Across 3 review studies, all reported moderate beneficial effects of Saccharomyces cerevisiae or its fermentate/postbiotics on growth performance in animals, including poultry, swine, and livestock. However, none of the studies reported statistical significance, and effect sizes were uniformly described as moderate. The evidence base is limited to narrative reviews with no individual study data, and no specific dose, form, or duration was consistently reported.
Caveats: Evidence base is small (only 3 studies) — conclusions should be considered preliminary. All three studies are reviews rather than primary trials, limiting the strength of causal inference. None of the studies reported statistical significance. No specific dose, form, or study duration data were extractable, making practical application guidance uncertain.
The integration of postbiotics into animal feed improves growth performance, feed conversion ratios, and disease resistance in animals
Saccharomyces cerevisiae fermentate has been reported as an alternative to antibiotics in livestock production, with studies noting improvements in feed-to-weight ratio, meat quality and overall health of livestock.
The intestinal microbiota has gained increased attention ... due to its role in promoting intestinal maturation, immune system modulation, and consequently the enhancement of the health and growth performance of the host.