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41.
Saeed Kazemi-Najafi Ali Shalbafan Ghanbar Ebrahimi 《European Journal of Forest Research》2009,128(4):345-350
Ultrasonic wave timing inspection was used to detect the internal decay in standing Iranian beech trees (Fagus orientalis). To evaluate the influence of internal decay on ultrasonic velocity, healthy round sections of freshly cut fallen beech
trees were selected. Holes [as heart or internal decay indicator and with different shapes (circular and slot) and locations]
were manually created and progressively enlarged in the wood section disks, and ultrasonic wave velocity was measured by using
a commercial ultrasonic tester (Sylvatest Duo). The results showed that ultrasonic wave velocity linearly and significantly
decreased by increasing hole dimensions, and location of holes had no influence on the extent and trend of velocity decrease.
Although slots covered a small volume fraction of disks, they had a greater effect on ultrasonic velocities reduction as compared
with circular holes. 相似文献
42.
Atefeh Sheikhlar Yong Meng Goh Razak Alimon Mahdi Ebrahimi 《Aquaculture Research》2017,48(8):4409-4419
This study was carried out to evaluate the antioxidative potential and quality of the meat of African catfish fed mulberry foliage extract (MFE). A total of 360 juvenile African catfish (8.4 ± 0.2 g) were fed four diets namely, basal diet (control), MFE‐2 (2 g MFE kg?1), MFE‐5 (5 g MFE kg?1) and MFE‐7 (7 g MFE kg?1) for 60 days. At the end of the experiment, muscles were excised, vacuum‐packaged and conditioned for 0, 7 and 14 days in a chiller (4°C). The meat from fish fed MFE‐5 and MFE‐7 had significantly (P < 0.05) greater total phenols content than the other dietary groups. This value reduced (P < 0.05) during storage. The DPPH‐scavenging effect of MFE‐7 increased (P < 0.05) compared with the others. It decreased (P < 0.05) during storage. The lowest POV was revealed (P < 0.05) in MFE‐7. The 2‐thiobarbituric acid‐reactive substances (TBARS) and peroxide value (POV) increased (P < 0.05) during storage. The pH value was significantly (P < 0.05) higher in MFE supplemented diets than in the control group. It is concluded that MFE at the concentration of 7 g kg?1 DM is potential dietary antioxidant supplements, to improve the quality of fish meat. 相似文献
43.
H. Ouraji A. M. Abedian Kenari B. Shabanpour A. Shabani M. Sodagar S. A. Jafarpour G. H. Ebrahimi 《Aquaculture International》2011,19(5):903-916
The objective of this experiment was to determine the effects of two levels of vitamin E (100 and 300 mg/kg diet) along with
two levels of lipid (9 and 14%) and their interaction on growth performance of Indian white shrimp and consequently to evaluate
the fatty acid composition and lipid stability of its muscle tissue during frozen storage. Growth of juvenile Indian white
shrimp was not significantly affected by dietary vitamin E and lipid levels. Muscle lipid content of shrimp fed diets with
14% lipid was significantly higher than that of with 9% lipid. Obvious effects of the increase in dietary lipid level on muscle
fatty acid composition were significant decrease in proportion of 16:0 and increase in proportion of 20:5n-3. The content
of vitamin E concentration in shrimp muscle reflected dietary vitamin E concentration and ranged from 6.68 to 14.8 mg/kg muscle
corresponding to two (100 and 300 mg/kg) levels of vitamin E in fish diet, respectively. Subsequently, results showed that
by increasing the concentration of vitamin E from 100 to 300 mg/kg in diet, the rate of lipid oxidation in the muscle tissue
during frozen storage was reduced and, as a result, caused higher HUFA retention in muscle of shrimp fed diet with high lipid
level. 相似文献
44.
Kamran Afsahi Marziyeh Nazari Heshmat Omidi Farid Shekari Abdol Amir Bostani 《Journal of plant nutrition》2020,43(8):1070-1079
AbstractZinc (Zn) as a microelement plays a salient role in the vital processes of plants such as metabolism and nutrition. This experimental study was conducted in the research field of Agriculture Faculty, Zanjan University using two genotypes of canola as main factor (Okapi and Tassilo) and zinc fertilizer application method in 7 levels including control, foliar spraying (2, 3.5, and 5?g/L) at the beginning of flowering and soil application (25, 50, and 75?kg/ha) were considered as sub-plot factor. The results showed that the application of zinc significantly increased the chlorophyll content as compared to control treatment. The highest chlorophyll content was observed in foliar spraying of 3.5 and 5?g/L zinc in Okapi cultivar. While, the highest value of RWC content resulted only with spraying 5?g/L of zinc. The result showed that zinc foliar of 5?g/L obtained the highest oil and seed yields and seed yield components. In addition, the highest qualitative seed traits (oil and protein content and zinc content in seed and plant) resulted with spraying 5?g/L of zinc. Also, Okapi cultivar had more quantitative and qualitative yields than Tassilo cultivar. The foliar spray of 5?g/L Zn can be recommended to increase the quantity and quality seed yield of canola. 相似文献
45.
Physical properties of horticultural products are important in designing the sorting, transporting, processing and packaging systems. Among physical attributes, dimensions, weight, volume, projected areas and porosity are useful for designing grading systems. This study carried out on four superior walnut (Juglands regia) genotypes, which were selected from primary morphological screening of 608 genotypes in Neyriz city, Iran. G-570 with higher nut weight (12.46 g), kernel weight (8.25 g) and kernel ratio of 66.21% was a promising genotype among others. Regarding studied physical properties, G-570 was 44 mm in diameter significantly different from other genotype. In this research walnut mass was predicted by using different physical properties with linear and nonlinear models as three classifications (dimension, projected areas and volume). Results showed that the highest correlation was between models number three, two and one. Among grading system based on dimensions in walnut (first classification), minor diameter model with nonlinear relation was the best and could be considered as a good model for economical and horticultural designing systems. 相似文献
46.
Hossein Ouraji Khosro Jani Khalili Ghaffar Ebrahimi Seyed Ali Jafarpour 《Aquaculture International》2011,19(4):683-691
Kutum Rutilus frisii kutum is known as a valuable commercial species in the southern part of Caspian Sea. Artificial rearing of fry has been introduced
as an alternative to supply kutum fry in order to restock the kutum population in the Caspian Sea. The aim of this study was
to find the suitable time to transfer kutum larvae from live food to artificial feed. The experiment began on day 3 post-
hatching and lasted for 21 days. Mean initial weight of larvae was 4.5 mg. Five experimental groups including Group A (zooplankton
alone for 21 days), Group B (12 days zooplankton + 9 days artificial feed), Group C (8 days zooplankton + 13 days artificial
feed), Group D (4 days zooplankton + 17 days artificial feed) and Group E (artificial feed alone for 21 days) were considered
for this experiment. According to the obtained results, the specific growth rate of kutum larvae varied from 8.01 to 13.58%
day−1, and the highest and lowest specific growth rate were found in A and E treatments, respectively. The lowest mean body weight
(24.6 mg) was found in larvae fed on artificial feed for 21 days. However, survival rates of kutum larvae fed mixed zooplankton
for 8 and 12 days (85.83 and 89.33%, respectively) were comparable with those of larvae fed live food during the entire experiment
(91.6%). The lowest survival rate (69.16%) was found in larvae fed artificial feed during the entire experiment. 相似文献
47.
48.
Goldfish, carp and trout gills were incubated with 3H-17-hydroxyprogesterone (17P). With goldfish gills, the metabolites were 17,20-dihydroxy-4-pregnen-3-one (17,20P; 82%), 17,20-dihydroxy-4-pregnen-3-one (17,20P; 8%), 11-ketotestosterone (KT) glucuronide (5.4%) and 17,20P glucuronide (0.2%). Sulfates were not detected. Carp gills converted 17P into 17,20P (11.2%), 17,20P (9.6%), KT (8.4%), glucuronides of 17,20P (1.3%) and 17,20P (1.6%) and sulfates of 17,20P (5.1%) and 17,20P (7.2%). 17,20P (38% free, 1.8% glucuronide and 21.1% sulfate) was the sole metabolite of 3H-17P in trout gill incubations. In the presence of high (10; µg ml-1) substrate concentration, cyprinid gills gave predominantly free 17,20P, while trout gills yielded only free 17,20P. Production of 17,20P, predominantly as its sulfate, from endogenous precursors was demonstrated in trout gills but was not stimulated by trout primary extract. Our results demonstrate for the first time the steroidogenic potential of teleost gills and suggest that they may play a role in secretion of pheromones in some species. 相似文献
49.
Somayeh Omidi Marziyeh Ebrahimi Hossein Janmohammadi Gholamali Moghaddam Zolfaghar Rajabi Babak Hosseintabar-Ghasemabad 《Journal of animal physiology and animal nutrition》2020,104(1):178-185
The present article was conducted to evaluate the effect of in ovo injection of arginine on hatchability, immune system and caecum microflora of broiler chickens. For this reason, 300 fertile eggs were used in a completely randomized design with three experimental treatments. The experimental groups included: 1%–0.5% l -arginine (100 eggs), 2%–1% l -arginine (100 eggs), 3- control [included both sham control (injection of distilled water; 50 eggs) and control (no injection; 50 eggs)], which were injected on d 14 of incubation. After hatching, chicks of each experimental group (0.5% l -arginine, 1% l -arginine, and control groups) were randomly divided into four equal groups (as replicates) and reared for 30 days. Weight and feeding of chickens were recorded. Next, blood samples of chickens were collected on day 30 to evaluate antibody titre. Also, chickens were slaughtered on 24 and 30 days of the experiment to evaluate immune system organs and caecum microflora. Based on the results, in ovo injection of l -arginine had no significant effect on hatchability, body weight, antibody titre, spleen, bursa of Fabricius and thymus weight (p > .05). On the other hand, treatments significantly affected feed intake and feed conversion ratio (p < .05). As a novel finding, in ovo injection of l -arginine increased caecal Lactobacillus (p < .01), while decreasing Coliform and Escherichia Coli bacteria (p < .01). However, treatments did not influence caecal Enterococcus (p > .05). The overall results indicated that in ovo injection of 0.5% l -arginine had a better improving effect on caecal microflora and then considered as a recommended level of the present experiment. 相似文献
50.
A Matini Behzad B Ebrahimi AR Alizadeh V Esmaeili A Dalman L Rashki AH Shahverdi 《Reproduction in domestic animals》2014,49(4):599-605
Our aim was to evaluate the effects of fish oil feeding on sperm classical parameters, level of reactive oxygen spices (ROS), spermatozoa death incidence and in vitro fertilization (IVF) rate in rams. We randomly assigned nine rams, into two experimental groups (isoenergetic and isonitrogenous rations with constant level of vitamin E supplement): control (CTR; n = 5) and fish oil (FO; n = 4, 35 g/day/ram). Diets were fed for 70 days during the physiological breeding season. After a 21‐day dietary adaptation period, semen was collected weekly from each ram by an artificial vagina. Sperm classical parameters were determined by the computer‐assisted sperm analyzer system (CASA), and it was prepared for IVF process by swim‐up technique. These evaluations were performed during the first and last weeks of sampling. Intracellular ROS level and spermatozoa death incidence were detected by flow cytometry on a weekly basis after adaptation. Data were analysed with SPSS 15. The volume, concentration (3.6 and 2.7 × 109/ml) and sperm progressive motility (60 and 48%) were significantly improved in the FO group compared with the CTR (p < 0.05). A comparison of two‐cell stage embryos following IVF in the two groups showed a significantly higher fertilization rate in the FO group (56%) compared with the CTR (49%). Superoxide anion (O2?) rate was significantly lower (p < 0.05) at the third week of sampling in the FO. Although the H2O2 rate was numerically lower in the FO group compared with the CTR, this difference was not significant. In addition, apoptosis showed a significant difference in the third week of sampling (15 and 30% for FO and CTR, respectively; p < 0.05). Overall, adding fish oil to the ram diet not only improved sperm quality and IVF results, it also could reduce oxygen‐free radicals and the incidence of spermatozoa death. 相似文献