Evaluation of the heterophil/lymphocyte ratio as a measure of stress in chickens.

The number of lymphocytes in chicken blood samples decreased and the number of heterophils increased in response to stressors and to increasing levels of corticosterone in the chicken feed. The ratio of heterophils to lymphocytes was less variable than the number of heterophil or lymphocyte cells, and the range of values for this ratio was greater than the range of values for heterophils and lymphocytes among control and experimental groups. The heterophil/lymphocyte ratio appears to be a more reliable indicator of levels of corticosterone in the feed and to social stress than were the plasma corticosteroid levels.

[1]  S. Pb,et al.  Socialization as a factor in resistance to infection, feed efficiency, and response to antigen in chickens. , 1982 .

[2]  W. B. Gross,et al.  Long-term exposure of chickens to three levels of social stress. , 1981, Avian diseases.

[3]  P. Siegel,et al.  Agonistic behavior, the development of the social hierarchy and stress in genetically diverse flocks of chickens , 1980, Behavioural Processes.

[4]  H. S. Siegel.  Physiological Stress in Birds , 1980 .

[5]  W. B. Gross,et al.  Some effects of feeding deoxycorticosterone to chickens. , 1980, Poultry science.

[6]  B. Eskeland,et al.  Plasma Corticosteroid Levels in Laying Hens , 1979, Acta Veterinaria Scandinavica.

[7]  G. Beuving,et al.  Effect of stressing factors on corticosterone levels in the plasma of laying hens. , 1978, General and comparative endocrinology.

[8]  B. Murphy,et al.  Some studies of the protein-binding of steroids and their application to the routine micro and ultramicro measurement of various steroids in body fluids by competitive protein-binding radioassay. , 1967, The Journal of clinical endocrinology and metabolism.

[9]  W. B. Gross,et al.  Cell-mediated immunity in Marek's disease virus-infected chickens genetically selected for high and low concentrations of plasma corticosterone. , 1980, American journal of veterinary research.

[10]  W. B. Gross,et al.  Production and Persistence of Antibodies in Chickens to Sheep Erythrocytes. 1. Directional Selection , 1980 .

[11]  H. S. Siegel,et al.  Adrenal responses in high and low ACTH response lines of chickens during acute heat stress. , 1975, General and comparative endocrinology.