Abstract
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.
Highlights
Yeast products are widely utilized as feed additives for ruminant animals in many parts of the world There is a widespread belief among dairy and beef producers and ruminant nutritionists that yeast products are beneficial by enhancing feed intake and overall animal performance and is safe tool for enhancing ruminant production and safeguarding health [1]
The alternate mechanism is that it is the yeast culture itself, which is created in the yeast fermentation process, which provides a mixture of micro-nutrients to stimulate bacterial growth in the rumen thereby facilitating increased fermentation of fiber and/or
Jouany [29] decided that a positive effect of yeasts on the performance of dairy cows and on the content of milk components resulted from increased daily feed intake and improved digestibility of nutrients
Summary
Yeast products are widely utilized as feed additives for ruminant animals in many parts of the world There is a widespread belief among dairy and beef producers and ruminant nutritionists that yeast products are beneficial by enhancing feed intake and overall animal performance and is safe tool for enhancing ruminant production and safeguarding health [1]. Alsaied Alnaimy Mostafa Habeeb: Importance of Yeast in Ruminants Feeding on Production and Reproduction utilization of end products of fiber fermentation to prevent their accumulation in the rumen Supporters of this theory point to a limited research base showing that when cultures of live brewers or fermentation yeasts are fed to ruminants, there are few, if any, changes to rumen fermentation and/or animal performance [5]. Live yeast supplemented to pellet ration for help controlling digestive problems in animals and to stabilize the micro flora in the gut, improving the fiber digestion, which means better overall feed utilization and a healthier gut because animals required higher fiber diets i.e. higher calorie diets for young, growing or lactating animals for enhanced health vitality [8]. The objective of this article is to summarize studies that have been published in the scientific literature that have examined the impact of yeast on rumen fermentation, fiber digestion and productive and reproductive performance of farm animals
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