The global feed yeast market size was estimated at USD 2.1 Bn in 2021, growing at a CAGR of 4.8 % during the forecast period 2022-2028. Yeasts are used in the animal nutrition to improve digestion of the animal. Yeasts help to maintain animal health by enhancing the immunity of animal. The most commonly used yeast is the Saccharomyces cerevisiae in animal feed industry. The nutritional components of yeast help in the metabolism of proteins, carbohydrates, and lipids in animals. Animal feed yeast products are classified into direct feed microbials which include live yeast, products with S.cerevisae with or without lie organisms, and other fungal derivatives of Aspergillus prize and Aspergillus niger. It is growing at a significant CAGR owing to increase in the demand for quality livestock products by the consumers. Ban on antibiotic growth promoters leads to increase in the consumption of feed yeast products, which is a key factor for the revenue growth of market. Low cost of the live yeast products, beneficial effects of improve gut flora of livestock and increase the livestock productivity are driving the market. Moreover, increase in the protein-rich meat products, a rise in R&D activities for the development of newer feed yeast products, an increase in the industrialization of poultry sector immensely boosts the feed yeast market over the forecast period. In addition, acquisitions and mergers, collaborations, product approvals, and product launchings are the factors responsible for the growth of the market. For instance, in October 2015, BEC Feed Solutions launched Hilyses, a Saccharomyces cerevisiae yeast fermented feed additive into the Australian market.