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Abstract

A 12-week growth study was conducted to investigate the effects of dietary vitamin A (VA) on growth performance, blood biochemical indices and body composition of grass carp. Six isonitrogenous and isoenergetic semi-purified diets were compounded with different VA level at 68, 328, 599, 1327, 2584 and 4769 IU/kg diet, respectively. The specific growth rate (SGR) increased significantly (P<0.05) with dietary VA level, and the highest SGR value was at 4769 IU/kg group. However, the feed conversion ratio (FCR), feeding rate (FR) and survival rate (SR) of juvenile grass carp were not significantly affected by dietary VA level (P>0.05). As the VA level increased, hepatosomatic index (HSI) increased significantly, peaked at the 1327 IU/kg group (P<0.05), and then showed a decreasing trend. Serum superoxide dismutase (SOD) activity in the control group was significantly lower than those in other groups and then increased with dietary VA level. Whereas, serum alkaline phosphatase (ALP) activity first increased and then decreased with dietary VA level, reaching the highest point at 1327 IU/kg group. No significant difference was observed on the whole body composition among treatments (P>0.05). In conclusion, appropriate dietary vitamin A supplementation could be helpful for the growth and antioxidant capacity of grass carp.

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“…At the end of the experiment, five fish were sampled randomly from each tank and were anesthetized with MS222 at 50-75 mg/L, and about 3 mL of blood was drawn from the caudal vein, using a non-heparinized syringe after they were starved for 24 h. Then, blood samples were introduced to both heparinized and non-heparinized tubes in order to perform haematological and immunological studies, respectively. Serum samples were attained after centrifugation (4500 g for 10 min) and stored at -20 °C until analysis for immunological studies (Lewis, Bain & Bates, 2001;Imanpoor & Roohi, 2015;Wu, Zhu, Liu, Chen, Chen & Tan, 2016).…”

Electric and Magnetic Properties of Bi0.80Ba0.20FeO3‐Doped Ba0.85Ca0.15Ti0.90Zr0.10O3 Ceramics Prepared via the Solid‐State Combustion Technique

“…Due to environmental concerns, lead-free ferroelectric materials, such as Bi 0.50 Na 0.50 TiO 3 (BNT), K 0.50 Na 0.50 NbO 3 (KNN), and BaTiO 3 (BT), have been widely studied in recent decades to replace lead-based ceramics. [1][2][3][4] Among the lead-free ferroelectric materials, BT ceramics have attracted attention from many researchers because it exhibits a high dielectric constant at the Curie temperature (ε C % 6000). [5] However, BT ceramics have a low Curie temperature (T C ¼ 120 °C) and a low dielectric constant at room temperature (ε R % 2500).…”