Abstract:An experiment was performed to evaluate the effects of different drying methods with different pre-treatments on the physico-chemical, microbiological, and sensory properties of the silver carp, Hypophthalmichthys molitrix. In order to achieve this objective, the collected fresh fish were dried using traditional (without any pre-treatment), improved (fish soaked in a 5% salt solution for 10 min and then treated with chili powder (0.3%) and turmeric powder (0.3%)), and solar tunnel (fish soaked in a 5% salt solution for 10 min) drying methods. The results showed that the dried fish produced by the solar tunnel drying method were rehydrated more rapidly than the products produced by the traditional and improved drying methods. The moisture content of the dried H. molitrix was varied from 18.24 to 25.43% on a fresh matter basis. There was no significant (p > 0.05) difference found regarding the protein, lipid, and ash content among the different drying methods on a dry matter basis. The total volatile base nitrogen (TVB-N) contents ranged between 37.58 and 45.03 mg/100 g, and significantly (p < 0.05) the lowest TVB-N was observed in dried fish produced by the solar tunnel drying method. Moreover, the highest peroxide and acid values were found in the traditionally produced dried fish as compared with the fish dried by the improved and solar tunnel drying methods. The aerobic plate count of dried fish ranged from 4.52 to 7.51 log CFU/g. The sensory evaluation results revealed that the solar-dried products showed superior quality than the products produced by the traditional and improved drying methods. The results revealed that the dried fish produced by the solar tunnel drying method provided the best product in terms of physico-chemical, microbiological, and sensory aspects.
An investigation was carried out to compare the physical, chemical, microbiological and sensory properties of three freshwater dried fish products of Wallago attu Bloch & Schneider, 1801 (Siluriformes: Siluridae), Channa striatus (Bloch, 1793) (Perciformes: Channidae) and Glossogobius giuris (F. Hamilton, 1822) (Perciformes: Gobiidae). The traditionally sun dried fishes were collected from Kawran Bazar Fish Market, Dhaka, Bangladesh. Results showed that the water reconstitution properties varied among the dried fishes where maximum rehydration was observed in the C. striatus at room temperature, 40 oC and 60 oC. Moisture content of W. attu, C. striatus and G. giuris were 22.70% +/- 0.45%, 18.75% +/- 0.58% and 21.93% +/- 0.54%, respectively; the protein content were 61.85% +/- 0.99%, 66.44% +/- 1.02% and 62.83% +/- 0.87%, respectively; the lipid content were 6.21% +/- 0.93%, 6.81% +/- 0.72% and 5.98% +/- 0.55%, respectively, and the ash content were 6.79% +/- 1.11%, 6.49% +/- 1.29% and 7.83% +/- 0.98%, respectively. Peroxide value, acid value, pH, TVB N value and aerobic plate count were found to be highest in W. attu followed by G. giuris and C. striatus. Results of this study revealed that traditionally sun dried fish products were acceptable quality in terms of physico-chemical, microbiological and sensory aspects.
The aim of the present study was to evaluate the effect of different anti-stressors on growth performance, carcass traits, bloodchemistry and meat quality attributes of broiler Japanese quail. For this purpose, a total of 1,875 quail chicks were procured and arranged according to completely randomized design, birds were divided into 5 treatment groups having 5 replicates of 75 birds each. The treatments consisted of four anti-stressors i.e., synthetic anti-stressors (Vitamin C and Betaine) and natural anti-stressors (Turmeric and Chia Seed) along with a control group. Bird's diets were supplemented with vitamin C, betaine, turmeric and chia seed @ 600 mg/kg, 700 mg /kg, 300 mg/kg and 7,000 mg/kg, respectively. After four weeks, 10 birds per treatment were slaughtered (Halal method), de-feathered, eviscerated and their carcass traits, serum chemistry and meat quality attributes were calculated. Birds supplemented with betaine revealed significantly (p≤0.05) lower feed intake, glucose, cholesterol, H:L ratio, better weight gain, times of gain, FCR and highest anti-oxidant assay and total viable count. However, carcass traits, processing traits and blood cortisol level did not differ (p>0.05) among the treatment groups. In conclusion, addition of antistressors (especially betaine) in the diet of growing Japanese quail had positive influence on growth and serum chemistry. IntRoduCtIon Japanese quail (Coturnix japonica) were initially domesticated as pet song birds or as game birds then with time they were converted into valuable meat type birds (Kayang et al., 2004). Japanese quail is a domestic bird of economic importance for commercial meat production and lay unique flavor eggs (Mahmoud El-Tarabany, 2016). Japanese quail are the best meat producers among all the quails present in the world with an average adult live weight at four weeks of age of 200 grams (Ahmad, 2016). Japanese quails are excellent laboratory animals used for research purposes as they have low maintenance cost, short generation interval (3-4 generation per year), hardy, resist disease, high egg production and require lower space and equipment utility (Minvielle, 2004). Role of environment cannot be denied as commercial and intensive poultry production is associated with various stresses leading to the decrease of productive and reproductive performance of growing chickens, parent birds, and layers (Surai & Fisinin, 2016). Japanese quails are also affected by various environmental and management stresses that affect their productivity during humid hot season (Bello & Sulaiman, 2016). Pakistan is located in geographical regions of southwestern Asia and situated in both northern and eastern hemisphere, where, July and August are considered to be humid hot months (Daghir, 2009). During these months the birds experience a series of stresses, among these eRBCA-2019-0734
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