Pandian, C.Omprakash, A.V.Sundaresan, A.Babu, M.TANUVAS2016-07-182016-07-182013-05http://krishikosh.egranth.ac.in/handle/1/68880In layer type chicken during brooder and grower periods, mortality due to omphalitis was high and significantly influenced by season. Incidences of omphalitis, pneumonia and coccidiosis were also significantly influenced by season. Omphalitis was highest in summer while hepatitis, pneumonia and coccidiosis were highest in winter. During laying period, the mortality due to egg peritonitis, FLHS and hepatitis were higher during monsoon. Heat stroke was significantly high during summer than in southwest monsoon and absent during northeast monsoon and winter. Winter had significantly higher incidence of enteritis resulting in higher mortality than northeast monsoon.enArticle