Probiotic yeast: Mode of action and its effects on ruminant nutrition

Abstract

Provisional chapter© 2016 The Author(s). Licensee InTech. This chapter is distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/3.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. DOI: 10.5772/intechopen.70778Probiotic Yeast: Mode of Action and Its Eects on Ruminant NutritionShakira Ghazanfar, Nauman Khalid, Iftikhar Ahmed and Muhammad ImranAdditional information is available at the end of the chapterAbstractThe main purpose of yeast supplementation is to treat rumen microbial dysbiosis which may enhance the nutrient utilization leading to enhanced animal growth and productivity. Yeast improves rumen ecosystem by two ways: by direct production of digestive enzymes and growth stimulator and by promoting the growth and function of benecial microbiota. Yeasts have potential to produce metabolites, which stimulate the growth, like rumen acetogens and antimicrobial compounds which inhibit potential pathogens. The yeast probiotic impact on animals depend on dierent interacting factors including animal breed, supplemented dose, type, diet, strain, physiological stage and feeding system. In the situation of a high feed cost all over the world, probiotic yeast gives a useful nutritional strategy which allows increasing diet digestibility and consequently enhances the performance in ruminants in cost-eective manner. Many yeast culture-based products are commercially available world-wide, but their eectiveness as probiotic dietary supplement in a particular breed is mostly questionable. Therefore, exploration of the new indigenous probiotic strain is of great interest in this context. The probiotic strains of same ecological origin may be more compatible with rumen microbiome giving maximum outputs. Moreover, the breed specic probiotic yeast is an economical and viable option for farmers to overcome the eects of malnutrition.

Keywords: Indigenous probiotics, viability, stability, gastrointestinal tract, rumen microbiota