author(s)
MP Madhavatar, KJ Ankuya, HD Chauhan, AK Srivastava, AB Chaudhari, JV Patel, NK Thakkar and HR Joshi

abstract
A study was undertaken to ascertain the causes of mortality pattern in 201 poultry birds. The data were collected over of total six years (2012 to 2018). The post mortem examination were carried out at Department of Veterinary Pathology, College of Veterinary Science and Animal Husbandry, Sardarkrushinagar Dantiwada Agricultural University, Sardarkrushinagar. Fatty liver hemorrhagic syndrome (17.41%) found to be primary cause of death along with heat stroke (9.95%), necrotic hepatitis (9.45%), fatty liver (8.45%), nephritis (6.96%), autolysis (5.47%), hepatitis (3.98%), pneumonia (3.48%), gout (2.48%), visceral gout (2.48%), yolk sac infection (1.49%) and septicemia (1.49%). Age wise incidence of the disease revealed that Layers (>20wks) were more susceptible to fatty liver haemorrhagic syndrome (16.41%), fatty liver (6.96%), heat stroke (6.96%), necrotic hepatitis (4.97%), nephritis (2.98%). Mortality in growers were due to Nephritis (3.98%), necrotic hepatitis (2.98%), autolysis (1.99%), septicemia (1.49%) followed by enteritis (1.49%) and granulomatous pneumonia with enteritis (0.99%). Mortality in chicks phase was due to nephritis (3.98%), necrotic hepatitis (3.48%), autolysis (2.48), enteritis (1.99%), yolk sac infection (1.49%). Seasonal influences on mortality in layer type chickens showed significantly (p<0.01) highest mortality during summer (58.70%) followed by monsoon (27.86%) and winter (13.43%) months. Liver associated diseases like fatty liver haemorrhagic syndrome and fatty liver were found to be highest.