1 材料与方法
1.1 试验设计和饲料
表1 试验饲料组成及营养水平(干物质基础)Table 1 Composition and nutrient levels of experimental diets (DM basis) % |
| 项目 Items | 组别Groups | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| C20 | C22 | C24 | C26 | C28 | C35 | ||||||||
| 原料Ingredients | |||||||||||||
| 鱼粉Fish meal | 25.00 | 23.75 | 22.50 | 21.25 | 20.00 | 15.00 | |||||||
| 豆粕Soybean meal | 20.00 | 22.00 | 24.00 | 26.00 | 28.00 | 35.00 | |||||||
| 花生麸Peanut bran | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | 12.00 | |||||||
| 鸡肉粉Chicken meal | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | 10.00 | |||||||
| 面粉Flour | 22.00 | 22.00 | 22.00 | 20.00 | 20.00 | 18.00 | |||||||
| 鱼油Fish oil | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | 2.00 | |||||||
| 大豆卵磷脂Soybean lecithin | 2.00 | 2.10 | 2.30 | 2.30 | 2.40 | 2.70 | |||||||
| 磷酸二氢钙Ca(H2PO4)2 | 1.50 | 1.50 | 1.50 | 1.50 | 1.50 | 1.50 | |||||||
| 维生素预混料Vitamin premix1) | 0.20 | 0.20 | 0.20 | 0.20 | 0.20 | 0.20 | |||||||
| 矿物质预混料Mineral premix1) | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | 0.50 | |||||||
| 赖氨酸Lysine | 0.05 | ||||||||||||
| 蛋氨酸Methionine | 0.20 | 0.20 | 0.20 | 0.20 | 0.30 | 0.35 | |||||||
| 氯化胆碱Choline chloride | 0.20 | 0.20 | 0.20 | 0.20 | 0.20 | 0.20 | |||||||
| 食盐NaCl | 0.30 | 0.30 | 0.30 | 0.30 | 0.30 | 0.30 | |||||||
| 海藻酸钠Sodium alginate | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | 1.20 | |||||||
| 微晶纤维素Microcrystalline cellulose | 2.90 | 2.05 | 1.10 | 2.35 | 1.40 | 1.00 | |||||||
| 合计Total | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | 100.00 | |||||||
| 营养水平Nutrient levels2) | |||||||||||||
| 粗蛋白质Crude protein | 39.30 | 39.40 | 39.50 | 39.50 | 39.60 | 39.50 | |||||||
| 粗脂肪Crude lipid | 8.40 | 8.40 | 8.50 | 8.40 | 8.40 | 8.30 | |||||||
| 粗灰分Ash | 7.70 | 7.80 | 7.70 | 7.60 | 7.80 | 7.70 | |||||||
1.2 饲养管理
1.3 样品采集与指标测定
1.3.1 生长性能
1.3.2 饲料营养成分和体成分
1.3.3 血清代谢物
1.3.4 肠道免疫应答指标
1.3.5 肠道紧密连接蛋白基因表达
表2 引物序列Table 2 Primer sequences |
| 基因Genes | 引物序列Primer sequences(5'—3') |
|---|---|
| β-肌动蛋白 β-actin | F:GAGCAACACGGAGTTCGTTGT R:CATCACCAACTGGGACGACATGGA |
| 闭锁小带蛋白-1 ZO-1 | F:ATTTGTAGCTTCCCCTCGGC R:GCGACGCATTCGTCAAAAGT |
| 闭锁小带蛋白-2 ZO-2 | F:AAGAAGAAGGACCTGCGGAA R:TGGGTTCTGTTTTGGCGATG |
| 闭合蛋白 Occludin | F:TACCATTACTGCGTGGTGGA R:TCACTCTGCGCCATAAGATG |
| 封闭蛋白-3 Claudin-3 | F:CTTTCGGATTGGAGCTCGTG R:TTACACTGCATCTGTCCGGT |
1.4 数据统计分析
2 结果
2.1 饲料中添加豆粕对凡纳滨对虾生长性能的影响
表3 饲料中添加豆粕对凡纳滨对虾生长性能的影响Table 3 Effects of dietary soybean meal on growth performance of Litopenaeus vannamei |
| 项目 Items | 组别Groups | |||||
|---|---|---|---|---|---|---|
| C20 | C22 | C24 | C26 | C28 | C35 | |
| 存活率SR/% | 83.33±3.00 | 86.67±5.07 | 93.33±4.17 | 85.83±3.00 | 89.20±4.66 | 90.83±0.83 |
| 终末体重FBW/g | 9.90±0.22a | 8.99±0.41ab | 8.42±0.40ab | 8.50±0.50ab | 8.40±0.95ab | 7.32±0.64b |
| 增重率WGR/% | 1 203.21±42.59a | 1 101.22±48.13ab | 1 011.53±45.04ab | 1 026.12±77.39ab | 1 060.19±123.16ab | 889.38±80.08b |
| 特定生长率 SGR/(%/d) | 3.95±0.05a | 3.82±0.06ab | 3.70±0.06ab | 3.72±0.10ab | 3.76±0.16ab | 3.51±0.13b |
| 摄食量FI/(g/尾) | 12.54±0.17 | 12.33±0.58 | 11.65±0.39 | 11.76±0.07 | 11.33±1.08 | 11.03±0.17 |
| 饲料系数FC | 1.37±0.04 | 1.49±0.01 | 1.52±0.08 | 1.52±0.10 | 1.48±0.22 | 1.68±0.18 |
同行数据肩标不同小写字母表示差异显著(P<0.05),相同或无字母表示差异不显著(P>0.05)。下表同。 | |
In the same row, values with different small letter superscripts mean significant difference (P<0.05), while with the same or no letter superscripts mean no significant difference (P>0.05). The same as below. |
2.2 饲料中添加豆粕对凡纳滨对虾体成分的影响
表4 饲料中添加豆粕对凡纳滨对虾体成分的影响Table 4 Effects of dietary soybean meal on body composition of Litopenaeus vannamei % |
| 项目 Items | 组别Groups | |||||
|---|---|---|---|---|---|---|
| C20 | C22 | C24 | C26 | C28 | C35 | |
| 粗蛋白质CP | 87.41±0.20 | 86.37±0.51 | 87.07±0.35 | 86.15±0.58 | 87.24±0.44 | 85.80±0.73 |
| 粗脂肪CL | 3.27±0.19 | 3.19±0.02 | 3.01±0.06 | 3.06±0.20 | 3.14±0.05 | 3.22±0.12 |
| 粗灰分Ash | 5.90±0.15a | 5.83±0.09a | 5.86±0.03a | 5.89±0.12a | 5.85±0.09a | 5.49±0.06b |
2.3 饲料中添加豆粕对凡纳滨对虾血清代谢物的影响
表5 饲料中添加豆粕对凡纳滨对虾血清代谢物的影响Table 5 Effects of dietary soybean meal on serum metabolites of Litopenaeus vannamei |
| 项目 Items | 组别Groups | |||||
|---|---|---|---|---|---|---|
| C20 | C22 | C24 | C26 | C28 | C35 | |
| 白蛋白 ALB/(g/L) | 5.90±0.46a | 6.10±0.23a | 6.17±0.44a | 6.20±0.26a | 6.10±0.21a | 4.87±0.15b |
| 球蛋白 GLB/(g/L) | 59.60±0.58a | 54.73±0.58a | 57.87±4.91a | 54.50±4.19a | 63.66±5.71a | 37.60±5.22b |
| 甘油三酯 TG/(mmol/L) | 2.04±0.25a | 1.74±0.13ab | 1.73±0.19ab | 2.01±0.23a | 2.28±0.31a | 1.06±0.20b |
| 尿素氮 UN/(mmol/L) | 1.16±0.03 | 1.12±0.02 | 1.17±0.07 | 1.31±0.11 | 1.35±0.06 | 1.21±0.11 |
| 葡萄糖 GLU/(mmol/L) | 1.00±0.10ab | 0.87±0.09ab | 1.10±0.36ab | 1.00±0.17ab | 1.53±0.18a | 0.80±0.21b |
| 总胆固醇 TC/(mmol/L) | 2.55±0.24a | 2.46±0.22a | 2.40±0.33a | 2.53±0.23a | 2.64±0.27a | 1.59±0.25b |
| 高密度脂蛋白 胆固醇 HDL-C/(mmol/L) | 0.60±0.06a | 0.61±0.01a | 0.57±0.08a | 0.54±0.04a | 0.57±0.06a | 0.37±0.05b |
| 低密度脂蛋白 胆固醇 LDL-C/(mmol/L) | 1.31±0.19ab | 1.30±0.15ab | 1.29±0.20ab | 1.37±0.15a | 1.52±0.17a | 0.81±0.15b |
| 谷丙转氨酶 ALT/(U/L) | 335.67±15.98b | 394.33±3.93b | 393.67±44.76b | 376.00±51.48b | 380.33±44.57b | 518.33±39.21a |
| 谷草转氨酶 AST/(U/L) | 290.33±19.15 | 289.33±34.71 | 297.67±26.56 | 285.33±24.57 | 334.00±5.77 | 309.67±19.43 |
2.4 饲料中添加豆粕对凡纳滨对虾肠道免疫应答指标的影响
图1 饲料中添加豆粕对凡纳滨对虾肠道免疫应答指标的影响数据柱标相同小写字母表示差异不显著(P>0.05),不同小写字母表示差异显著(P<0.05)。下图同。 Fig.1 Effects of dietary soybean meal on intestinal immune response indices of Litopenaeus vannamei Value columns with the same small letter mean no significant difference (P>0.05), while with different small letters mean significant difference (P<0.05). The same as below. |

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