PSV-B-19 Effect of Phi-Chrome on Beef Cattle Feedlot Performance in Commercial Conditions in Mexico

Abstract An observational study was conducted to investigate the effect of Phi-Chrome (chromium propionate) on feedlot cattle performance in commercial conditions Mexico. Performance data from 116 closeouts pens involving 7,207 crossbred bulls (25% Bos taurus - 75% indicus) fed 140 d with or without were collected a located central Mexico and analyzed; DMI, ADG, FE 58 over 2019 (control, 0 ppb Phi-Chrome) contrasted 2020 (Phi-Chrome, 500 ppb). Data analyzed by linear mixed models, including fixed effects treatment (Phi-Chrome; vs. ppb), season year which started feeding (spring, summer, fall, winter), interaction × season, average initial body weight as covariate (from 324 351 kg). The fitted random effect. There no significant interactions (P ≥ 0.117). Season main ≤ 0.024) DMI not 0.472) ADG. Average 0.001) ADG FE, but = 0.533) DMI. greater for (9.40 kg•animal-1•d-1 9.67 control; P 0.001). different between treatments (1.73 kg•d-1 1.74 0.472). better (Gain:Feed: 0.185 0.180 0.013. Feed conversion ratio: 5.43 5.56 0.021). This research suggests that feed efficiency beef is improved ~2.5% Phi-Chrome.