【摘要】 为研究放牧补饲对草地藏系绵羊生长性能、瘤胃发酵参数及血清生化、免疫和抗氧化指标的影响，试验选取7月龄体重(23.74±2.16)kg、体尺相近、健康的藏系绵羊60只，随机分为2组，每组3个重复，每个重复10只。其中自然放牧组全天草场放牧，不补饲；放牧+补饲组全天草场放牧，归牧后补饲精料补充料，试验期间2组实行同等条件下放牧管理，9:00出牧，17:30归牧，试验期为70 d(预试期10 d,正试期60 d)。结果表明：放牧+补饲组的体高极显著高于自然放牧组(P<0.01),放牧+补饲组的体重、平均日增重和体长显著高于自然放牧组(P<0.05)。放牧+补饲组的瘤胃pH值和乙酸/丙酸值极显著低于自然放牧组(P<0.01),放牧+补饲组的总挥发性脂肪酸、乙酸、丁酸、异丁酸和异戊酸极显著高于自然放牧组(P<0.01),放牧+补饲组的氨态氮、丙酸、戊酸显著高于自然放牧组(P<0.05)。放牧+补饲组血清中萄萄糖的含量极显著高于自然放牧组(P<0.01),放牧+补饲组血清中免疫球蛋白G的含量显著高于自然放牧组(P<0.05)。放牧+补饲组血清中谷胱甘肽过氧化物酶和超氧化物歧化酶的含量极显著高于自然放牧组(P<0.01),放牧+补饲组血清中总抗氧化能力的含量显著高于自然放牧组(P<0.05)。而自然放牧组血清中丙二醛的含量显著高于放牧+补饲组(P<0.05)。综上，补饲精料补充料可提高放牧条件下草地藏系绵羊的生长性能、瘤胃发酵水平、血清抗氧化能力和免疫功能，能改善血清生化指标。更多还原

【Abstract】 The aim of this experiment was to determine the effects of grazing supplementation on the growth performance, rumen fermentation parameters and serum biochemical, immunological and antioxidant indices in grassland Tibetan sheep. Sixty healthy Tibetan sheep weighing(23. 74±2. 16) kg at 7 months of age, with similar body size, were selected and randomly divided into two groups, with three repli-cates in each group and 10 sheep in each replicate. Among them, the natural grazing group grazed on the pasture all day without supplementalfeeding; the grazing+supplemental feeding group grazed on the pasture all day without supplemental feeding, but supplemented with concen-trate after returning from the pasture. During the test, the two groups received the grazing management under the same conditions, grazing be-ginning at 9: 00 and returning from the pasture at 17: 30; and the test period was 70 d(pre-test period of 10 d, and the main test period of60 d). The results showed as follows: The body height of the grazing+supplementary feeding group was significantly higher than that of thenatural grazing group(P<0. 01); and the body weight, ADG and body length of the grazing+supplementary feeding group were significantlyhigher than those of the natural grazing group(P<0. 05). The pH value and acetic acid/propionic acid value of the natural grazing groupwere significantly higher than those of the grazing+supplementary feeding group(P<0. 01); the total volatile fatty acids, acetic acid, butyricacid, isobutyric acid and isovaleric acid of the grazing+supplementary feeding group were significantly higher than those of the grazing+sup-plementary feeding group(P<0. 01); and ammoniacal nitrogen, propionic acid, and valeric acid were significantly higher(P<0. 05) in thegrazing+supplementary feeding group than those in the natural grazing group. The content of GLU in the serum of the grazing+supplementaryfeeding group was highly significant(P<0. 01) higher than that of the natural grazing group, and the content of IgG in the serum of the graz-ing+supplementary feeding group was significantly higher(P<0. 05) than that of the natural grazing group. The content of GSH-Px and SODin serum of the grazing+supplemental feeding group was extremely significantly higher than those in the natural grazing group(P<0. 01), andthe content of T-AOC in serum of the grazing + supplemental feeding group was significantly higher than that in the natural grazing group(P<0. 05). The serum content of MDA was significantly higher(P<0. 05) in the natural grazing group than in the grazing+supplementalfeeding group. Taken together, supplemental feeding of concentrate contributed to the growth performance, rumen fermentation level, serumantioxidant capacity and immune function of grassland Tibetan sheep under grazing conditions, and improve their serum biochemical indexes.更多还原