Juárez M, Horcada A, Alcalde M J, Valera M, Mullen A M, Molina A
Department of Agroforestry Science, Agricultural Engineering College, University of Seville, 41013 Seville, Spain.
Meat Sci. 2008 Jun;79(2):203-10. doi: 10.1016/j.meatsci.2007.08.014. Epub 2007 Sep 5.
Fatty acid composition of intramuscular, intermuscular, subcutaneous, omental and kidney knob fat depots of eighty male light lambs (±21kg live weight) from five Spanish sheep breeds was analysed. Fat depot, anatomical depot location (internal, external and intramuscular), breed (Spanish Merino, Grazalema Merino, Churra Lebrijana, Segureña and Montesina), weaning type (weaning at 45 days after birth or no weaning) and subcutaneous fat thickness factors were analyzed using a statistical model to quantify their contribution to the variation of each fatty acid. Production system was the main factor to explain variations in overall fatty acid profiles (34.68%). However, for several fatty acids and indices (arachidonic, linoleic, PUFA, n-3/n-6) anatomical depot location was the most significant factor. Feeding system explained 65.49% of CLA variance, indicating a strong influence of suckling period length on CLA deposition in lambs' fat. Moreover, due to the lack of interaction between anatomical depot location or depot and breed type or weaning system for total CLA, for future research only one depot would be enough to study the effect of those factors on CLA levels.
分析了来自五个西班牙绵羊品种的80只雄性轻羔羊（活重±21千克）的肌肉内、肌间、皮下、网膜和肾周脂肪库的脂肪酸组成。使用统计模型分析脂肪库、解剖学脂肪库位置（内部、外部和肌肉内）、品种（西班牙美利奴羊、格拉查莱马美利奴羊、楚拉莱布里亚纳羊、塞格雷尼亚羊和蒙特西纳羊）、断奶类型（出生后45天断奶或未断奶）和皮下脂肪厚度因素，以量化它们对每种脂肪酸变化的贡献。生产系统是解释总体脂肪酸谱变化的主要因素（34.68%）。然而，对于几种脂肪酸和指标（花生四烯酸、亚油酸、多不饱和脂肪酸、n-3/n-6），解剖学脂肪库位置是最重要的因素。饲养系统解释了共轭亚油酸（CLA）变化的65.49%，表明哺乳期长度对羔羊脂肪中CLA沉积有很大影响。此外，由于解剖学脂肪库位置或脂肪库与品种类型或断奶系统之间对于总CLA缺乏相互作用，因此对于未来的研究，仅一个脂肪库就足以研究这些因素对CLA水平的影响。
