Effect of processing flax in beef feedlot diets on performance, carcass characteristics, and trained sensory panel ratings

摘要: To assess the effects of flax addition and processing on feedlot performance carcass characteristics, 128 yearling beef heifers (360 +/- 14 kg initial BW) were blocked by weight assigned randomly to diets that included no (control), whole (WHL), rolled (RLD; 1,300 microm), or ground (GRD; 700 microm). Heifers fed a growth diet (31% corn, 30% corn silage, 18% barley malt pellets, 14% alfalfa, 4% linseed meal, 3% supplement; DM basis) for 56 d, after which they adapted finishing (79% 7% 4.75% 2.25% basis). In WHL, RLD, GRD, replaced all meal partially at 8% DM. All provided 0.5 mg melengestrol acetate, 2,000 IU vitamin E, 232 monensin per heifer daily. Cattle slaughtered block 96, 97, 124 (2 blocks) d feed. At 24 h postmortem, data collected, portion loin was removed, vacuum-packaged, aged d. After aging, 2 steaks removed from each Warner-Bratzler shear force measurement, sensory panel evaluation, fatty acid analysis (approximately 100 g muscle collected). Flax inclusion (WHL, GRD vs. control) did not affect DMI (P = 0.79), fat thickness over 12th rib 0.32), LM area 0.23). increased ADG 0.006), G:F USDA yield grade 0.01). (RLD WHL) 0.05), 0.08), apparent dietary NEm NEg 0.003). Muscle had greater phospholipid 18:3n-3 < 0.001), 20:5n-3 22:5n-3 22:6n-3 0.02) fractions, neutral lipid 0.001). Feeding gain efficiency, available energy resulted in efficiency gain. also levels n-3 acids fresh beef.