Replacing Cottonseed Meal and Sorghum Grain with Corn Dried Distillers Grains with Solubles in Lamb Feedlot Diets: Growth Performance, Rumen Fluid Parameters, Blood Serum Chemistry, Carcass Characteristics, and Sensory Panel Traits
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Effects of replacing cottonseed meal (CSM) and sorghum grain with dried distillers grains with solubles (DDGS) in Dorper ram lamb (n = 46) feedlot diets on growth performance, rumen fluid parameters, and blood serum chemistry were evaluated. In a randomized design study, lambs were individually fed ad libitum 70.9% concentrate diets for 56-d in individual pens. The positive control diet (CNTL) contained CSM, sorghum grain, and other concentrates, but no DDGS. Four treatment diets were similar to CNTL, but did not contain CSM. Corn DDGS replaced 0% (0DDGS), 33% (33DDGS), 66% (66DDGS) or 100% (100DDGS) of the sorghum grain in the treatment diets. At 48-h postmortem, the longissimus thoracis was removed from the carcass, frozen, thawed, cooked, and evaluated by a trained sensory panel. Lambs fed CNTL were compared to 0DDGS and linear and quadratic effects were evaluated within the four DDGS diets. A treatment × day interaction was observed (P < 0.001) for lamb BW, but not for ADG, DMI, or G:F (P ≥ 0.78). Lambs fed CNTL had greater (P 0.02) BW on d 42 and 56 and greater (P < 0.008) overall ADG and G:F than lambs fed 0DDGS. On d 42 and 56, lamb BW quadratically increased (P 0.04) as DDGS increased in the diet. Averaged across all days, ADG quadratically increased (P < 0.001) and DMI and G:F tended to quadratically increase (P 0.08) as DDGS increased in the diet. On d 56, ruminal pH quadratically decreased (P < 0.001), ruminal ammonia N quadratically increased (P < 0.001), acetate linearly increased (P < 0.001), and acetate:propionate tended to linearly increase (P = 0.08) as DDGS increased in the diet. Various blood serum profiles were affected by diet, but data suggested that diet did not negatively affect lamb health. Lambs fed CNTL had greater (P ≤ 0.03) hot carcass weight (HCW) and ribeye area (REA) than lambs fed 0DDGS. As DDGS incrementally replaced sorghum grain, HCW and flank fat quadratically increased (P ≤ 0.05), marbling linearly decreased (P = 0.03), rib eye area tended to linearly increase (P = 0.06), and skeletal maturity tended to linearly decrease (P = 0.06). No differences in sensory panel traits were observed (P 0.06) between lambs fed CNTL or 0DDGS. As DDGS incrementally replaced sorghum grain, juiciness linearly increased (P = 0.03), cook loss quadratically increased (P = 0.05), lamb flavor identity tended to quadratically increase (P = 0.09) and certain flavor attributes quadratically increased (brown, roasted, umami; P ≤ 0.03), quadratically decreased (metallic; P = 0.004), or linearly increased (bloody; P = 0.003). Results indicated that lamb growth performance is enhanced when CSM is used to increase dietary CP (CNTL vs. 0DDGS) and that the 66DDGS diet resulted in the greatest growth performance. Results also indicated that carcass and sensory characteristics are not negatively affected (some are enhanced) when DDGS replaces CSM and sorghum grain in Dorper lamb feedlot diets.
dried distillers grains
Hodges, Kade Matthew (2019). Replacing Cottonseed Meal and Sorghum Grain with Corn Dried Distillers Grains with Solubles in Lamb Feedlot Diets: Growth Performance, Rumen Fluid Parameters, Blood Serum Chemistry, Carcass Characteristics, and Sensory Panel Traits. Master's thesis, Texas A&M University. Available electronically from