The various synthetic varieties of chicken evolved for Backyard rearing Viz., Rajasri, Vanaraja, Gramapriya and other exotic populations like pure RIR, Delham Red, Kadaknath along with the Native chicken, Aseel were utilized for conducting the Humoral and Cell mediated immune responses. The mean values of Haemagglutination titers estimated at 7th and 15th day of post inoculation of SRBC, expressed as log2 values among all the breeds under the study ranged from 2.07 to 5.48 and 0.65 to 2.85 respectively. The Rajasri breed is found to be significantly superior showing the higher HA titers values (5.48 and 2.85) at 7th and 15th day, compared to Gramapriya (3.38 and 2.74) and Vanaraja breeds (3.73 and 1.91). Among the pure lines these values were 2.60 and 0.65, 2.63 and 0.92 and 2.18 and 2.00 in RIR, Delham Red and Kadaknath breeds at 7th and 15th day of post inoculation respectively. Among the Native chickens Aseel breed has shown more titers (4.00 and 2.19), over the country chicken (3.84 and 1.00) at respective ages. Bantam breed recorded the titer value of 4.04 and 2.33 at 7th and 15th day of post inoculation. ILR-90 Jubilee (IWDxIWF) recorded lowest titer value (2.07) at 7th day among the breeds under testing. The cell mediated immunity values estimated as Foot pad index (mm) among different breeds ranged from 0.08 to 0.21mm. The correlations between HA-7 and FPI was positive and ranged from -0.32 to 0.65.
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