Three experiments were conducted to determine the effects of supplemental fat and CP concentration in diets of newly received steers. In Exp. 1, 72 steers (initial BW 201 ± 17 kg) were used in a 2 × 2 × 2 factorial experiment to determine effects of fat (Megalac, a calcium soap of palm fatty acids [CS]) concentration (0 vs 2%), CP concentration (12 vs 14%), and CP source (spray-dried blood meal [BM] vs soybean meal [SBM]) in receiving diets. Steers fed BM ate 22.8% more during wk 1 and 15.0% more during wk 2 if there was no CS in their diets compared with steers fed BM plus 2% CS (P < .05). In Exp. 2, 160 steers (initial BW 247 ± 16 kg) were used in a randomized complete block design experiment to determine effects of adding CS (0, 2, or 4%) to 14% CP diets containing BM. No differences (P > .10) in ADG or feed efficiency (FE) occurred due to CS. In Exp. 3, 186 steers (initial BW 243 ± 20 kg) were used in a randomized complete block design experiment to determine effects of supplemental fat source in receiving diets on steer performance. Diets contained either 0% added fat (control), 4% CS, or 4% animal-vegetable blend (AV). Feeding AV improved ( P < .05) ADG and FE during wk 2 and FE for the total trial. Addition of AV to high-protein (15 to 22% CP) receiving diets improved FE, and CS resulted in no improvements in performance.
All Science Journal Classification (ASJC) codes
- Food Science
- Animal Science and Zoology