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2016, Número 3

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AbanicoVet 2016; 6 (3)


Comportamiento de Escherichia coli en heces de vacas adicionadas con taninos hidrolizables

Heras-Sierra T, Enríquez-Verdugo I, Gaxiola-Camacho S, Romo-Rubio J, Anne-Marie P, Barajas-Cruz R

Idioma: Español
Referencias bibliográficas: 21
Paginas: 47-54
Archivo PDF: 186.44 Kb.


RESUMEN

Para evaluar el comportamiento de E. coli en heces de vacas lecheras adicionadas con taninos hidrolizables, se llevó a cabo un experimento en el que alícuotas de 100 g de heces fueron asignadas de manera aleatoria a uno de dos niveles (0 y 10%) de taninos hidrolizables (TH), uno de tres valores de pH: 5.2, 6.5 y 8.3 y cultivados a: 0, 2, 6, 9, 15, 22 y 30 días una vez adicionados los taninos. Las heces adicionadas con 10% de TH presentaron mayor crecimiento (P ‹ 0.01) de E. coli comparadas con las que no se les agregó TH (Log10 5.071 vs. Log10 4.401). Las heces con pH 6.5 tuvieron valores menores (P ‹ 0.01) de E. coli (Log10 4.525) vs. pH de 5.2 (Log10 4.866) y pH 8.3 (Log10 4.816). En todos los casos el crecimiento de E. coli disminuyó (P ‹ 0.01) conforme se incrementaron los días (Log10 = 5.51 el día 0; Log10 = 3.36 en el día 30). Los resultados sugieren que los TH no inhiben el crecimiento de E. coli en las heces de las vacas, sin embargo a valores de pH cercanos a la neutralidad el crecimiento de E. coli en heces disminuye.


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