Factors Affecting Oxygen Uptake by Yeast Issatchenkia orientalis as Microbial Feed Additive for Ruminants

Lee, J. H.; Lim, Y. B.; Park, K. M.; Lee, S. W.; Baig, S. Y.; Shin, H. T.

doi:2003.16.7.1011

Article

Animal Breeding and Genetics

Asian-Australasian Journal of Animal Sciences 2003;16(7): 1011-1014.
https://doi.org/10.5713/ajas.2003.1011 Published online January 1, 2003.

Factors Affecting Oxygen Uptake by Yeast Issatchenkia orientalis as Microbial Feed Additive for Ruminants

J. H. Lee, Y. B. Lim, K. M. Park, S. W. Lee, S. Y. Baig, H. T. Shin

Abstract

The objective of this work was to evaluate a thermotolerant yeast Issatchenkia orientalis DY252 as a microbial feed additive for ruminants. In the present study, the influence of volatile fatty acids (VFA) and temperature on oxygen uptake rate by I. orientalis DY 252 was investigated. It was evident that the oxygen uptake rate was decreased gradually as the VFA concentrations increased in a range of 30 to 120 mM. Although the oxygen uptake rate was not greatly affected by temperature in the range 37 to 43째C, a maximum value of 0.45 mg O2/g cell/ min was obtained at 39째C. With regard to the oxygen uptake rate by yeast, viability was found to be less important than the metabolic activity of yeast.

Keywords: Issatchenkia orientalis; Oxygen Uptake Rate; Viability; Vitality; Volatile Fatty Acids; Yeast Culture