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Veterinaria México

versión impresa ISSN 0301-5092

Resumen

JUAREZ ESTRADA, Marco Antonio; MOLINA HERNANDEZ, Jessica Alejandra  y  GONZALEZ SOTO, Lourdes. Enhancement of competitive exclusion by a defined probiotic on Salmonella enterica serovar Enteritidis colonization during rearing of Leghorn chicks. Vet. Méx [online]. 2010, vol.41, n.1, pp.25-43. ISSN 0301-5092.

Competitive exclusion degree from a defined (DP) and undefined probiotic (UDP) administered to one-day Leghorn chicks and challenged with 1 x 108 CFU of Salmonella enterica serovar Enteritidis fagotype 13A (SE) was evaluated. Birds with DP at 20 day old showed 21.7% of SE positive isolates in liver-spleen (LS), less than 51.7% recorded from birds without any probiotic. In a second study, birds that received DP living together with a group inoculated with SE at third day old, showed 7.5% infection in LS at 13 day of age and 12.5% at 15 day. Whereas, SE inoculated group had 75% and 57.5% of SE isolates, respectively. A third group, living with the last two, without DP or SE showed 27.5% of SE in LS at 13 day, and only 10% at 15 day of age. DP group at 13 day of age, showed a decrease of 75% of SE colonization at cecal tonsils (CT), instead, SE inoculated group was 100% colonized; at 15 day of age, DP decreased 51.4% of SE colonization in CT, while control group showed a decrease of 42.5%, and 68.6% of SE in CT at 13 and 15 days, respectively. In a third study, a DP booster group was dosed three times, at 14 days of age, it had only 4.5% of SE isolates from LS. Birds without DP showed 34.6% of SE isolates, and the group inoculated with only one dose had 17.2% of SE positive birds. DP booster group showed 22.7% of SE in CT, the group with one dose had 62% of SE isolates; birds without DP decreased only 3.9% of SE colonization. DP showed greater margin of protection, decreased horizontal transmission of SE PT13A in LS and CT, and it has good transmission potential. DP booster treatment was better than only one dose. DP is a good alternative for SE prevention and eradication in commercial poultry.

Palabras clave : Competitive Exclusion; Food Safety; Foodborne Illness; Probiotics; Newly Hatched Chicks.

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