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1 材料和方法 该试验选用湖北省医学科学院实验动物中心提供的纯种昆明小鼠和全价颗粒饲料。纯净水为武汉市顶津食品有限公司生产的娃哈哈纯净水。昆明种鼠于1998年5月20日购回,饲养至70日龄后交配生产。哺乳18天后断奶并从中选出体重11克的雌、雄小鼠各20只作为F_1代并随机分为两组,每组雌、雄各10只。一组采用普通饮水(自来水),另一组采用纯净水饮用,两组采食、饮水不限。生长期每周称重一次,取平均值,第五周后不再称重。F_1代生长至75日龄时采用1:1方式交配、生产。生产后记录其产仔数,窝重,离乳重(均取平均值)。从F_1代个体中再选出雌、雄小鼠各20只作为F_2代,试验方
1 Materials and Methods The experiment selected Hubei Academy of Medical Sciences Experimental Animal Center to provide pure Kunming mice and full-price pellet feed. Pure water for the Wuhan Ding Food Co., Ltd. produced Wahaha pure water. Kunming mice purchased on May 20, 1998 and reared to 70 days after mating production. Twenty-eight days after weaning, weaning and eleven female and male mice weighing 11 g were selected as F_1 generation and randomly divided into two groups, 10 in each group. A group of ordinary drinking water (tap water), the other group of pure drinking water, two groups of eating, drinking water is not limited. Weighing the growth period once a week, taking the average, no weighing after the fifth week. F_1 generation growth to 75 days of age by 1: 1 way to mate, production. After birth, record its litter size, litter weight, weight from the milk (averaged). From F 1 generation of individual and then re-election of the female and male mice of each 20 as F 2 generation, the experimental side