جستجوی مقالات مرتبط با کلیدواژه « immune » در نشریات گروه « دامپزشکی »

The present study was carried out in order to investigate the effect of different levels of herbal additives of milk thistle and nettle on performance indices, immune parameters and egg yolk cholesterol. A total of 90 laying hens were randomly assigned to 5 treatment groups, 6 replicates of 3 birds each in a completely randomized design. Dietary treatments included control group and different amounts of milk thistle (0.5 and 1.5%) and nettle (0.5 and 1.5%). Results showed that adding of milk thistle (1.5%) to laying hens ration improved egg mass and feed conversion ratio (P<0.05). Using of milk thistle and nettle had not effect on shell quality. The highest yolk index was found out in the eggs from hens that were fed 1.5% of milk thistle in contrast to hens fed the control treatment without milk thistle (P<0.05). Egg yolk cholesterol amount was not affected by different levels of milk thistle and nettle powder. There were no significant differences in concentrations of glucose, triglyceride, cholesterol and HDL in plasma. Using of milk thistle (1.5%) fortified immune indices by decrease of heterophile percentage and heterophile to lymphocyte ratio (P<0.05). Therefore, it can be concluded that the supplementation of laying hens diet with milk thistle (1.5%) has positive effects on performance and immune system.

Today uses of microbial compounds as probiotic are preferred for growth and immune enhancement of fish.The aim of this study was to evaluate effect of different bacterial concentration of Bifidobacterium lactis and Bifidobacterium animalis on growth performance and resistance of rainbow trout against environmental stresses. For this purpose 470 rainbow trout larvae with average mean weight of 0.538±0.197 g (±SD) were obtained and transferred to the laboratory. After 14 days adaptation to the laboratory conditions the fish were randomly divided into four treatments with three replicates (Three experimental treatment and the control). The fish were fed with three concentration of 1×109, 2×109 and 3×109 CFU/100g of probiotic in-feed and the control was fed with diet without probiotic supplementation for 60 days. Length and weight of fish were measured at the beginning and end of study. Also, at the end of study the fish were challenged with environmental stress.The Results showed that the use of the lowest concentration of bacterial increased growth and reduced cortisol in rainbow trout fish blood. Despite of significant growth rate, no significant difference were observed in environmental stresses (P>0.05). Dietary administration of the lowest probiotic concentration could increase the growth and reduced cortisol and ALAT in fish blood.

The preferential method to enjoy the benefits of Immune- complex vaccines is the in-ovo injection which needs very complex and advanced injection machines. These machines are not yet widely available. In this study، the function of an Immune- complex vaccine was compared by using two methods. The fist method was the In-ovo injection in the 18th day of incubation period and the second one was the Sub-cutanous vaccination in the day-old chicks. For this purpose four parameters including mean final weight، antibody response، bursa to body weight ratio and the grade of microscopic injuries within the bursa of fabrisius were measured. The results showed that the method of vaccination in induction of ELISA antibody response in (KPL) except for the 18th and 25th days of age did not cause any significant difference between the two vaccinated groups. In the samples for the vaccinated 32 day old chickens، bursa to body weight ratio was significantly (p<0. 05) lower than control group، but there was no significant difference between the two vaccinated groups. The histopathological study of the bursa samples indicated a significant difference (P 0/05) in microscopic injuries grade between the vaccinated groups and the control group، but this difference between the vaccinated groups except for the 8 days old chick’s samples did not show any significant difference. The amount of final weight in the end of the study between the two vaccinated groups and also between the vaccinated groups and the control group showed a significant difference (P 0/05). It can be concluded that the vaccination with the subcutaneous method in day-old chicks using the function of Immune-complex vaccine can be considered as reliable in-ovo method for the administration of immune-complex vaccines.

Use of synbiotic and zinc sources had synergetic effects on broiler chickens performance and immune response improvements. This experiment was carried out to evaluate the effect of synbiotic and zinc sources on broiler chickens performance, immune response and gut morphology. A total of 780, one-day old male broiler chicks were randomly assigned in factorial methods to 13 different experimental diets with 15 birds per replicate and 4 replicates per experimental diets for 7 weeks. The experimental diets contain unsupplemented basal diet and basal diets supplemented with varying concentrations of symbiotic (1-1.5g /kg of diets) and zinc oxide/Bioplex Zn (50-150mg/kg of the diets). In the unsupplemented basal diet weight gain was lower, feed intake and feed conversion ratio were greater than others (p<0.05). Antibody titer only in birds, fed on diets supplemented with synbiotic and zinc oxide (1.5 g of synbiotic/kg of the diets and Bioplex Zn 150 mg/kg of the diets) increased significantly (p<0.05). In duodenum the highest vili length was obtained in diet supplemented by 1.5 g synbiotic plus 150 mg /kg of diet and crypt depth in diets containing 1.5 g synbiotic/kg and 50-150 mg Bioplex Zn/ kg of diet significantly was lower than others (p<0.05).Villus in jejunum were affected of interaction effect of synbiotic and diet zinc level as in diet supplanted by 1.5 g synbiotic plus 150 mg Bioplex Zn /kg of diet were more than others and crypt depth only in diets supplemented whit 1.5 g synbiotic plus 50-150 mg Bioplex Zn was lower than basal diet (p<0.05). Highest amount of villi high/crypt depth ratio was observed in diets supplemented by 1.5g synbiotic plus 100-150 mg zinc oxide and 50-150 mg Bioplex Zn/ kg of diet(p<0.05). The best production efficiency factor was observed in diet containing 1g synbiotic plus 100 mg zinc oxide. Also supplementation of diet by 1.5 g synbiotic and 150 mg zinc oxide and Bioplex Zn had positive effects on immune response and gut morphological structure in broiler chickens.