牛肉对小白鼠体质量及运动能力的影响

Effect of Beef Supplementation on Body Weight and Sport Performance of Mice

目的:探讨牛肉对小白鼠运动能力的影响。方法:雄性小白鼠50只,随机分为2组,对照组20只、牛肉组30只,单笼饲养。限制采食量,初始量为6.0g/(d·只),喂养4周。测小白鼠力竭运动时间、抓力、体质量,取肝组织和后腿肌肉测定肝糖原、肌糖原含量。结果:牛肉组与对照组相比。有降低体质量,增加速度,提高游泳力竭时间和抓力的趋势,但无显著差异。采食牛肉后,不论对小白鼠是否施加负荷,都能提高肝糖原、肌糖原、血清SOD水平(P<0.05),能显著降低MDA水平(P<0.05)。结论:在日粮蛋白质和能量摄取量相同条件下,牛肉日粮具有控制小白鼠体质量和提高小白鼠的抓力和游泳力竭时间的趋势。不论是否附加负荷,都能提高肝脏和肌肉组织的糖原水平,并且显著提高机体的抗氧化能力。

Objective： To investigate the effect of beef supplementation on body weight and sport performance of mice. Methods： Fifty male mice were randomly divided into two groups： control group （n = 20） and beef group （n = 30）, with each mouse in separate cages. During the first four weeks, the intake of mice were limited to 6.0 g/d. Exhaustion time of exercise, holding power, body weight were measured before mice were immediately slaughtered and the tissues of liver and hind leg muscle were sampled. Results： Body weight gain in beef group tended to decline compared with control while exhaustion time of swimming and holding power tended to increase （P 0.05）. For beef group, liver glycogen, muscle glycogen, and serum SOD in mice increased （P0.05） while the serum MDA level was reduced （P0.05） with or without extra load. Conclusion： Under the same dietary protein and energy intakes, the ration with beef included enables mice to have a stable body weight and increase holding power and exhaustion time of swimming, as well as to increase glycogen levels in liver and muscle tissue and significantly improve the animal s antioxidant capacity no matter whether there was additional load to mice.