جستجوی مقالات مرتبط با کلیدواژه « meat stability » در نشریات گروه « علوم دام »

This experiment was conducted to evaluate the effects of supplementation of zinc and inorganic selenium in diets containing oxidized oil on performance, antioxidant enzymes activity, and meat quality of broiler chickens. A total of 480 day-old Ross 308 broiler chickens were randomly attributed into 12 treatments with four replicates each with 10 chickens in 2×3×2 factorial arrangement, includes: The thigh was dissected and muscles were removed to assess the malondialdehyde (MDA) content. The results showed that the birds’ average daily FI and FCR were not significantly influenced by dietary treatments. Inversely, the average daily BWG showed a significant difference among treatments over the experimental period (P <0.05). The birds received dietary Zinc at the level of 100 mg showed a higher activity of SOD enzyme (P <0.05). The lowest amounts of GPX was observed in birds fed diets containing oxidized oils, no dietary zinc and selenium at the level of 3.0 mg/kg. The highest and lowest levels of thigh meat MDA levels were noted in birds received diets containing oxidized oil with no dietary zinc and those had given fresh oil diets with supplementary zinc at 100 mg kg zinc and supplementary Se at 0.3 mg/kg, respectively. The results of this study revealed no synergistic effects between zinc and selenium on oxidative enzymes and MDA levels. It is recommended to supplement 100 mg / kg of zinc and 0.3 mg / kg of selenium to reduce the peroxidation effects of dietary oxidized oil.

To investigate the effects of oregano essential oil and canola oil on digestibility, ruminal pH and ammonia and carcass quality of fattening Dalagh lambs, an experiment was conducted with 16 lambs with an average live weight of 25±2 kg in a completely randomized design with 4 treatments (Control diet based on barley grain and corn silage without canola oil and oregano essential oil, control diet supplemented with 2 % canola oil, control diet supplemented with 2 % canola oil and 0.2 % oregano essential oil and diet supplemented with 0.2 % oregano essential oil) and 4 replicates for 80 days. Results indicated that the NDF digestibility (60.06, 54.77, 52.56 and 55.73 respectively) was significantly decreased in lambs fed diet containing canola oil and oregano essential oil. Concentration of ruminal ammonia had significantly decreased with adding oregano essential oil in level 0.2% to the diet. The results also showed that pH and index of meat light color not affected by dietary treatments, whereas color parameters (yellowness–redness) appeared to decrease in control treatment. Amount of thiobarbituric acid was lower in thigh meat stored for 63 days after slaughtering in group received oregano essential oil. According to the results, use of oregano essential oil had favorable effect on ruminal ammonia concentration and the oxidative stability of meat in a long time so it would be considered for storing meat in fridges.