جستجوی مقالات مرتبط با کلیدواژه « فاکتورهای رشد » در نشریات گروه « علوم پایه »

This study aimed to investigate the effects of casein blood substitute feed on the growth, survival and reproduction of Hirudo orientalis. At first, 100 leeches with an average weight of 3 g were reproduced. The growth indices of 200 leeches (with an initial weight of 0.038 ± 0.012 g) were measured during 10 months and also reproductive characteristics of 50 leeches during the 8th to 10th months. Leeches were fed at 30-day intervals under two treatments: using fresh blood (T1) or blood substitute feed (T2). During the rearing period, the growth of blood-fed leeches (T1) was significantly (p<0.05) faster than the blood substitutes-fed group (T2). In the 10th month, the two groups exhibited an 18% weight difference with each other. Although the amount of weight, length, diameter and number of cocoons produced in T1 were higher than T2, however the differences were not statistically significant (p<0.05). Survival rate was higher in T1 during growth and reproduction. Fertility was diagnosed in almost all adults in T1 (98%) and in most leeches of T2 (91%). The number of infants in T1 was significantly (p<0.05) higher than T2. It can be concluded that casein blood substitute feed causes less growth, reproduction and survival rate compared to fresh blood (p<0.05) in H. orientalis. However, due to health and breeding problems, using fresh blood in the reproduction and breeding time intervals of the leeches on the one hand, and the proximity of the results of the two treatments on the other hand, it can be concluded that the blood substitute feed reduces production costs, facilitates feeding of leeches and producing hygienic leeches, hence.

The aim of this study was to investigate the effect of probiotics isolated from the intestine of Beluga (Huso huso) fingerlings on growth factors, activity of digestive enzymes and carcass composition of common carp (Cyprinus carpio, Linnaeus 1758) larvae. Three hundred and sixty larvae with an average weight of approximately 200 mg after one-week adaptation to the new conditions, were fed with supplemented diets with blend of Bacillus subtilis, B. licheniformis and Saccharomyces cerevisiae in concentrations of 1.5 × 106 (T1), 3 × 106 (T2) and 4.5 × 106 (T3) CFU/100 g diet, respectively for 45 days. In control group, larvae were fed with diet without any supplementation. The experiment was carried out in a completely random design. At the end of the experiment, the results revealed that the highest final weight (35 ± 0.12 mg) and specific growth rate (0.94 ± 0.66%/day) were measured in T3. The highest feed conversion efficiency (46.52 ± 19.02%), protein efficiency ratio (0.37 ± 0.41), lipid efficiency ratio (1.22 ± 1.34), retained protein (0.0018 mg/day) and net protein utilization (0.0058%) were found in T3, while the lowest feed conversion ratio (2.34 ± 0.61) was obtained in T3. All of the above factors had significantly difference with control group (p<0.05). The maximum level of carcass crude protein (72.33 ± 0.68%) and crude lipid (13.43 ± 0.32%) were measured in T3. The  dry mater, crude energy and carcass ash levels did not exhibit significant differences in all the treatments compared to the control group (p>0.05). Amylase and lipase levels in the body extracts raised in the experimental treatments in comparison with the control group. However, only the amylase level displayed significant difference in comparison with control (p<0.05). The experiment indicated that the blend of Bacillus and yeast at different concentrations displayed different effects on carcass analyses and feeding indices in this fish and the best results were obtained in T3 (4.5 × 106 CFU/100g diet).

The effects of Microcapsulation oil on growth factor and body proximate composition of the giant fresh water prawn and some physical qualitative factors of its pellet were investigated. For this purpose, 6 pellet treatments with isoproteic 33 percent were prepared. Three level of fat 6, 9 and 12 percent were considered that tow diets made at each fat level. In one of the diet (1, 3 and 5) oil was not microcapsulated and microcapsulated in other diet (2, 4 and 6). In 12 percent lipid level, weight gain and feed conversion ratio were significantly different (P< 0.05) in treatment without microcapsultion oil (5) and microcapsulated oil treatment (6). Also specific growth rate and protein efficiency ratio was significantly (P< 0.05) higher in 6 diet  than to 1 and 2 diets. In growth factor, effect of lipid level was significant but microcapsule effect and interaction were not significant. The microcapsulation in diet 12 percent lipid level cased to significant (P< 0.05) increase in fillet fat and also in effect of lipid level and microcapsule effect. In physical qualities of pellet like durability, fat leaching, density and sinking velocity were significantly (P< 0.05) influenced to microcapsulation, especially in diets with 9 and 12 percent fat level. In conclusion oil microcapsulatin in 6 percent lipid level was not significant on growth factor, fillet fat and physical qualities of pellet.

The effects of the herbal supplement (Myrtus Communis L.) are studied on growth performance, survival, safety blood and common carp. For this experiment 500 fry carp with an average weight of 2.981 ± 16.153 and in the group of treatment 1 (control) (no additives), treatment 2 (500 ppm) and treatment 3 (700 mm kg) were studied. Feeding at a rate of 3 percent biomass for 60 days. The results of this study showed that supplementation significantly increased plant growth parameters, safety, blood and serum in the two groups receiving the extract compared to the control (p<0.05). Cholesterol parameters (treatment 2 and 3, respectively, 110.76 and 137.54 (mg/di)) and triglycerides (treatment 2 and 3, respectively, 263.83 and 282.16 (mg/di)) in the treatment of the recipient extract compared to the control (cholesterol and triglycerides, respectively, 182.93 and 322.99 (mg/di)) showed a significant reduction (p<0.05). Only calcium on blood biochemical parameters were positively influenced extract (p<0.05) and chlorine, phosphorus and magnesium were not significantly affected (p>0.05).

The present study was evaluated to determine effects of levamisole on growth and resistance of rainbow trout against density stress. For this purpose 1000 pieces fish (average weight of 150±6 g) were obtained from a local fish farm of Urmia and were divided in 5 test groups (33 kg/m3 density) and were fed on diet supplemented with levamisole at 0, 100, 250, 500 and 1000 mg per kg of diet for a period of 45 days. Then the fishes of all groups were fed on commercial diet without levamisole and were exposed density stress by 2-3 folds for the following 15 days. Biometry of fishes was done every 15 days and growth factors were measured. Results show that high level of levamisole (1000 mg/kg) had the lowest effect on growth factors of fishes. The maximum survival percent of fishes were observed in 500, 250, and 100 mg/kg Levamisole at the end of research and the level 1000 mg/kg Levamisole caused increase mortality of fishes into control group in density stress significantly (P

We aimed to evaluate the effect of compost earthworm on the growth factors and survival rate of Guppy larvae in comparison with commercial Biomar food. Guppy larvae were divided into three groups with three different food rations including group 1 (control) with Biomar food, group two with dried compost earthworm diet and the third group was fed with Biomar as an equal mixture of dried compost earthworm. The larvae rearing lasted for five weeks and then, the data were analyzed statistically. The survival rate (SR) and growth factors such as specific growth rate (SGR), body weight index (BWI) and daily growth rate (GR), in the third group compared to the other groups, and the second group were better than the control group. Significant changes were observed between the groups too (P≤0. 05). Thus, the use of dried compost earthworm and Biomar food simultaneously improves the survival rate and growth factors. It is recommended for using in diet.

Stem cells are undifferentiated pluripotent cells, can produce different tissues and organs of the body. Stem cells have two features, self-renewal and differentiation. Of the most important adult stem cells are mesenchymal stem cells. These cells are capable of proliferation and differentiation with induction in the presence of variety of growth factors. Since the placenta extract contains a large amount of VEGF, therefore placenta extract was used to induce the differentiation of omentum mesenchymal stem cells.
The omentum mesenchymal stem cells were separated and cultured and cell-specific markers CD90, CD44, CD73, CD105 and CD34 markers were tested by flowcytometry on them. The extract of the placenta was prepared and after the MTT test, we selected a 20% viability percentage. After 21 days the presence of mesenchymal stem cells omentum in medium and 20 percent of placenta extract, mesenchymal cells were differentiated into progenitor endothelial cells. The expression of CD90, CD73 and CD105 markers was negative and expression of CD31, FLK1 and CD34 markers was positive. G1 phase of the cell cycle in 2st week of prolonged, compared to the control group, this result showed that the cells were exited from the proliferative phase into differentiation phase.
Omental mesenchymal cells in adjacent to the placenta extract, differentiate into endothelial progenitor cells.

Nowadays the herbal drugs products and their derivate are used as an immunostimulants, growth promoters and physiological booster in aquatic animals. In the current study, the comparative effects of Shirazi thyme and Vitamin E on growth and health status of common carp juveniles has been investigated. The total of 144 juveniles specimens were selected and divided into four groups and were treated during 45 days as following the first group (control) were fed based on standard diet for common carp. Second group juveniles were fed with diet containing 1 %/kg dry weight of diet Shirazi thyme, The third group were fed with excess amount of 100 milligram/Kg dry weight of diet from vitamin E and the last group were fed with combined level of Shirazi thyme and vitamin E as a same level with previous groups. Growth and health parameters were evaluated 15, 30 and 45 days since beginning of essay. There was not any negative effect of Shirazi thyme prescription on growth. There was a significant difference in indices including vicerosomatic index, weight gain (%), intestine somatic index, specific growth rate, feed conversion and protein efficiency ratio of Shirazi thyme group with control. Combined level of Shirazi thyme and vitamin E had not any synergistic effect on juvenile’s growth performance. Therefore these results confirm the positive effect of 1% Shirazi thyme on growth factors in the common carp and can be recommended for aquaculture.

Inroduction & Present study was carried out in collaboration with culture and propagation section of international research institute of Sturgeon fishes during fall 2014. Growth is one of the most complicated Phenomenons that food quality and quantity as well as ingredient of food are effective in it. Fish resistance level to infections should be improved using immunestimulator such as vitamins to reduce disease risks in fish. Since abnormal levels of vitamin D and Calcium (Ca) is a accidental factor in most of the diseases; so food chain, growth and immune system are a chain cycle that increasing or decreasing of one of them affect to others directly. The aim of present study was to show that there is direct connection between growth parameters and immune system in Acipenserpersicus during 8 weeks.60 fingerlings with mean weight of 18.56 g were divided in to fifteen 50 L tanks each contain 4 fish. 4 experimental diets and 1 control group were designed with three replications. Fish in treatment 1, 2, 3 & 4 feed by 6g/Kg Ca, 3000 IU D, 12 g/Kg Ca and 6g/Kg Ca + 3000 IU D respectively. Fish in control group feed by basal diet without Ca and D. fish weight and length were measured once 2 weeks and growth parameters were calculated. Blood parameters were measured at the end of experiment. Results showed that all growth parameters in treatments1 and 2 were significantly more than other groups (P 0/05).

Inroduction & This research was performed in cooperation with hatchery rainbow tout larvae,”research center of Persian drug shafagh”located in kharf village of Somesara town. Growth is one of the most complex phenomena that quantity, quality of food ingredients are effective. In order to reduce the risk of these diseases, you must increaselevel of fish resistance to infections by stimulation of immune such as vitamins.because abnormal levels of vitamin D are a random factor of many diseases,so food cycle,growth and immune system are cyclic chain that increase or decrease in above factors influenced on direct result of other factors.The Purpose of this study was the relationship between growth factors and immune system of fingerling rainbow trout during 8 weeks. This test was 120 fish with an average weight of 3 gr with 10 density in 12 tank fiberglass.This experiment did in 3 dietary treatments with 3 replicates and 1 control group did at concentration of 3000,4000,5000 international units of vitamin D3. This study showed that all growth factors at the end of experiment in the treatment were more than pther treatments and a significant difference was observed (P

Air pollution is a global problem that has negative effects on living organisms. The aim of this study was to investigate the effect of water soluble fraction of diesel exhaust particles (DEP) on some growth factors and scale of bean’s protein. Bean plants were cultivated in experimental condition and sprayed with 30 ml of different concentrations of DEP (0.1, 0.3, 0.6 g/L) and control plants were sprayed with distilled water. Growth factors such as wet and dry weights, length of legume, legume dry weight, seed germination and leaf area in DEP-treated and the control groups were compared with SPSS software and variance analysis. Pollen and seed proteins were studied with electrophoresis method. DEP treatments caused to decrease wet weights of the all DEP-treated plants (P≤0.05), but the other factors (pod length, dry pod weight, pod weight, seed germination and leaf surface) only in the treated group with a 0.6 g/L DEP was significantly reduced. Seed protein profiles were similar in the experimental and control samples, but an increase in the density of a band with molecular mass of 62 kDa was observed in the group treated with 0.6 g/L of DEP. In protein profile of pollen, a band with molecular mass of 55 kDa was disappeared and a new band with molecular mass of 80 kDa was formed. With the consideration of reported detrimental effects for DEP, it seems that the bean plants are resistant that can be related to changes in protein banding profiles and cellular mechanisms of DEP detoxification.