1 材料与方法
1.1 低聚合态纳米氢水制备
1.2 试验设计
表1 基础饲粮组成及营养水平(风干基础)Table 1 Composition and nutrient levels of the basal diet (air-dry basis) % |
| 项目Items | 含量Content |
|---|---|
| 原料Ingredients | |
| 玉米Corn | 55.80 |
| 豆粕Soybean meal | 35.52 |
| 豆油Soybean oil | 4.57 |
| 赖氨酸Lys | 0.12 |
| DL-蛋氨酸DL-Met | 0.14 |
| 磷酸氢钙CaHPO4 | 1.49 |
| 石粉Limestone | 1.06 |
| 氯化钠NaCl | 0.30 |
| 预混料Premix1) | 1.00 |
| 合计Total | 100.00 |
| 营养水平Nutrient levels2) | |
| 代谢能ME/(MJ/kg) | 12.31 |
| 粗蛋白质CP | 21.23 |
| 赖氨酸Lys | 1.09 |
| 蛋氨酸Met | 0.59 |
| 蛋氨酸+半胱氨酸Met+Cys | 0.92 |
| 钙Ca | 0.98 |
| 总磷TP | 0.67 |
| 有效磷AP | 0.43 |
1)预混料为每千克饲粮提供 The premix provided the following per kg of the diet: VA 8 500 IU,VD3 2 500 IU,VK3 15 mg,VB1 2 mg,VB2 8 mg,VB5 12 mg,VB12 0.025 mg,VE 50 IU,生物素 biotin 0.032 5 mg,烟酸 nicotinic acid 50 mg,氯化胆碱 choline chloride 700 mg,Cu 8 mg,Zn 75 mg,Fe 80 mg,Mn 100 mg,Se 0.15 mg,I 0.35 mg。 2)代谢能和有效磷为计算值,粗蛋白质、钙、总磷、氨基酸(赖氨酸、蛋氨酸、半胱氨酸)为实测值。ME and AP were calculated values, while CP, Ca, TP and amino acids (Lys, Met and Cys) were measured values. |
1.3 饲养管理
1.4 测定指标及方法
1.4.1 饲粮营养成分
1.4.2 生长性能
1.4.3 屠宰性能
1.4.4 血清脂质和抗氧化指标
1.4.5 肠道组织形态
1.4.6 盲肠菌群组成及相对丰度
1.5 数据统计分析
2 结果与分析
2.1 低聚合态纳米氢水系统构建
图1 处理微纳米气泡粒径分布(A)和常规微纳米气泡粒径分布(B)Fig.1 Particle size distribution of processed micro nano bubbles (A) and particle size distribution of conventional micro nano bubbles (B) |
表2 低聚合态纳米氢水表面张力测试结果Table 2 Surface tension test results of activated ONHW |
| 项目 Items | 时间 Time/s | 处理前 Before treatment/(mN/m) | 处理后 After treatment/(mN/m) |
|---|---|---|---|
| 序号Serial number | |||
| 1 | 60 | 71.106±0.076 | 61.214±0.061 |
| 2 | 80 | 71.000±0.069 | 61.145±0.060 |
| 3 | 100 | 70.971±0.070 | 61.093±0.057 |
| 4 | 120 | 70.950±0.071 | 61.065±0.054 |
| 5 | 140 | 70.930±0.067 | 61.044±0.058 |
| 6 | 160 | 70.911±0.065 | 61.024±0.051 |
| 7 | 180 | 70.902±0.068 | 61.006±0.054 |
| 8 | 200 | 70.884±0.070 | 61.022±0.063 |
| 9 | 230 | 70.871±0.069 | 61.000±0.052 |
| 10 | 250 | 70.849±0.061 | 60.997±0.050 |
| 平均值±标准差 ±SD | 70.937±0.066 | 61.061±0.055 |
2.2 低聚合态纳米氢水对肉鸡生长性能的影响
表3 低聚合态纳米氢水对肉鸡生长性能的影响Table 3 Effects of ONHW on growth performance of broiler chickens |
| 项目 Items | 对照组 Control group | 试验组 Experimental group | P值 P-value |
|---|---|---|---|
| 平均日增重ADG/g | 64.13±1.79b | 68.14±0.48a | 0.020 |
| 平均日采食量ADFI/g | 95.70±3.08 | 98.35±0.43 | 0.216 |
| 料重比F/G | 1.49±0.01a | 1.44±0.01b | <0.001 |
| 末重FW/g | 2 565±72b | 2 726±19a | 0.020 |
| 成活率Survival rate/% | 96.69±0.03b | 98.08±0.18a | <0.001 |
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. |
2.3 低聚合态纳米氢水对肉鸡屠宰性能的影响
表4 低聚合态纳米氢水对肉鸡屠宰性能的影响Table 4 Effects of ONHW on slaughter performance of broiler chickens % |
| 项目 Items | 对照组 Control group | 试验组 Experimental group | P值 P-value |
|---|---|---|---|
| 屠宰率Dressed percentage | 91.70±3.44 | 91.53±3.63 | 0.850 |
| 全净膛率Eviscerated rate | 77.01±5.74b | 79.41±4.19a | 0.002 |
| 半净膛率Semi-eviscerated rate | 79.67±6.80b | 81.82±4.44a | 0.001 |
| 胸肌率Breast muscle rate | 24.78±3.36 | 24.80±2.06 | 0.972 |
| 腿肌率Leg muscle rete | 19.73±1.97 | 19.89±1.90 | 0.750 |
| 腹脂率Abdominal fat rate | 1.60±0.19 | 1.63±0.46 | 0.751 |
2.4 低聚合态纳米氢水对肉鸡血清脂质指标的影响
表5 低聚合态纳米氢水对肉鸡血清脂质指标的影响Table 5 Effects of ONHW on serum lipid indices of broiler chickens mmol/L |
| 项目 Items | 对照组 Control group | 试验组 Experimental group | P值 P-value |
|---|---|---|---|
| 总胆固醇TC | 3.37±0.69 | 3.39±0.48 | 0.946 |
| 甘油三酯TG | 4.54±1.51a | 2.68±0.75b | 0.003 |
| 高密度脂蛋白胆固醇HDL-C | 2.48±0.48 | 2.61±0.34 | 0.503 |
| 低密度脂蛋白胆固醇LDL-C | 1.77±0.44 | 1.73±0.32 | 0.778 |
2.5 低聚合态纳米氢水对肉鸡血清抗氧化指标的影响
表6 低聚合态纳米氢水对白羽肉鸡血清抗氧化指标的影响Table 6 Effects of ONHW on serum antioxidant indices of broiler chickens |
| 项目 Items | 对照组 Control group | 试验组 Experimental group | P值 P-value |
|---|---|---|---|
| 过氧化氢酶CAT/(U/mL) | 0.17±0.03 | 0.18±0.03 | 0.429 |
| 丙二醛MDA/(nmol/mL) | 1.85±0.06a | 1.49±0.15b | <0.001 |
| 谷胱甘肽过氧化物酶GSH-Px/(U/mL) | 1 924.57±168.75 | 1 833.14±194.40 | 0.366 |
| 超氧化物歧化酶SOD/(U/mL) | 18.87±1.29b | 20.78±1.21a | 0.009 |
| 总抗氧化能力T-AOC/(mmol/L) | 1.49±0.07 | 1.50±0.11 | 0.819 |
2.6 低聚合态纳米氢水对肉鸡空肠形态的影响
表7 低聚合态纳米氢水对肉鸡空肠形态的影响Table 7 Effects of ONHW on jejunum morphology of broiler chickens |
| 项目 Items | 对照组 Control group | 试验组 Experimental group | P值 P-value |
|---|---|---|---|
| 绒毛高度Villus height/μm | 1 055.78±45.12b | 1 273.57±94.68a | 0.006 |
| 隐窝深度Crypt depth/μm | 160.67±10.22 | 173.62±12.18 | 0.163 |
| 绒毛高度/隐窝深度Villus height/crypt depth | 6.58±0.40b | 7.35±0.42a | 0.039 |
2.7 低聚合态纳米氢水对肉鸡肠道菌群结构的影响
2.7.1 Alpha多样性分析
表8 肠道菌群Alpha多样性Table 8 Intestinal microbiota Alpha diversity |
| 项目 Items | 对照组 Control group | 试验组 Experimental group | P值 P-value |
|---|---|---|---|
| Ace指数Ace index | 645.02±91.71 | 658.84±30.01 | 0.835 |
| Chao1指数Chao1 index | 632.04±90.01 | 644.97±31.53 | 0.769 |
| Shannon指数Shannon index | 4.31±0.17 | 4.54±0.20 | 0.129 |
| Simpson指数Simpson index | 0.04±0.01 | 0.03±0.01 | 0.245 |
| Sobs指数Sobs index | 574±70 | 597±35 | 0.530 |
| 覆盖度指数Coverage index | 0.997±0.00 | 0.997±0.00 | 0.760 |
2.7.2 肠道菌群共有物种分析
2.7.3 肠道菌群物种组成分析
图3 门水平(A)和属水平(B)物种相对丰度Firmicutes:厚壁菌门;Bacteroidota:拟杆菌门;Actinobacteriota:放线菌门;Cyanobacteria:蓝藻菌门;Desulfobacteria:脱硫杆菌门;Proteobacteria:变形菌门;unclassified_k_norank_d_Bacteria:未分类的细菌;Bcateroides:拟杆菌属;norank_f_norank_o_Clostridia_UCG-014:未命名的梭菌属UCG-014;norank_f_norank_o_Clostridia_vadinBB60_group:未命名的梭菌属vadinBB60;Alistipes:另枝杆菌属;Lactobacillus:乳酸菌属;Faecalibacterium:粪杆菌属;Ruminococcus_torques_group:扭曲瘤胃球菌群;Bamesiella:巴氏菌属;norank_f_norank_o_RF39:未命名的细菌RF39;others:其他。 Fig.3 Relative abundance of species at phylum level (A) and genus level (B) |
2.7.4 LEfSe分析
图4 门水平(A)和属水平(B)上的LDA条形图95% confidence interval:95%置信区间;proportions:比例;Difference between proportion:比例差异;P-value:P值;Firmicutes:厚壁菌门;Bacteroidota:拟杆菌门;Bcateroides:拟杆菌属;Alistipes:另枝杆菌属;Lactobacillus:乳酸菌属;Ruminococcus_torques_group:扭曲瘤胃球菌群。 Fig.4 LDA bar chart at phylum level (A) and genus level (B) |
