Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada; University of Saskatchewan, Saskatoon, SK S7N 5E2, Canada.
Lethbridge Research Centre, Agriculture and Agri-Food Canada, Lethbridge, AB T1J 4B1, Canada.
Meat Sci. 2014 May;97(1):76-82. doi: 10.1016/j.meatsci.2014.01.008. Epub 2014 Jan 24.
This study compared carcass, meat quality and fatty acid profiles of longissimus thoracis (LT) from feedlot cattle fed barley grain with or without oilseed (OS). Six diets containing no oilseed (No-OS), 10% ground flaxseed (FS), 10% high oleate sunflower seeds (SS) with or without 30% triticale dried distiller's grain (DDGS) were prepared. Feeding DDGS increased chroma at 24 and 144 h post mortem. Feeding FS increased weight% of LT PUFA (P<0.05) compared to No-OS or SS. An OS by DDGS interaction occurred for 18:3n-3 (P<0.05) where FS increased weight% of 18:3n-3 (P<0.05), a response accentuated (P<0.05) by DDGS. Feeding DDGS increased weight% of LT 18:2n-6 (P<0.05), but neither OS nor DDGS affected conjugated linoleic acid (CLA, t7,c9 &c9,t11-18:2). Feeding FS increased weight% of n-3 FA, and both FS and SS increased t10-18:1 with no effect on CLA or t11-18:1. Combination feeding of DDGS and FS further increased weight% of n-3 FA and tempered increases in t10-18:1 with no effect on CLA or t11-18:1. The findings suggest a new strategy to increase beef omega-3 fatty acids efficiently through inclusion of a combination of DDGS and FS in feedlot diet.
本研究比较了饲喂大麦谷物或含油籽（OS）和不含油籽（No-OS）的育肥牛背最长肌（LT）的胴体、肉质和脂肪酸谱。配制了 6 种不含油籽的日粮（No-OS）、10%粉碎亚麻籽（FS）、10%高油酸葵花籽（SS），或添加或不添加 30%黑麦干酒糟（DDGS）。饲喂 DDGS 增加了宰后 24 和 144 小时的色度。与 No-OS 或 SS 相比，FS 增加了 LT 多不饱和脂肪酸（PUFA）的重量%（P<0.05）。OS 和 DDGS 对 18:3n-3 的互作（P<0.05），FS 增加了 18:3n-3 的重量%（P<0.05），DDGS 加剧了这种反应（P<0.05）。饲喂 DDGS 增加了 LT 18:2n-6 的重量%（P<0.05），但 OS 或 DDGS 都没有影响共轭亚油酸（CLA，t7,c9 和 c9,t11-18:2）。FS 增加了 n-3 FA 的重量%，FS 和 SS 都增加了 t10-18:1，而对 CLA 或 t11-18:1 没有影响。DDGS 和 FS 的组合饲喂进一步增加了 n-3 FA 的重量%，并缓和了 t10-18:1 的增加，而对 CLA 或 t11-18:1 没有影响。研究结果表明，通过在育肥日粮中添加 DDGS 和 FS 的组合，可以有效地提高牛肉的 omega-3 脂肪酸含量。
