To Abstract the effect of adding fat, VC,VE and
zinc to diet on improvement of the
rat cold tolerance.Methods: Experiment Ⅰ was intermittent cold exposure. 36
rats were divided into 3 groups with
energy intake from
fat of 20%, 35% and 45% respectively. All of the rats were exposed to 0±1 ℃ for 8 hours and room temperature(about 20 ℃) for 16 hours per day to observe the formation time of clod tolerance. In experiment Ⅱ, other 156 rats were fed with high fat,VC,VE or zinc diet for 4 weeks, then suffered from cold exposure. There were 7 groups, including: ① 7% energy from fat as the control; ② 20% energy from fat; ③ 35% energy from fat; ④ 45% enetgy from fat; ⑤ 35% energy from fat and additional VC; ⑥ 35% energy from fat and additional VE; ⑦ 35% energy from fat and additional zinc. The groups ②③④ had their room
temperature controls. Firstly, the rats were fed with the experimental diet and kept in the room temperature for 4 weeks, then exposed to-15 ℃ for 2 hours, the changes of rectal temperature were Abstractd. Some of the rats in group②③④ were killed to determine the biochemical indexes. The rest were kept in room temperature for 1 week, then exposed to 0±1 ℃ for 3 weeks to Abstract the formation time of cold acclimation.Results: In experimentⅠ, the
cold tolerance in higher fat diet group was better than that in lower fat diet group. In experiment Ⅱ,the rats taking 20% and 35% (energy from fat) diet adapted to cold environment faster than the rats taking 7% or 45% fat diet. Supply of VC,VE and zinc to 35% fat diet could enhance cold tolerance further. Conclusion: High fat diet could accelerate the cold acclimation in rat. VC,VE and zinc had synergistic effects in cold tolerance improvement. Taking high fat diet for a short of time in cold environment did not affect lipid metaboism of rats.
More abstracts about the SYNERGISTIC EFFECTS OF VC、 VE AND ZINC WITH FAT TO IMPROVE THE COLD-TOLERANCE OF RATS