lactogen

例句：

1. 1.The lactose in milk is essential for the growth of bacteria in the digestive system.
   牛奶中的乳糖对消化系统中细菌的生长至关重要。
2. 2. Lactogen is a hormone that stimulates the production of milk.
   乳原激素刺激乳汁的产生。
3. 3. Lactogen deficiency can lead to lactose intolerance, which can cause discomfort and bloating.
   乳原激素缺乏可能导致乳糖不耐症，这会引起不适和胀气。