SciELO - Scientific Electronic Library Online

vol.42 número2Genetic variation within and among three ostrich breeds, estimated by using microsatellite markersWithdrawal or reduction of the dietary vitamin premix on bone parameters of broiler chickens in two rearing systems índice de autoresíndice de materiabúsqueda de artículos
Home Pagelista alfabética de revistas  

Servicios Personalizados



Links relacionados

  • En proceso de indezaciónCitado por Google
  • En proceso de indezaciónSimilares en Google


South African Journal of Animal Science

versión On-line ISSN 2221-4062
versión impresa ISSN 0375-1589


GHASEMI, E.; KHORVASH, M.  y  NIKKHAH, A.. Effect of forage sources and Saccharomyces cerevisiae (Sc 47) on ruminal fermentation parameters. S. Afr. j. anim. sci. [online]. 2012, vol.42, n.2, pp.164-168. ISSN 2221-4062.

Diet composition has been suggested as a factor that influences the variability of responses when Saccharomyces cerevisiae (SC) is fed to ruminant animals. Diets based on lucerne hay (462 g/kg DM) and maize silage (488 g/kg DM) were fed to determine the effects of 0 or 5 g SC 47 (8x109 cfu/g) on ruminal digestion, fermentation and protozoa population. Ruminal pH, acetate, propionate, degradation rate and effective degradability were significantly affected by the forage sources. The addition of SC caused an increase in degradability of forage neutral detergent fibre (NDF), and tended to enhance degradability of total diet organic matter (OM), and the concentration of propionate and result in a decrease in protozoa numbers at 3 h post feeding. Ruminal crude protein degradation, ammonia-N concentration, acetate : propionate ratio and pH were not elicited by the addition of SC. Although the ruminal environment was significantly affected by the forage sources, no interaction between SC and forage sources occurred for ruminal digestion parameters: pH, ammonia-N and protozoa populations. However, compared with the maize silage, the SC increased the initial degradability (3 h after feeding) of forage NDF (4.6% vs. 1.7%), total diet OM (3.1% vs. 1.0%) and crude protein (CP) (5.5% vs. 0.1%) to higher proportions for lucerne hay. Moreover, acetate concentration was increased on the diet based on maize silage and decreased on the diet based on lucerne hay with supplementation of SC. Although ruminal environments were considerably altered by the forage sources, the SC exhibited a transitory effect (3 h post feeding) without overall improvement on ruminal digestion and fermentation; nevertheless, this observation was more pronounced for lucerne-based diet.

Palabras clave : Rumen degradability; fermentation; protozoa; forage sources.

        · texto en Inglés     · Inglés ( pdf )


Creative Commons License Todo el contenido de esta revista, excepto dónde está identificado, está bajo una Licencia Creative Commons