Chalupa, W. 1977. Manipulating Rumen Fermentation. J. Anim Sci. 46:583-599.
Dawson, K. A. and D. M. Hoppkins. 1991. Differential effects of live yeast on cellulolytic activity of anaerobic ruminal bacteria. J. Anim. Sci. 69(Suppl.1), 531.
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.
Fallon, R. J. and F. J. Harte. 1987. The effects of yeast culture inclusion in the concentrate diet on calf performance. J. Dairy Sci. 70(Suppl.1):143.
Gamo, Y., M. Mii, X. G. Zhou, S. Chetra, B. Santoso, I. Arai, K. Kimura and J. Takahashi. 2001. Effects of lactic acid bacteria, yeasts and galactooligosaccharide supplementation on in vitro rumen methane production. Greenhouse Gases and Animal Agriculture 371-374.
Harrison, G. A., R. W. Hemken, K. A. Dawon and K. B. Baker. 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.
Hungate, R. E. 1966. The Rumen and its Microbes. Academic Press, New York.
Jonhnson, K. A. and D. E. Johnson. 1995. Methane emission from cattle. J. Anim. Sci. 73:2483-2492.
Newbold, C. J., R. J. Wallace, X. B. Chen and F. M. McIntoch. 1995. Differrent strains of Saccharomyces cerevisiae differ in their effects on ruminal bacterial numbers in vitro and in sheep. J. Anim. Sci. 73:1811-1818.
Nisbet, D. J. and S. A. Martin. 1991. Effect of Saccharomyces cerevisiae culture on lactate utilization by ruminal bacterium by the ruminal bacterium Selenomonas rumininantium. J. Anim. Sci. 69:4628-4633.
Orskov, E. R. and I. McDonald. 1979. The estimation of protein degradability in the rumen from incubation measurements weighted according to rate of passage. J. Agric. Sci. (Camb) 92:499-503.
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.
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.
Wiedmeier, R. 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.
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 to elevated ambient temperature. J. Anim. Sci. 65(Suppl.1):156.
Willams, P. E. V., C. A. G. Tait, G. M. Innes and C. J. Newbold. 1991. Effects of The inclusion of yeast culture (Saccharomyces cerevisiae plus growth medium) in the diet of dairy cows on milk yield and forage degradation and fermentation patterns in the rumen of steers. J. Anim. Sci. 69:3016-3026.
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. 8:533-555.