51 Supplemental Lysine in Finishing Cattle Diets

Abstract Smartamine ML (Adisseo), a bioavailable (80%) source of lysine and methionine was used to evaluate effects increasing supply on performance beef cattle. Crossbred steers (n=120, initial BW 261 kg) were individually fed diet 15% modified distillers grains plus solubles (MDGS), 68% blend high moisture dried rolled corn, 12% corn silage, 5% supplement with top-dressed daily. Steers assigned 8 inclusions lysine, 0 7 g/d in 1 g increments, 15 per treatment. Data analyzed MIXED procedure SAS as generalized randomized design animal experimental unit treatment fixed effect. Orthogonal contrasts evaluated linear, quadratic, cubic responses. Contrast statements compared the control 1, 2, 3 treatments. Feeding amounts linearly decreased DMI (P = 0.04), final live ADG 0.02) no effect G:F ≥ 0.27). Numerical differences 0.26) led trend 0.06) for improved (0.188 0.176, respectively). During Optaflexx feeding period (d 163-195), 0.01) increased 0.13) or 0.12), 0.08) (0.163 0.131, Hot carcass weight tended 0.07) decrease diet, other measures including longissimus muscle area, 12th rib fat, marbling score 0.18). In finishing cattle diets MDGS, more than supplemental did not improve performance.