Benefits of yeast supplements for ruminants are shifts in microbial population numbers and species, favorable changes in volatile fatty acids contents of rumen, positive effects on rumen ammonia disappearance, positive effects on rumen pH, promotes metabolism digestion, increase in fiber digestibility and changes in microbial protein and amino acids in large intestine. In addition, benefits of Yeast supplements for ruminants are improving the overall intestinal bacteria balance, reducing digestive problems, lower risk of acidosis and reduction in the humidity of bedding resulting in lower stress levels. Feeding on feed mixture contained Active dry yeast (ADY) improved the appetite of animals which lead to increase the feed intake and consequently increased the daily weight gain of the treated animals. From the physiological point of view, adding ADY caused significant increase the levels of both T4 and T3 hormones which lead to increase the protein and fat biosyntheses. Moreover, benefits of yeast supplements for ruminants are increased milk production and improvements in milk quality, improves milk selenium content, reduced mastitis and somatic cell count, less stillbirths, weak neonates, improves fertility, reduced incidence of retained placenta, improved immune response, increases immune resistance, high content in B-vitamins and trace elements, enhances weight gain and feed utilization.
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