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- Title
Effects of feeding soybean oil and high-corn silage diets on feedlot performance of beef cattle.
- Authors
Reynolds, C. K.; Fluharty, F. L.; Loerch, S. C.
- Abstract
The objective was to determine the effect of feeding soybean oil (SO) and high corn silage (CS) diets on feedlot performance and carcass characteristics in beef steers. Angus based-steers (n = 168; BW = 287 kg) were allotted to 24 pens (7 steers each) and assigned to one of 6 treatments (4 pens each) based on 3 forage regimens with or without SO supplementation in a 3 X 2 arrangement of treatments. Forage regimens (8 pens each) were low CS diets for the entire finishing period (LO) or high CS diets for 126 (HILO) or 210 (HI) d, followed by LO until slaughter. Within each forage regimen 4 pens were fed SO (5 % of diet DM) for the entire study. There were no implants or ionophores used. Steers were harvested when s.c. back fat depth by ultrasound (pen mean) was 1 cm. Final BW (Table) increased (P < 0.01) with greater CS and SO. Increasing CS decreased ADG (P < 0.01). Feeding SO tended to decrease ADG for HI-LO and HI, but not LO (P < 0.08). DMI was greater for LO (P < 0.01) compared to HI-LO and HI, was reduced by SO (P < 0.01), and the reduction was less for LO (P < 0.04). Gain/kg feed DM was decreased (P < 0.01) with increased CS and increased (P < 0.01) by SO. Dressing % (61.3) and marbling score (569) were not affected by treatments, but kidney, heart and pelvic fat % was reduced (P < 0.02) by SO (2.43 vs. 2.10). In conclusion, feeding high CS diets increased total carcass yield without reducing quality, but increased time on feed and decreased ADG. Feeding SO increased gain/feed ratio, but increased feed costs and reduced ADG for the high CS diets.
- Subjects
CATTLE carcasses; SOYBEAN as feed; SOY oil; BEEF cattle; SILAGE; ANIMAL feeding; BEEF carcasses; ANIMAL carcasses
- Publication
Journal of Animal Science, 2006, Vol 84, p69
- ISSN
0021-8812
- Publication type
Article