Effect of Breed, Coccidial Dosage and their Interaction on Body Weight Gain and Oocyst Outputs against Eimeria tenella Infection in Two Broiler Strain of Chicken

The research work was planned on 120 unsexed day old broiler chicks, sixty each of Cari Vishal and Cobb broiler chicken to notice the effect on body weight gain and oocyst outputs against E. tenella infection. The effect of dosage of coccidial challenge was found to be significant (P<0.05) only at 4^th week of age among treatment groups. The least squares mean (LSM) for body weight (g) differed significantly among two genetic groups from 0 to 8 week of age. Significantly (P<0.05) lower body weight gain was recorded in the birds of T₂ group at 4 week of age as compared to control and T₁. The difference was found to be significant in birds between control _{and T2 group from 5^th to 8^th week of age, while it was non significant between T1 and T2 groups. The mean OPG was significantly (P<0.05) higher in Cobb birds than Cari-Vishal birds from days 5 to 9 post infection (pi). The mean OPG count was noticed significantly higher in Cobb as compared to Cari-Vishal. The mean OPG count of T1 and T2 groups differed significantly (P<0.05) at day 7, 8 and 9 pi in Cobb and at day 5, 6, 8 and 9 in Cari-Vishal while it was non-significant at days 5 and 6 pi in Cobb and day 7 in Cari-Vishal.}