Flakemore Aaron Ross, Malau-Aduli Bunmi Sherifat, Nichols Peter David, Malau-Aduli Aduli Enoch Othniel
Animal Science and Genetics, Tasmanian Institute of Agriculture, School of Land and Food, Faculty of Science, Engineering and Technology, University of Tasmania, Private Bag 54 Sandy Bay, Hobart, TAS 7001 Australia.
College of Medicine and Dentistry, Division of Tropical Health and Medicine, James Cook University, Townsville, QLD 4811 Australia.
J Anim Sci Technol. 2017 Aug 21;59:17. doi: 10.1186/s40781-017-0143-7. eCollection 2017.
Omega-3 long-chain (≥C) polyunsaturated fatty acids (ω3 LC-PUFA) confer important attributes to health-conscious meat consumers due to the significant role they play in brain development, prevention of coronary heart disease, obesity and hypertension. In this study, the ω3 LC-PUFA content of raw and cooked (LTL) muscle from genetically divergent Australian prime lambs supplemented with dietary degummed crude canola oil (DCCO) was evaluated.
Samples of LTL muscle were sourced from 24 first cross ewe and wether lambs sired by Dorset, White Suffolk and Merino rams joined to Merino dams that were assigned to supplemental regimes of degummed crude canola oil (DCCO): a control diet at 0 mL/kg DM of DCCO (DCCOC); 25 mL/kg DM of DCCO (DCCOM) and 50 mL/kg DCCO (DCCOH). Lambs were individually housed and offered 1 kg/day/head for 42 days before being slaughtered. Samples for cooked analysis were prepared to a core temperature of 70 °C using conductive dry-heat.
Within raw meats: DCCOH supplemented lambs had significantly ( < 0.05) higher concentrations of eicosapentaenoic (EPA, 20:5ω3) and EPA + docosahexaenoic (DHA, 22:6ω3) acids than those supplemented with DCCOM or DCCOC; Dorset sired lambs contained significantly ( < 0.05) more EPA and EPA + DHA than other sire breeds; diet and sire breed interactions were significant ( < 0.05) in affecting EPA and EPA + DHA concentrations. In cooked meat, ω3 LC-PUFA concentrations in DCCOM (32 mg/100 g), DCCOH (38 mg/100 g), Dorset (36 mg/100 g), White Suffolk (32 mg/100 g), ewes (32 mg/100 g) and wethers (33 mg/100 g), all exceeded the minimum content of 30 mg/100 g of edible cooked portion of EPA + DHA for Australian defined 'source' level ω3 LC-PUFA classification.
These results present that combinations of dietary degummed crude canola oil, sheep genetics and culinary preparation method can be used as effective management tools to deliver nutritionally improved ω3 LC-PUFA lamb to meat consumers.
ω-3长链（≥C）多不饱和脂肪酸（ω3 LC-PUFA）对注重健康的肉类消费者具有重要意义，因为它们在大脑发育、预防冠心病、肥胖和高血压方面发挥着重要作用。在本研究中，评估了补充脱胶粗菜籽油（DCCO）的澳大利亚不同遗传品种优质羔羊生肉和熟肉（腰大肌）中ω3 LC-PUFA的含量。
腰大肌样本取自24只杂交一代母羊和阉公羊，它们由多塞特、白萨福克和美利奴公羊与美利奴母羊杂交产生，并被分配到脱胶粗菜籽油（DCCO）补充方案中：DCCO添加量为0 mL/kg干物质的对照日粮（DCCOC）；DCCO添加量为25 mL/kg干物质（DCCOM）和50 mL/kg DCCO（DCCOH）。羔羊单独饲养，在屠宰前42天每天每只提供1 kg饲料。使用传导干热法将用于熟肉分析的样本制备至核心温度70°C。
在生肉中：补充DCCOH的羔羊中二十碳五烯酸（EPA，20:5ω3）和EPA + 二十二碳六烯酸（DHA，22:6ω3）的浓度显著（P < 0.05）高于补充DCCOM或DCCOC的羔羊；多塞特公羊所生羔羊的EPA和EPA + DHA含量显著（P < 0.05）高于其他品种公羊所生羔羊；日粮和品种公羊之间的相互作用对EPA和EPA + DHA浓度有显著（P < 0.05）影响。在熟肉中，DCCOM（32 mg/100 g）、DCCOH（38 mg/100 g）、多塞特（36 mg/100 g）、白萨福克（32 mg/100 g）、母羊（32 mg/100 g）和阉公羊（33 mg/100 g）的ω3 LC-PUFA浓度均超过了澳大利亚定义的“来源”级ω3 LC-PUFA分类中可食用熟肉部分EPA + DHA最低含量30 mg/100 g。
这些结果表明，日粮脱胶粗菜籽油、绵羊遗传特性和烹饪制备方法的组合可作为有效的管理工具，为肉类消费者提供营养改善的ω3 LC-PUFA羊肉。
