[免疫学实验技术] 恳请大家耐着性子帮忙翻译一小段英文

求高人帮忙，翻译小段洋文来者好啊！真期待你看完贴后能帮忙翻译下。。。。不省感激！！！
      下面一段话困扰我许久，请英语好的帮帮忙，翻译一下，不用全部翻译，主要是红色部分，我有点蒙，不清楚具体是怎么做得，如何饲喂，恳请指教，举例说明更好，不胜感激！
L. casei administration. The mice were divided into four experimental groups.
In three of them, mice were housed in individual boxes and given L. casei CRL
431 for 2, 5, or 7 consecutive days at 108 CFU/ml/mouse/day. The cells were
suspended in sterile 10% (vol/vol) nonfat milk and administered at 1% (vol/vol)
in the drinking water. The mice in the control group received 10% nonfat milk
in the drinking water under the same conditions as the test groups. The volume
drank, controlled daily, was 2.5 to 3 ml in both experimental and control groups.
Histological samples. At the end of each administration period, the animals
were killed, and the small intestine was removed for histological preparations
following Sainte-Marie’s (31) technique for paraffin inclusion.
翻译我到还可以，就是理解不上去--将菌体细胞（浓度已经确定）加到10%（v/v）脱脂牛奶中，再将脱脂牛奶以1%的添加量再添加到饮用水中之后，每天保证小鼠饮用2.5-3.0ml，那样的话还能够有足够的乳酸菌到达小鼠肠道并发挥作用吗？是要保证小鼠每天摄入10的八次方 CFU/ml的菌吗，那么多？？？疑问点所在。。。