Evaluation of Saccharomyces cerevisiae fermentation product as an alternative to monensin on growth performance, cost of gain, and carcass characteristics of heavy-weight yearling beef steers1

Abstract

Two hundred fifty-two cross-bred yearling steers (406 ± 24 kg BW) were used in a completely randomized block design with a 2 × 2 factorial arrangement of treatments (7 pens/treatment) to evaluate the effects of dietary Saccharomyces cerevisiae fermentation product (SFP) and monensin (MON) on growth performance and carcass characteristics. Dietary treatments arranged as a 2 × 2 factorial were 1) with or without SFP and 2) with or without MON. Finishing diets contained 19.7% of DM as dried distiller's grains with solubles. Both SFP and MON were added in the total mixed ration in place of an equal amount of cornmeal (DM basis; target intake = 2.8 g of SFP and 33 mg of MON/kg of dietary DM). Each treatment group was offered ad libitum access to a transition ration from d 1 to 8 and then to the finishing ration from d 9 to 125. Body weights were collected on d 0, 28, 56, 84, 110, and 125. Initial and final BW was an average of 2-d weights (d -1 and 0 and d 124 and 125, respectively). Steers were shipped for harvest on d 125. Overall ADG was decreased (P = 0.03) in steers supplemented with SFP, but final BW was similar among treatments. Feeding SFP was associated with lighter (P < 0.01) HCW and a greater (P = 0.01) number of carcasses grading USDA Choice. Twelfth rib fat thickness was not affected by SFP (P = 0.82) or MON (P = 0.35), but numerical decreases in 12th rib fat thickness among cattle receiving SFP or MON alone contributed to a tendency (P = 0.07) for greater 12 rib fat thickness when SFP and MON were provided. There was no effect of treatment on cost of gain (P ≥ 0.21). The effects of SFP in the current study may have been limited in heavy yearling steers due to consumption of a finishing diet containing 19.7% dried distiller's grains with solubles.

Comparison of active dry yeast (Saccharomyces cerevisiae) and yeast culture for growth performance, carcass traits, meat quality and blood indexes in finishing bulls

“…Under the dietary conditions of our study, significantly increased HCW and NMW can be caused by improved final weight by ADY supplementation. In addition, compared with CON, both ADY and YC supplementation had no significant effect on dressing percentage, LM area and 12th rib fat thickness of finishing bulls, which was consistent with the research of YC in steers (Swyers et al ) and ADY in lambs (Kawas et al ). It is worth noting that the 12th rib fat thickness in the ADY group tended to decline compared to the YC group.…”

“…Moreover, age and weight of cattle (Swyers et al . ) and environmental temperature (trial carrying out during summer) may also limit its role in improving growth performance in the present study.…”

“…In a recent study using the same YC preparations (Diamond V XP), not only was ADG of steers not improved, but it decreased compared to the control without YC (Swyers et al . ). However, in another study both ADG and feed efficiency were all enhanced by YC supplementation (Hinman et al .…”

“…Furthermore, a similar response was observed in the study of Swyers et al . (), when YC (28 g/day, Diamond V XP) was added to the monensin diet (33 mg/kg DM), in which ADG of heavy‐weight yearling beef steers was less (1.57 vs. 1.62, P > 0.05) than when only monensin was fed. In the current study, the same heavy‐weight cattle, a similar dose of monensin (34.5 mg/kg DM) and more YC (50g/day, Diamond V XP) were used, and no significant difference for ADG was observed between the YC group and the CON group.…”

049 Physiological and molecular mechanisms associated with performance, immunometabolic status, and liver function in transition dairy cows fed rumen-protected methionine or choline

“…As such, these approaches result in physiologic profiles associated with a smoother transition into lactation , Swyers et al, 2014, Osorio et al, 2016.…”