LAUSR

The objective was to determine effects on performance from using Narasin (Skycis, Elanco) or a phytonutrient blend (Lean Fuel, Furst-McNess Company), or used in combination. 856 pigs (40.7±3.1 kg BW) were used in the experiment and pens were blocked by nursery feeding program within block to 1 of 4 treatments in a 2x2 factorial arrangement with 8 pens per treatment: 1) Basal Diet met NRC2012 requirements (C), 2) Basal diet + 13.6 g/ton of Narasin throughout the study (Nar), 3) Basal diet + 1.25 kg of Lean Fuel from day 50 of the study to market (LF) and 4) Basal diet + 13.6 g/ ton Narasin throughout the study + 1.25 kg of Lean Fuel from day 50 of the study to market (LF+Nar). Carcass data were collected by 3 market cuts (d 78, 92 and 106 of study) shipping 1/3 of pigs from every pen on each cut. Data were analyzed using the MIXED procedure of SAS (SAS Institute, Inc., Cray, NC) from Day 0 to 50, and as a 2x2 factorial arrangement from Day 50 to market and initial BW was used as covariate. No statistical differences in performance from Day 0 to 50. No difference in mortality: 1.34%, 1.32%, 1.36% and 0% of C, Nar, LF and Nar+LF, respectively. From Day 50 to market, main effect of Narasin improved ADG (1043 g/d vs 1025 g/d, P=0.02), and there was a trend for an interaction with LF (P=0.076), where LF+Nar had the greatest ADG 1055 g/d. Numerical increase in carcass weight for LF (94.92 vs 94.29 kg, P=0.19). Nar and Nar+LF had greater carcass weight for Cut 1 (P=0.072) and Cut 2 (P=0.01) as compared to the other treatments with no difference for Cut 3 and the results are given in Table 1. The results of this trial show improved performance from feeding Nar, and interactive effects on ADG and additive effects on carcass weight when using Nar and LF in combination.