Effects of Amomum villosum essential oil on growth, digestion, intestinal antioxidant capacity and serum biochemical indexes of juvenile tilapia (Oreochromis niloticus)
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摘要: 为评估春砂仁 (Amomum villosum) 精油在尼罗罗非鱼 (Oreochromis niloticus) 养殖中促消化和保护肠道等功效,采用拌喂0 (对照组)、2 g·kg−1 (低剂量组)、4 g·kg−1 (中剂量组) 和8 g·kg−1 (高剂量组) 的春砂仁精油饲养罗非鱼幼鱼 [(20.34±2.08) g] 连续8周。结果显示,随着精油添加剂量的增加,1) 各实验组终末体质量、终末体长、体质量增长率和特定生长率呈先升后降的趋势,饵料系数呈先降后升的趋势,其中低剂量组的各项生长指标均优于其他组 (P<0.05)。2) 各实验组胃蛋白酶 (Pep)、胃淀粉酶 (G-AMS)、肠淀粉酶 (I-AMS) 和肠脂肪酶 (LPS) 活性呈先升后降的趋势,低剂量组的各项消化酶活性均显著高于其他组 (P<0.05)。3) 各实验组罗非鱼幼鱼肠道中总抗氧化能力 (T-AOC)、超氧化物歧化酶 (SOD) 和过氧化氢酶 (CAT) 活性、谷胱甘肽 (GSH) 和丙二醛 (MDA) 浓度均呈先升后降的趋势,低剂量组升高显著 (P<0.05)。4) 各实验组罗非鱼幼鱼血清中总蛋白 (TP)、球蛋白 (GLOB)、总胆固醇 (TC)、甘油三酯 (TG)、高密度脂蛋白胆固醇 (HDL-CH)、低密度脂蛋白胆固醇 (LDL-CH) 浓度,碱性磷酸酶 (ALP) 和丙氨酸氨基转移酶 (ALT) 活性均呈先降后升的趋势,其中低剂量组TP、GLOB、TC、LDL-CH和HDL-CH显著低于其他组 (P<0.05)。综上,在该实验条件下拌喂2 g·kg−1春砂仁精油能够显著增强罗非鱼幼鱼的消化和肠道抗氧化能力,提高脂质代谢水平,改善血清肝功能指标,进而提高其生长性能。Abstract: To evaluate the gastrointestinal effects of Amomum villosum essential oil on promoting digestion and protecting intestine tract in breeding of Oreochromis niloticus, we fed the juveniles [(20.34±2.08) g] with basic diets of 0 (Control group), 2 (Low-dose group), 4 (Medium-dose group) and 8 g·kg−1 (High-dose group) of A. villosum essential oil for 8 weeks. The results show that with the increase of essential oil concentration: 1) The final body mass, final body length, weight gain rate and specific growth rate increased first and then decreased, but the feed conversion ratio (FCR) decreased first and then increased. The growth indexes of the low dose group were better than those of the other groups (P<0.05). 2) The activities of pepsin, gastric amylase, intestinal amylase and intestinal lipase in each group increased first and then decreased, and the activities of digestive enzymes increased significantly in the low dose group (P<0.05). 3) The activities of total antioxidant capacity (T-AOC), superoxide dismutase (SOD), catalase (CAT), concentrations of glutathione (GSH) and malondialdehyde (MDA) in the intestine increased first and then decreased, and the difference in the low-dose group was significant (P<0.05). 4) In serum, the concentrations of total protein (TP), globulin (GLOB), total cholesterol (TC), triacylglycerol (TG), low density lipoprotein cholesterol (LDL-CH) and high-density lipoprotein cholesterol (HDL-CH), as well as activities of alanine aminotransferase (ALP) and alanine aminotransferase (ALT) decreased first and then increased. The concentrations of TP, GLOB, TC, LDL-CH and HDL-CH in the low-dose group decreased significantly (P<0.05). To sum up, adding 2 g·kg−1 A. villosum essential oil into the basic diet can improve the digestive capacity, intestinal antioxidant capacity and serum biochemical indexes of juvenile tilapia and promote their growth performance.
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Key words:
- Tilapia /
- Essential oil of Amomum villosum /
- Growth performance /
- Intestinal health /
- Antioxidant
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表 1 春砂仁精油化学成分
Table 1. Main chemical composition in essential oil of A. villosum
序号
No.成分
Compound相对含量
Relative content/%1 β-蒎烯 β-Pinene 44.670 2 α-蒎烯 α-Pinene 29.160 3 桧烯 Sabinene 14.430 4 柠檬烯 Cinene 1.974 5 4-松油醇 4-Terpineol 1.179 6 对-伞花烃 4-Cymene 1.012 7 β-月桂烯 β-Myrcene 1.010 8 β-水芹烯 β-Phellandrene 0.677 9 γ-松油烯 γ-Terpinene 0.606 10 桉叶油醇 Cineol 0.330 11 桃金娘醛 Myrtenal 0.327 12 二氢依杜兰 Edulan 0.250 13 莰烯 Camphene 0.214 14 松莰酮 Pinocamphone 0.214 15 石竹烯 Caryophyllene 0.214 16 异香芹酮 Isocarvone 0.195 17 α-松油烯 α-Terpinene 0.191 18 α-异松油烯 Isoterpinolene 0.189 19 松香芹酮 Pmocatvcme 0.175 20 桃金娘烯醇 Myrtenol 0.156 21 β-罗勒烯 β-Ocimene 0.130 22 α-葑烯 α-Fenchene 0.081 23 β-榄香烯 β-Elemene 0.079 24 α-葎草烯 α-Caryophyllene 0.077 25 对伞花炔-8-醇 Para-cymene-8-ol 0.041 总含量 Total content/% 97.581 表 2 春砂仁精油对罗非鱼幼鱼生长的影响
Table 2. Effect of A. villosum essential oil on growth performance of tilapia
项目
Item对照组
Control group/
(0 g·kg−1)低剂量组
Low-dose group/
(2 g·kg−1)中剂量组
Medium-dose group/
(4 g·kg−1)高剂量组
High-dose group/
(8 g·kg−1)初始体质量 Initial body mass/g 20.18±1.83 20.31±2.11 20.39±2.09 20.49±2.39 终末体质量 Final body mass/g 186.7±6.50a 208.20±10.50b 194.60±7.40ab 190.00±2.50a 终末体长 Final body length/cm 17.20±0.10a 17.90±0.20b 17.50±0.30 ab 17.50±0.40ab 体质量增长率 SGR/% 833.70±32.70a 941.20±52.30b 873.00±37.20ab 849.80±12.50a 摄食率 FR/(%·d−1) 4.12±0.15 3.91±0.13 4.01±0.31 4.05±0.08 特定生长率 SGR/% 3.12±0.10a 3.31±0.08 b 3.20±0.05ab 3.12±0.02a 肥满度 CF/% 3.61±0.08 3.64±0.11 3.66±0.08 3.67±0.16 饵料系数 FCR 1.41±0.05b 1.25±0.04a 1.32±0.22ab 1.40±0.07b 注:表中数据为4个重复的平均值;同行不同上标字母表示差异显著 (P<0.05)。后表同此。 Note: Data are means of four replicates for each group. Different letters within the same line indicate significant differences (P<0.05). The same case in the following tables. 表 3 春砂仁精油对罗非鱼幼鱼血清肝功能指标影响
Table 3. Effects of A. villosum essential oil on liver function index in serum of juvenile tilapia
项目
Item对照组
Control group/
(0 g·kg−1)低剂量组
Low-dose group/
(2 g·kg−1)中剂量组
Medium-dose group/
(4 g·kg−1)高剂量组
High-dose group/
(8 g·kg−1)总蛋白 TP/(g·L−1) 36.93±2.12a 29.98±3.03b 33.63±2.47ab 35.58±4.48a 球蛋白 GLOB/(g·L−1) 28.23±0.97a 22.68±1.73b 25.00±1.09ab 27.13±3.62a 碱性磷酸酶 ALP/(U·L−1) 25.00±7.53 18.67±9.87 24.67±4.93 23.50±5.32 丙氨酸氨基转移酶 ALT/(U·L−1) 17.33±5.51 13.33±3.21 15.00±0.00 16.00±1.73 天门冬氨酸氨基转移酶 AST/(U·L−1) 40.33±10.60 46.33±21.20 31.33±8.96 47.33±4.51 表 4 春砂仁精油对罗非鱼幼鱼血清脂质代谢指标影响
Table 4. Effects of A. villosum essential oil on lipid metabolism index in serum of juvenile tilapia
项目
Item对照组
Control group/
(0 g·kg−1)低剂量组
Low-dose group/
(2 g·kg−1)中剂量组
Medium-dose group/
(4 g·kg−1)高剂量组
High-dose group/
(8 g·kg−1)甘油三酯 TG/(mmol·L−1) 0.87±0.21 0.67±0.24 0.81±0.22 0.66±0.10 总固醇 TC/(mmol·L−1) 4.16±0.69a 3.08±0.50b 4.60±0.15a 4.67±0.75a 高密度脂蛋白胆固醇 HDL-CH/(mmol·L−1) 1.83±0.13b 1.58±0.20b 1.98±0.23ab 2.06±0.45a 低密度脂蛋白胆固醇 LDL-CH/(mmol·L−1) 1.93±0.52a 1.19±0.34b 2.26±0.21a 2.13±0.12a -
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