Meta-analysis examining the effects of Saccharomyces cerevisiae fermentation products on feedlot performance and carcass traits1,2,3

Results from 18 experiments were compiled for a meta-analysis evaluating the effects of Saccharomyces cerevisiae fermentation products (SCFP) manufactured by Diamond V on feedlot performance and carcass traits. Data were analyzed using mixed model procedures. Fixed class variables included sex (steers, heifers, bulls, or mixed) and the use of SCFP, ionophores, tylosin, and implants (each coded as no = 0, yes = 1). Days on feed and initial BW were included in models as fixed continuous variables when significant (P ≤ 0.05). Experiment was included in all models as a random class variable. The analysis was weighted by the inverse of the standard error squared for each treatment mean. Cattle fed SCFP had significant (P < 0.01) increases in final BW (2.9 ± 0.78 kg), ADG (6.5%), DMI (1%), and G:F (2.6%) versus controls (CON). Nine experiments were suitable for an analysis of receiving period data. Receiving period ADG and G:F were improved (P < 0.05) for cattle fed SCFP as compared with CON. An analysis of finishing period data (8 experiments) indicated that final BW (3.7 ± 1.48 kg), ADG (6.4%), and G:F (2.8%) were improved (P < 0.05) for cattle fed SCFP as compared with CON. The effects of SCFP and days on feed × SCFP interaction on DMI were significant (P < 0.05), suggesting that the effect of SCFP on DMI depended upon days on feed. The percentage of carcasses grading ≥low Choice was greater (P < 0.05) for SCFP versus CON (73.4 vs. 63.7%). The results of this meta-analysis support the use of SCFP in feedlot diets.