult. Sci. 40:444-451.
3. Bilcik, B., L. J. Keeling, and R. C. Newberry. 1998. The effect of group size on tonic immobility in laying hens. Behav. Proc. 43:53-59.
4. Collias, N. E., and E. C. Collias. 1996. Social organization of a red junglefowl, Gallus gallus, population related to evolution theory. Anim. Behav. 51:1337-1354.
5. D'Eath, R. B., and L. J. Keeling. Social discrimination in laying hens is affected by group size. Appl. Anim. Behav. Sci. (in press).
6. Estevez, I., R. C. Newberry, and L. Arias de Reyna. 1997. Broiler chickens: A tolerant social system? Etologia 5:19-29.
7. Estevez, I., R. C. Newberry, and L. J. Keeling. 2002. Dynamics of aggression in domestic fowl. Appl. Anim. Behav. Sci. 76:307-325.
8. Flickinger, G. L. 1961. Effect of grouping on adrenals and gonads of chickens. Gen. Comp. Endocrinol. 1:332-340.
9. Guhl, A. M. 1953. Social behavior of the domestic fowl. Kansas State Agric Exp. Sta. Techn. Bull. 73:3-48, Manhattan, KS.
10. Hughes, B. O. 1975. The concept of optimum stocking density and its selection for egg production. Pages 271-298 in Economic Factors Affecting Egg Production. B. M. Freeman and K. N. Boorman, ed. British Poultry Science Ltd., Edinburgh.
11. Hughes, B. O., N. L. Carmichael, A. W. Walker, and P. N. Grigor. 1997. Low incidence of aggression in large flocks of laying hens. Appl. Anim. Behav. Sci. 54:215-234.
12. Hughes, B. O., and I. J. H. Duncan. 1972. The influence of strain and environmental factors upon feather pecking and cannibalism in fowls. Br. Poult. Sci. 13:525-547.
13. Keeling, L. J., R. C. Newberry, and I. Estevez. Effect of group size on behavioural synchronization in domestic fowl. Appl. Anim. Behav. Sci. (in press).
14. Newberry, R. C., I. Estevez, and L. J. Keeling. 2001 Group size and perching behaviour in young domestic fowl. Appl. Anim. Behav. Sci. 73:117-129.
15. Nicol, C. J., N. G. Gregory, T. G. Knowles, I. D. Parkman, and L. Wilkins. 1999. Differential effects of increased stocking density, mediated by increased flock size, on feather pecking and aggression in laying hens. Appl. Anim. Behav. Sci. 65:137-152.
16. Pagel, M., and M. S. Dawkins. 1997. Peck orders and group size in laying hens: 'futures contracts' for non-aggression. Behav. Proc. 40:13-25.
17. Tauson, R. 1998. Health and production in improved cage designs. Poult. Sci. 77:1820-1827.
18. Wegner, R. M. 1990. Experience with the get-away cage system. World's Poult. Sci. J. 46:41-47.