The mortality data of 95242 birds died from 1961 to 1996 were collected from the Poultry Farm, Rajasthan College of Agriculture, Udaipur. The effect of genetic groups on mortality pattern was highly signiticant. The mortality pattern in chicken was signiticantly affected by the season. The mortality in descending order was observed in summer, rainy, spring, winter and autumn seasons. The mortality varied signiticant between different age groups. In all 49.55% mortality occurred to 2 month of age while 27.02 and 23.43% of the total mortality during 2–5 and over 5 month of age respectively.
Signiticant higher number of birds were died during unsexed growing stage than adults i.e. male and female. The egg weight had no effect on mortality pattern in chicken while age of parent affected the mortality pattern signiticant. The mortality was signiticant higher in followers whose parental age was less than 8 months as compared to those whose age more than 8 months. More than 40% of the total deaths were observed due to Coryza followed by Chronic Respiratory disease, Enteritis, Avian Leucosis complex, Coccidiosis, Spirochactosis and Ranikhet diseases. While the mortality due to other causes were less than 4% of total deaths.
Non-genetic tactors, mortality, chicken
