Moringa oleifera leaves (MOL) have gained great interest as a non-traditional feed ingredient due to their unique nutritional value. Therefore, the objective of the current study was to evaluate the effects of graded dietary supplementation levels with MOL on performance, carcass characteristics, antioxidant capacity, blood biochemical constituents, meat quality, and fatty acids profile of growing rabbits. A total of 120 weaned New Zealand white rabbits (6 weeks old) were randomly allotted into 4 dietary groups with 5 replicates each (n = 6), which were fed for 42 days with a basal diet as control or 3 experimental diets supplemented with 5, 10, or 15 g/kg MOL. The results showed that, compared to the control group, the dietary inclusion of MOL at a level of 10 and 15 g/kg DM linearly increased (p < 0.01) final live weight (2403.3 and 2498.2 vs. 2166.6) and average daily weight gain (36.5 and 35.51 g/d vs. 28.72 g/d), and enhanced feed conversion ratio (2.49 and 2.50 vs. 3.14). The dietary supplementation with MOL linearly increased dressing out percentage, spleen index, intestinal length, and decreased abdominal fat index (p < 0.01). Greater serum levels of total protein and globulin, but lower alanine aminotransferase and aspartate aminotransferase were observed in the MOL-fed rabbits (p < 0.01). Serum levels of total triglycerides, cholesterol, and low-density lipoprotein (p < 0.05) were decreased linearly and quadratically in the MOL groups compared with the control. Glutathione peroxidase activity increased (p < 0.01), whereas malondialdehyde decreased (p < 0.01) linearly and quadratically in both serum and meat, in response to dietary MOL supplementation. Dietary MOL supplementation increased the meat crude protein content but lowered the relative content of ether extract in the meat (p < 0.05). The relative content of the meat n-3 PUFA was increased by about 33.71%, 29.46%, and 24.36% for the MOL_0.5%, MOL_1%, and MOL_1.5% groups compared to control. In conclusion, MOL could be used at a level of 1.5g/kg of the growing rabbits’ diets with beneficial impacts on performance, antioxidant capacity, and the nutritional value of the meat.

中文翻译：

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日粮含辣木叶对成年兔子生产性能，肉特性，氧化稳定性和脂肪酸谱的影响

辣木叶（MOL）由于其独特的营养价值，已成为非传统饲料原料，引起了极大的兴趣。因此，本研究的目的是评估分级添加MOL对日粮的性能，performance体特性，抗氧化能力，血液生化成分，肉质和脂肪酸谱的影响。将总共​​120只断奶的新西兰白兔（6周龄）随机分为4个饮食组，每组5个重复（n = 6），以基础饮食作为对照组或3个实验饮食（补充5个）喂养42天，10或15 g / kg MOL。结果表明，与对照组相比，膳食中MOL含量为10和15 g / kg DM线性增加（p <0.01）的最终活重（2403.3和2498.2 vs. 2166.6）和平均日增重（36.5和35.51 g / d vs. 28.72 g / d），并提高了饲料转化率（2.49和2.50 vs. 3.14）。含MOL的膳食补充剂可以使穿衣率，脾脏指数，肠长和腹部脂肪指数线性增加（p <0.01）。在接受MOL喂养的兔子中，总蛋白和球蛋白的血清水平较高，但丙氨酸氨基转移酶和天冬氨酸氨基转移酶较低（p <0.01）。与对照组相比，MOL组的血清总甘油三酸酯，胆固醇和低密度脂蛋白水平（p <0.05）呈线性和二次下降。谷胱甘肽过氧化物酶活性的增加（p<0.01），而丙二醛在饮食中补充MOL时，在血清和肉中呈线性和二次线性下降（p <0.01）。膳食中的MOL补充增加了肉中的粗蛋白含量，但降低了肉中醚提取物的相对含量（p <0.05）。与对照组相比，MOL _0.5％， MOL _1％和MOL _1.5％组的肉n-3 PUFA的相对含量分别增加了33.71％，29.46％和24.36％。综上所述，MOL的用量可以为生长中的兔子日粮的1.5g / kg，对肉的性能，抗氧化能力和肉的营养价值产生有益的影响。