Addition of Active Dry Yeast Could Enhance Feed Intake and Rumen Bacterial Population While Reducing Protozoa and Methanogen Population in Beef Cattle

Abstract

Urea–lime-treated rice straw fed to Thai native beef cattle was supplemented with dry yeast (DY) (Saccharomyces cerevisiae) to assess total feed intake, nutrient digestibility, rumen microorganisms, and methane (CH4) production. Sixteen Thai native beef cattle at 115 ± 10 kg live weight were divided into four groups that received DY supplementation at 0, 1, 2, and 3 g/hd/d using a randomized completely block design. All animals were fed concentrate mixture at 0.5% of body weight, with urea–lime-treated rice straw fed ad libitum. Supplementation with DY enhanced total feed intake and digestibility of neutral detergent fiber and acid detergent fiber (p < 0.05), but dry matter, organic matter and crude protein were similar among treatments (p > 0.05). Total volatile fatty acid (VFA) and propionic acid (C3) increased (p < 0.05) with 3 g/hd/d DY supplementation, while acetic acid (C2) and butyric acid (C4) decreased. Protozoal population and CH4 production in the rumen decreased as DY increased (p < 0.05). Populations of F. succinogenes and R. flavefaciens increased (p < 0.05), whereas methanogen population decreased with DY addition at 3 g/hd/d, while R. albus was stable (p > 0.05) throughout the treatments. Thus, addition of DY to cattle feed increased feed intake, rumen fermentation, and cellulolytic bacterial populations.

Active dry yeast supplementation benefits ruminal fermentation, bacterial community, blood immunoglobulins, and growth performance in young dairy goats, but not for intermittent supplementation

“…As in previous studies ( Bayat et al., 2015 ; Phesatcha et al., 2021 ), we found an increase in DMI with ADY supplementation. In ruminants, the dietary fiber content and fiber digestibility greatly influence DMI ( de Souza et al., 2019 ).…”

Meta-analytic effect of Saccharomyces cerevisiae on dry matter intake, milk yield and components of lactating goats

“…Although the mechanism by which SC improves milk yield and components in lactating goats is not well known. The moderate positive effect of SC supplementation on milk yield in lactating goats might be related to the ability to enhance the growth of cellulolytic bacteria in the rumen, leading to an increase in total ruminal VFAs and propionate (C3) levels while decreasing acetate (C2), butyrate (C4) and the C2 to C3 ratio (46). In a similar study on cows, Zhang et al (47) found that dietary propionic acid had a positive effect on milk performance characteristics.…”

Effect of yeast (S.cerevisiae) fermented sugarcane bagasse and concentrate on nutrient intake, digestibility, and growth performance of sheep

“…Sartori et al stated that the highest total intake and average daily gain were observed in cattle supplemented with yeast [27]. e addition of dry yeast at 3g/animal/day improved total feed intake, rumen fermentation, and total bacteria populations while reducing protozoal population and methane (CH ) production in beef cattle fed with urea-urea-lime-treated rice straw [28]. ey observed that cattle fed a low plane of nutrition diet supplemented with yeast signi cantly increased average daily gain and achieved a comparable level with cattle fed with a high plane of nutrition diet, which also agrees with Geng et al [29].…”