High output farming practices require a higher plane of nutrition, which typically includes increased levels of fermentable carbohydrates. This can put the animal at risk of developing metabolic disorders, in particular, challenges to rumen stabilityand sub-acute rumen acidosis (SARA). Traditionally, specific live yeasts have been used to overcome rumen challenges by increasing rumen pH to optimal levels in situations such as feed transition (weaning, grazing, step-up feeding programs) or during periods of stress (high temperatures and transportation).Recent research has demonstrated that specific live yeast can have a beneficial impact on fibrolytic microbial populations and digestibility of the fibre proportion of the diet. The live yeast is a valuable tool which allows maximisation of the diet, giving the farmer and nutritionist the possibility to either increase milk or meat revenue per kg of feed, or to optimise feed cost with similar revenue. Such technology can be particularly useful in maximising energy from the feed. Modelling the quantitative response of live yeast on rumen pH and fibre degradation in a feed formulation programme, can allow nutritionists and farmers to formulate for improved feed efficiency and income over feed cost (IOFC).
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