The Effect of Live Yeast Supplementation on Beef Cattle Performance: A Systematic Review and Meta-Analysis

Abstract

This meta-analysis evaluates the effects of yeast supplementation (Saccharomyces cerevisiae) on dry matter intake (DMI) and average daily gain (ADG) in beef cattle. The inclusion criteria were complete and randomized trials and supplementation with yeast S. cerevisiae versus no supplementation to measure DMI or ADG. Data were extracted from relevant papers via pre-defined protocols. A meta-analysis of random effects was conducted for each indicator separately including the mean of the control and treated groups. The results were presented with the pooled mean difference (MD), 95% of confidence interval, and I² (percentage of total variation between studies that is due to heterogeneity rather than chance). A total of 12 publications reporting 22 trials conducted in 1,161 cattle were analysed. The heterogeneity between studies was high and ranged from 92 to 99%. No effects were observed in ADG with the inclusion of yeast in the diet (MD = -2.849 g/day, p = 0.492). However, there was a reduction in the DMI (MD = -0.885 kg/day; p = 0.023) despite the high heterogeneity among studies (I 2 = 92.4%; p < 0.001). The ADG increased when the forage level in the diet was between 30 and 50% (MD = 641.08 g/day; p = 0.001) and decreased when the level range from 51 to 75% (MD = -2.90 g/day; p < 0.001). In over 60% of the Neutral Detergent Fibre, the use of yeast in the diet decreased the ADG by 406.94 g/day (p = 0.034). Feedlot animals showed a reduction in the DMI (MD = -0.97 kg/day; p = 0.019) if supplemented with yeast. Supplementation with S. cerevisiae in the diet of beef cattle had no effect on ADG; however, it does improve the feed conversion due to the reduction in DMI.

Effects of dry yeast supplementation on growth performance, rumen fermentation characteristics, slaughter performance and microbial communities in beef cattle

“…In present study, cattle fed low plane of nutrition diet supplemented with ADY 4 g/head/d significantly increased ADG, and achieved to a comparable level with cattle fed with high plane of nutrition diet, which was in agreement with the research of Geng et al [18]. Previous studies have shown that the supplementation with ADY could increase ruminant animals DMI [19], however there were also some studies showed that DMI could be reduced [20,21]. Our results indicated that dietary supplementation with ADY had no significant effect on DMI, which was consistent with the result reported by Vyas et al [22].…”

Using ruminally protected and nonprotected active dried yeast as alternatives to antibiotics in finishing beef steers: growth performance, carcass traits, blood metabolites, and fecal Escherichia coli1

“…Yeast cell viability can be reduced during production, storage, and delivery as well as by the ruminal environment such as low pH when cattle are fed high-grain diets. Thus responses to ADY have been variable when it was used in animal studies (Sullivan and Bradford, 2011;Sartori et al, 2017). Fratianni et al (2014) found dramatic loss of yeast cell viability after 4 wk of storage at 4 °C, Table 3.…”

“…Feed intake responses of beef cattle to live yeast (LY) supplementation have been variable; some studies reported increased DMI (Robinson, 2010;Habeeb, 2017), whereas, other studies stated a reduction of DMI (Rodrigues et al, 2013;Sartori et al, 2017). Furthermore, there appears to be more studies that report no impact of LY supplementation on DMI than studies that report positive or negative effects (Beauchemin, 2012).…”

“…Nevertheless, the reduced ADG of steers fed EDY or MDY from day 29 to 56 was compensated from day 57 to 84, indicating fluctuation of growth performance throughout the finishing period. There are limited studies evaluating the effect of feeding LY on beef cattle growth performance in comparison with the considerable research that has been conducted with lactating dairy cows (Sartori et al, 2017). Lascano and Heinrichs (2007) concluded in a review that although results were highly variable, most studies reported limited influence of LY on DMI and ADG.…”

Utilização De Fungos Em Forrageiras E Na Alimentação De Ruminantes

“…Os frequentes incrementos dos custos da suplementação da dieta dos animais têm estimulado o interesse pelo aproveitamento de alimentos não convencionais na indústria de alimentação animal do Brasil (MONÇÃO et al, 2016a). Dentre os produtos que apresentam potencial de substituir os suplementos proteicos, por exemplo, e suprir os nutrientes deficientes nos pastos, destacam-se as algas, fungos filamentosos e, principalmente, leveduras obtidas a partir da fermentação da cevada e da cana-de-açúcar, considerados fonte de proteínas, além de apresentarem rápido crescimento e possibilidade de cultivo em vários tipos de substratos (SARTORI et al, 2017). ISSN: 2318-356X V.6 N.2 MAI/AGO 2018 A exploração desses microrganismos tornou-se evidente a partir da Segunda Guerra Mundial, época em que se tornaram escassos os alimentos ricos em proteínas e vitaminas.…”