Pathological and Apoptotic Studies of Oviduct in Layers with E. coli Salpingoperitonitis
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Date
2022
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Abstract
The reproductive system of female layer chicken was targeted by many infectious agents and causes oophoritis and salpingitis which results in drop in egg production. Bacterial agents cause egg drop by causing either salpingitis or salpingoperitonitis. The present study was undertaken to identify the pathological changes in oviduct in layer chicken with salpingoperitonitis. Heart blood, peritoneum and oviduct swabs were collected from affected chicken and screened for bacterial agents and representative tissue samples were collected in 10% NBF for histopathology and apoptosis. Out of 20 flocks, the E.coli alone was detected in 11 (55%) and remaining 9 flocks showed combined infection. The clinical signs of pale, shrunken comb and wattles, dullness and drop in egg production with more number of small eggs (5-7%) were noticed. The mortality rate of 1.2-2% could be recorded. Post mortem lesions recorded were thickened peritoneum with presence of milky fluid to caseous flakes and insipissiated yolk in the abdominal cavity. Oviduct showed marked thickening and lumen contained albuminous exudate to caseous flakes in the magnum and isthmus and thin shelled stained eggs covered with greyish yellow fibrin exudate in uterus and vagina. Histopathologically, all parts of oviduct showed degenerative and inflammatory changes. Apoptotic cells were seen in all parts of the oviduct. Apoptosis was more in magnum, uterus and vagina.
HIGHLIGHTS
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Gross and histopathologically, oviduct was severely damaged by E.coli.
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Oviduct showed large numbers of TUNEL positive apoptotic cells in the oviduct which indicates that E.coli act as powerful stimulant of apoptosis.