Below is an instruction that describes a task. Write a response that appropriately completes the request in Chinese. Please answer in Chinese.

### Instruction:
 特雷兹的农场上有44头牛。50%的牛是母牛，其中50%的母牛怀孕了。特雷兹有多少头怀孕的母牛？


### Response:
 母牛：44(.50)=22头
怀孕的母牛：22/2=<<22/2=11>>11头