تحقيق حاضر با هدف بررسي تأثير اسانس گياه سير (Allium sativum) در چهار سطح 0 (T0)، 10/0 (T1)، 15/0 (T2) و 20/0 (T3) گرم اسانس سير بر كيلوگرم جيره غذايي بر شاخصهاي رشد و بقاء، شاخصهاي بيوشيميايي خون و آنزيمهاي گوارشي ماهي زبرا دانيو (Danio rerio) انجام گرفت. لاروها از زمان شروع تغذيه فعال به مدت 60 روز با جيرههاي غذايي آزمايشي تغذيه شدند. نتايج نشان داد كه ماهيان تغذيه شده با جيرههاي غذايي آزمايشي بطور معنيداري در شاخصهاي رشد و بقاء نسبت به گروه شاهد در شرايط بهتري قرار داشتند (05/0>p). بر طبق نتايج، كمترين ميزان گلوكز (mg/dl 08/0±35/18) و كلسترول (mg/dl 06/0±55/3) در تيمار T3 مشاهده شد و داراي اختلاف معنيداري با گروه شاهد و ساير تيمارهاي آزمايشي بود (05/0>p) در حاليكه بيشترين ميزان پروتئين كل (g/dl 09/0±51/2) در تيمارهاي T2 و T3 اندازهگيري شد كه داراي اختلاف معنيداري با گروه شاهد و تيمار T1 ميباشد (05/0>p). مقدار آنزيم پروتئاز در تمامي ماهيان تغذيه شده با تيمارهاي آزمايشي افزايش يافت (05/0>p)، اما در مورد آنزيمهاي ليپاز و آميلاز، تنها در تيمارهاي T2 و T3 به طور معنيداري تحت تأثير اسانس گياه سير قرار گرفتند (05/0>p). بالاترين مقادير آنزيمهاي آميلاز (U/mg protein 13/0±11/9)، ليپاز (U/mg protein 10/0±55/2) و پروتئاز (U/mg protein 10/0±03/4) در T3 مشاهده گرديد. بين تيمارهاي T2 و T3 به لحاظ مقدار آنزيم پروتئاز اختلاف معنيداري وجود نداشت (05/0
چكيده لاتين :
The aims of the present study were to investigate the effects of garlic at four levels including 0 (T0), 0.10 (T1), 0.15 (T2) and 0.20 (T3) gram of garlic essential oil per kilogram of diet on growth indices and survival rate, some blood biochemical parameters and digestive enzymes of zebrafish (Danio rerio). The larvae were fed from the time of their first active feeding with experimental diets for 60 days. Results showed that the growth indices and survival rates of all groups fed with experimental diets containing garlic were significantly increased as compared to the control group (p<0.05). According to the results, the lowest amounts of glucose (18.35±0.08 mg/dl) and cholesterol (3.55±0.06 mg/dl) were observed in the T3 group as compared to the other experimental groups and the control group (p<0.05) whereas, the highest amounts of total protein (2.51±0.09 g/dl) were measured in the T2 and T3 groups that were significantly different from the control and T1 groups (p<0.05). Protease enzyme levels were increased in all groups fed with experimental diets containing garlic (p<0.05), but levels of lipase and amylase enzymes were significantly influenced by garlic only in the T2 and T3 groups (p<0.05). The highest levels of amylase (9.11±0.13 U/mg protein), lipase (2.55±0.10 U/mg protein) and protease enzymes (4.03±0.10 U/mg protein) were observed in the T3 group. There was no significant differences between the levels of protease enzyme in the T2 and T3 groups (p>0.05). According to the results of the present study, dietary supplementation of garlic had positive effects on improving the general condition, growth indices and activity of digestive enzymes of zebrafish.