Effect of the addition of a yeast hydrolysate on in vitro rumen fermentation of two diets | Efecto de la adición de un hidrolizado de levadura sobre la fermentación ruminal in vitro de dos dietas
2009
Saro, C., Universidad de León (España). Facultad de Veterinaria | Pérez, M. | Martínez, M.E., Universidad de León (España). Facultad de Veterinaria | Ramos, S., Universidad de León (España). Facultad de Veterinaria | Tejido, M.L., Universidad de León (España). Facultad de Veterinaria | Ranilla, M.J., Universidad de León (España). Facultad de Veterinaria | Carro, M.D., Universidad de León (España). Facultad de Veterinaria
Batch cultures of mixed rumen microorganisms were used to study the effects of a yeast hydrolysate from S. cerevisiae (LEV) on the in vitro fermentation of two sheep diets (milk and fattening). In 16 h incubations, LEV increased (P<0.05) total VFA and butyric production, and tended (P<0.10) to increase acetic production for fattening diet. For milk diet, LEV tended (P<0.10) to decrease propionic production, and significantly increased (P<0.05) the acetic/propionic ratio. Gas production and ammonia concentration were increased (P<0.05) by LEV for the fattening diet. Methane production and pH were unaffected by LEV treatment. The results show that LEV stimulated in vitro ruminal fermentation when a high concentrate diet (fattening) was incubated, but no effects were detected for a more fibrous (milk) diet.
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