Irfan Ullah Khan

A Study On The Effect Of Experimentally Induced Caecal Coccidiosis On Weight Gain Haematological Parameters In Broilers - 1999

The study was designed to observe the effect of experimentally induced coccidiosis on weight gain, FCR and somc blood parameters in broilers. For this purpose 90 day old broiler chicks were obtained from a local hatchery and reared under controlled managemental, coccidia free conditions upto 42 days of age. A commercial coccidiostat free feed and water were provided ad Jib. The birds were divided into three groups A, 13 and C, comprising of 30 birds each. The birds in group A were kept as non-infected, un-medicated control, the group B as infected and unniedicated, while group C as infected and treated with salinomycin (Coxistac 6%; Pfizer). Coxistac 6% at a doze rate of 50 grams per feed bag was provided and the resufts were studied. The chicks of group 13 and C were given oral dozes of 40,000 sporulated oocysts of jjmeria ej.eJi at the age of day 20 and 35.

There was no oocyst excretion in faeces of birds in group A, OPG of faeces in group B was higher than in group C. The OPG of faeces reached the peak during 2nd week post-infection in both the infected groups. 'Phe higher mortalit.y in the infected group 13 (20%) than in group-C (1 0%) was observed, while no mortality was recorded in group A. On postmortem it was observed that the caeca were swollen, on incision petcchial hacmorrhagcs were seen on walls of the caeca and lungs and liver of the infected carcasses were dehydrated and pale.

The group A showed highest weight gain than groups B and C. however, the group C (infected treated) showed better weight gains than group 13 (Infected). Feed conversion ratio in groups A, 13 and C were significantly different. Group A being uninfected gave the best FCR followed by birds in group C, which were medicated while birds in group B gave the poorest values.

The haemoglobin and TEC values in the infected group B were low and were normal for group A. However, the birds of group C also showed lower values as compared to group A. It was observed that the percentage of heterophils and monocytes increased, while the number of lymphocytes, basophils and eosinophils decreased in the blood of the infected groups.



Department of Parasitology

0603,T


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