author(s)
Anand Singh, SP Singh, MM Farooqui, Ajay Prakash, A Pathak, Renu Yadav and Anamika Sharma

abstract
The study was conducted on the bursa of Fabricius of 30 Chabro birds. The birds were selected after hatching irrespective of the sex and divided into five groups (0, 30, 60, 90, and 150) days of age. The bursa was located on the dorsal aspect of cloaca. The shape of the bursa was oval and it was creamy white color. Luminal surface of the bursa was occupied by number of large and small folds called plicae. The significant increase in body weight with age advances. The weight, length, width, thickness and plical (length and height) increased significantly up to 4th group and then decreased while plical width start decreasing from 3rd group onwards. The bursal index significantly increased in 1st and 2nd group and then start decreasing and significantly decreased in 4th and 5th group. It is conclude that after 4th group involution in bursa take place in chabro bird.