A total of 100 cells each were counted for Heterophils and lymphocytes (Gross and Siegel, 1983) and then calculated Heterophil/lymphocyte ratio
Blood samples were collected randomly from 10 chickens of each group at ages 15, 25 and 35 days old to measure WBCs DC (heterophils, lymphocytes, monocytes, eosinophils and basophils), also heterophil/lymphocyte ratio
(H/L ratio) were measured.
Haematological traits are genetically controlled and considered as a tool to detect onset of any health problem or disease condition  particularly circulating lymphocytes and heterophil/lymphocyte ratio
could be used for diagnosis as well as in breeding programs for genetic up gradation of poultry .
Siegel, Evaluation of the heterophil/lymphocyte ratio
as a measure of stress in chickens.
Genetic resistance to almonella typhimurium in two lines of chickens selected as resistant and sensitive on the basis of the heterophil/lymphocyte ratio.
Mean ([+ or -]SEM) heterophil/lymphocyte ratios (HLR) in broiler chickens where feeding regimen by housing system interactions were significant Housing system Feeding regimen OH CH AL 0.
Blood samples were drawn in 3 ml disposable sterile syringes containing EDTA from 25 birds in each treatment group at the age of 36th day at 18 hour for determining the TLC, DLC and the Heterophil/lymphocyte ratio
as per procedure described by Benjamin  and Gross .
Venous blood gas partial pressures, pH, bicarbonate and lactate concentrations, packed cell volume, white blood cell differential counts, and heterophil/lymphocyte ratios
were measured from mourning doves (Zenaida macroura), boat-tailed grackles (Quiscalus major), and house sparrows (.
13) The heterophil/lymphocyte ratios
observed in untrained Harris' hawks (Parabuteo unicinctus) and peregrine falcons after the stress of transportation showed a significant increase but still remained within reference ranges for those species.