جستجوی مقالات مرتبط با کلیدواژه "ظرفیت آنتی اکسیدانی" در نشریات گروه "دامپزشکی"

This experiment was conducted for 10 weeks (40 to 52 weeks old) to investigate the effect of different sources and levels of zinc on the immune and antioxidant performance of laying hens. For this purpose, 240 high-line laying hens (36-W) were used in a completely randomized design, with 8 treatments and 5 replications (6 birds per replication). The experimental treatments include 1- control (without zinc supplement), treatment 2, 3, and 4, respectively, including the control diet + 80, 120, and 160 mg/kg of zinc sulfate with a purity of 34%, and treatment 5, 6 and 7, respectively The control diet included 50, 75 and 100 mg/kg zinc hydroxy chloride with 55% purity, and treatment 8 included the control diet + 124 mg/kg zinc-methionine complex. The findings showed that, in general, different levels of zinc supplementation in organic and hydroxy form caused significant improvement in feed conversion ratio, shell weight, Haugh unit, and blood glucose reduction compared to other treatments. During the test, organic and hydroxy sources increased antibodies against the influenza vaccine (P<0.05). Also, treatments containing zinc supplements increased superoxide dismutase and total antioxidant capacity (P<0.05). This increase was associated with a decrease in serum malondialdehyde (P<0.05). Different levels and sources of zinc had no significant effect on shape index, yolk color, and glutathione peroxidase level (P<0.05). The results show that adding hydroxy chloride at 100 mg/kg can improve the antioxidant and safety indicators of eggs.

In this study, the effects of different levels of barley malt extract (BME) in the diet of ostrich chicks (one to 120 days old) on growth performance, some blood and serum parameters and bacterial population of feces were investigated. A total number of 48 day-old ostrich chicks were randomly assigned to four treatments including different levels of barley malt extract (0, 5, 10, and 15 g/kg of basal diet) in a 120-day trial. The results showed that the use of malt extract increased weight gain and improved feed conversion ratio in the final period (P <0.05). Also, the number of heterophils and the ratio of heterophils to lymphocytes were decreased in the treatments containing BME. The levels of triglycerides, cholesterol, LDL, HDL and VLDL were significantly (P <0.05) increased. The concentration of malondialdehyde was significantly decreased whereas the total antioxidant capacity showed a significant increase (P <0.05). The number of coliforms and Escherichia coli bacterial population was significantly reduced in the treatments containing BME compared to the control treatment (P <0.05). It can be concluded that the use of BME in the diet of ostrich chicks improved immune function, antioxidant capacity and reduced the population of harmful bacteria. In general, the results of this study showed that the use of 10 g of BME per kg of diet shows the best performance in ostrich.

Nowadays, the tendency towards the extraction of phytochemicals by ultrasound method has been increased. In this research, the effect of ultrasound waves pretreatment on extraction of beta-carotene from carrot residue was studied. Carrot residues were treated with ultrasound waves with 205 W power, constant 35 KHz frequency during six stages of 0 (without ultrasound), 16, 20, 30, 40 and 44 min and at temperatures of 66, 70, 80, 90 and 94 ºC and using ethyl acetate as solvents. Then, the extract from each sample was evaluated considering the amount of total phenolic components as well as beta-carotene and antioxidant capacity of beta-carotene. According to the results, it was observed that, there was a significant difference (P<0.01) between samples in the case of beta-carotene amount with increasing of temperature and time. In order to achieve the highest extraction of carotene from carrot residues, the temperature of 90 ˚C and 40 minutes was determined as the best temperature and time. The results also revealed that at low temperatures the antioxidant capacity was higher. With increasing time of ultrasonic at low temperatures, the antioxidant capacity was enhanced. Moreover, the temperature of 70 ˚C and 40 min was determined as the optimum condition to achieve the highest antioxidant capacity of carrot residues. The result showed that the total phenolic compounds are greater at low temperature compared with high temperature. Besides, at all selected temperatures, with the increasing of ultrasonic duration the amount of total phenolics increased. Most phenols obtained at 66˚C for 40 min of ultrasonic treatment.

In the last years, there has been growing interest in finding plants for treatment and prevention of disease. Borage officinalis, Camellia sinensis, Chamaemelum nobile, Morus alba and Rosmarinus officinals are usually used in traditional medicine. The aim of this experimental study was co assay of antioxidant and flavonoids levels of alcoholic extraction of these plants. In this study the antioxidant activity was surveyed by applying iron ion reducing assay (FRAP assay) and flavonoids levels with measuring the complex flavonoids with trivalent aluminum ion. Results from the present study show,the alcoholic extraction of Rosmarinus officinals have a marked antioxidant activity, and the high levels of flavonoids was recorded by Chamaemelum nobile. Camellia sinensis had both effects; antioxidant activity, flavonoids levels. The using of screening tests such as the mentioned methods are useful for finding biological components with different effects

Due to the adverse side effects of synthetic antioxidants, the search for natural and safe antioxidants has become crucial. In this study, the total phenolic compound contents and antioxidants activity of persimmon skin was investigated. The extraction was carried out by means of maceration method using ethanol and methanol solvents with ratio of 1 part persimmon skin to 5 parts of solvents. Afterwards, the total phenolic compounds and antioxidants activity was measured. According to the results, ethanolic and methanolic extracts contained 255.6 and 214.15 mg gallic acid per 100 g of persimmon skin, respectively. Moreover, ethanolic extracts showed a higher activity for scavenging free radicals compared to methanolic extracts.