Protection of Salmonella infection in chicks by competitive exclusion

Competitive Exclusion-products (CE-Products) were prepared from cecal content of Salmonella-free chickens in anaerobic condition. These chickens were 7-week-old broilers and 5-month-old layers. CE-product from each type of chicken was given to Salmonella-free day-old broiler chicks by spraying, crop gavaging or drinking water. Salmonella enteritidis was given at 3-day-old. S. enteritidis isolation was attempted from cecum of necropsied birds at-9-day-old. The isolation rate of S. enteritidis from birds receiving CE-product which prepared from broilers by spraying and crop gavaging was higher than the ones receiving CE-product which prepared from layers by the same method of administration. Birds receiving CE-product which prepared from layers by crop gavaging were highest protected against S. enteritidis colonization. But birds receiving CE-product which prepared from broilers by spraying were lowest protected against S. enteritidis colonization. CE-products which prepared from Salmonella-free 5-month-old layers was given to Salmonella-infected day-old broilers by spraying or crop gravging. S. enteritidis was given at 3-day-old S. enteritidis isolation was attempted from cecum of necropsied birds at 9-day-old. Birds receiving CE-product by crop gavaging were highest protected against S. enteritidis colonization and significantly higher than birds which did not receive CE-product but received S. enteritidis. CE-product which prepared from Salmonella-free 5-month-old layers was given to Salmonella-infected day-old broilers by spraying. S. enteritidis was given at 3 and 9-day-old. S. enteritidis isolation was attempted from cecum of necropsied birds at 9-, 21-, 29- and 42 day-old. The rate of S. enteritidis isolation at 9-and-21-day-old from birds receiving CE-product was lower than birds which did not receive CE-product and received S. enteritidis. The rate of S. enteritidis isolation at 21- and 42-day-old from birds which received S. enteritidis one or two times was not different. But the rate of S. enteritidis isolation at 29-day-old from birds which did not receive CE-product and received S. enteritidis 2 times was higher than birds which received S. enteritidis only one time and birds which received CE-product. The rate of S. enteritidis isolation was not different at 42-day-old.