Effects of Strains of Saccharomyces cerevisiae and Incubation Conditions on the In vitro Degradability of Yeast and Roughage

  • Ando, S. (Department of Livestock and Grassland Science, National Agricultural, Research Center for Western Region) ;
  • Nishiguchi, Y. (Department of Livestock and Grassland Science, National Agricultural, Research Center for Western Region) ;
  • Hayasaka, K. (Department of Livestock and Grassland Science, National Agricultural, Research Center for Western Region) ;
  • Yoshihara, Y. (Shimane Prefectural Animal Husbandry Experiment Station) ;
  • Takahashi, J. (Department of Animal Science, Obihiro University of Agriculture and Veterinary Medicine) ;
  • Iefuji, H. (Nationl Research Institute of Brewing)
  • Received : 2004.05.05
  • Accepted : 2004.11.09
  • Published : 2005.03.01


The in vitro degradability of yeast and the effect of yeast on the in vitro degradability of forage may differ in terms of the specific yeast strains or their incubation conditions. Thus in experiment 1, two strains of sake yeast (strainK7 and strainK9) and one strain of bakers' yeast (KY5649) were incubated in an aerobic condition. In experiment 2, aerobically or anaero bically incubated K7 was used for investigating the in vitro degradability of yeast, the effect of yeast on the in vitro degradability of forage, and the degradability of yeast by pepsin and pronase treatment. The in vitrodegradability of bakers' yeast was significantly (p<0.05) higher than those of sake yeasts. The in vitro degradability of anaerobically incubated yeast was significantly (p<0.01) higher than that of aerobically incubated yeast. The degradability of bakers' yeast by pepsin treatment was significantly (p<0.01) higher than that of the sake yeasts. The degradability of bakers' yeast by pronase treatment was slightly higher than that of the two sake yeasts, while the degradability of anaerobically incubated yeast by both enzymes, respectively, was significantly (p<0.01) higher than that of aerobically incubated yeast. The degradability of forages was increased significantly (p<0.05) by the addition of yeasts. The degradability of roughage by sake yeast tended to be higher than that by the bakers' yeast. The degradability of roughage was significantly (p<0.05) higher by anaerobically incubated yeast than by aerobically incubated yeast. Given the above results, it seems that in vitro degradability of yeast and the magnitude of the increment of roughage degradation differ among the yeast strains and their incubation conditions.


Yeast;Degradability;Rice-straw;Italian-ryegrass;Sorghum Incubation-condition


  1. Ando, S., R. I. Khan, J. Takahasi, Y. Gamo, R. Morikawa, Y. Nishiguchi and K. Hayasaka. 2004. Manupulation of rumen fermentation by yeast: The effects of dried beer yeast on the in vitro degradability of forages and methane production. Asian-Aust. J. Anim. Sci. 17:68-72.
  2. Cid, V. J., A. Duran, F. Rey, M. P. Snyder, C. Nombela and M. Scachez. 1995. Molecular basis of cell integrity and morphogenesis in Saccharomyces cervisiae. Microbial Reviews, American Society of Microbiology 59:345-386.
  3. Moir, K. W. 1972. The different extraction procedures on the recovery of cell walls in forages and feces from cattle and sheep. J. Agric. Sci (Cam) 78:351-353.
  4. Williams, J. E., S. Grebing, S. J. Miller and L. Gieseke. 1987. The influence of supplemental yeast culture and sodium bicarbonate on performance and blood acid-base status in wether lambs exposed elevated ambient temperature. J. Anim. Sci. 65(Suppl.1):156.
  5. Dawson, K. A. and D. M. Hopkins. 1991. Differential effects of live yeast on the cellulolytic activities of anaerobic rumen bacteria. J. Anim. Sci. 69(Suppl.1):531.
  6. Inoue, T., H. Iefuji, H. Soga and K. Satoh. 2000. Cloning and characterization of a gene complementing the mutation of an ethanol-sensitive mutant of sake yeast. Biosci. Biotechnol. Biochem. 64:229-236.
  7. Tilley, J. M. A. and R. A. Terry. 1963. A two-stage technique for the in vitro digestion of forage crops. J. Br. Grassl. Soc. 18:104-111
  8. Abe, A., S. Horii and K. Kameoka. 1979. Application of enzymatic analysis with glucoamylase, pronase and cellulase to various feeds for cattle. J. Anim. Sci. 48:1483-1489.
  9. Nisbet, D. J. and S. A. Martin. 1991. Effect of Saccharomyces cerevisiae culture on lactate utilization by ruminal bacterium Selenomonas rumininantium. J. Anim. Sci. 69:4628-4633.
  10. Ogawa, Y., A. Nitta, H. Uchiyama, T. Imamura, H. Shimoi and K. Ito. 2000. Tolerance mechanism of the ethanol-tolerant mutant of sake yeast. J. Biosci. Bioeng. 90:313-320.
  11. Dunnet, C. W. 1955. A multiple comparison procedure for comparing several treatments with a control. J. Am. Statis. Assoc.59:161-168.
  12. Harrison, G. A., R. W. Hemken, D. A. Dawon and K. B. Barker. 1988. Influence of addition of yeast culture supplement to diets of lactating cows on ruminal fermentation and microbial populations. J. Dairy Sci. 71:2967-2975.
  13. Hara, M., H. Mizoguchi, T. Obata, Y. Iimura, A. Totsuka and K. Noshiro. 1978. Isolation of an ethanol-tolerant mutant of sake yeast using live yeast-dissolving enzymes. J. Brew. Soc. Japan 73:408-411 (In Japanese).
  14. Dawson, K. A., K. E. Newman and J. A. Boling. 1990. Effects of microbial supplements containing yeast and lactobacilli on roughage fed ruminal microbial activities. J. Anim. Sci. 68:3392-3398.
  15. Erasmus,.L. J., P. M. Botha and A. Kistner. 1992. Effect of yeast culture supplement on production, rumen fermentation, and duodenal nitrogen flow in dairy cows. J. Dairy Sci. 75:3056-3065.
  16. Morrison, I. M. 1973. The isolation of plant cell wall preparations with low nitrogen contents. J. Agric. Sci. (Cam) 80:407-410.
  17. Yoon, I. K. and M. D. Stern. 1995. Influence of direct-fed microbials on ruminal microbial fermentation and performance of ruminants: A review. Asian-Aust. J. Anim. Sci. 8:535-555.
  18. Piva, G., S. Belladonna, G. Fusconi and F. Sicbaldi. 1993. Effects of yeast on Dairy cow performance, ruminal fermentation, blood components, and milk manufacturing properties. J. Dairy Sci. 76:2717-2722.
  19. Wiedmeier, D., M. J. Arambel and J. L. Walters. 1987. Effect of yeast culture and Aspergillus oryzae fermentation extract on ruminal characteristics and nutrient digestibility. J. Dairy Sci. 70:2063-2068.
  20. Fallon, R. J.and F. J. Harte. 1987. The effect of yeast culture inclusion in the concentrate diet on calf performance. J. Dairy Sci. 70(Suppl.1):143.

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