Effects of different Lys/Met ratios on the antioxidant capacity, tissue morphology, and fatty acid composition of subcutaneous fat in Tibetan sheep on low-protein diets: a lipidomic analysis - Sa, Rengeerli; Zhang, Fengshuo; Zhang, Xianhua; Gao, Wei; Zhang, Yu; Gan, Jiacheng; Hou, Shengzhen; Gui, Linsheng (Frontiers in Veterinary Science, 2025)