title: Effects of concentration and source of supplemental fat and protein on performance of newly arrived feedlot steers.
abstract: 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 x 2 x 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.
authors.affiliation: Department of Animal Sciences, Ohio Agricultural Research and Development Center and The Ohio State University, Wooster 44691, USA.
authors.forename: F L
authors.initials: FL
authors.lastname: Fluharty
authors.forename: S C
authors.initials: SC
authors.lastname: Loerch
mesh_terms: D000818:Animals; D001835:Body Weight / Q000502:physiology; D002417:Cattle / Q000254:growth & development* / Q000502:physiology*; D004032:Diet / Q000662:veterinary; D004041:Dietary Fats / Q000008:administration & dosage* / Q000494:pharmacology; D004044:Dietary Proteins / Q000008:administration & dosage* / Q000494:pharmacology; D004435:Eating / Q000502:physiology; D002149:Energy Intake / Q000502:physiology*; D005527:Food, Fortified; D008297:Male; D011897:Random Allocation; D015430:Weight Gain / Q000502:physiology
chemical_list: D004041:Dietary Fats; D004044:Dietary Proteins