What exact you are trying to do. First why you want to give ethanol to mice reproductive tract??

i suggest u to answer the questions by yourself by experiment.

Ethanol causes infertility and testicular tissue with apoptosis.

Is onion extract can play a protective role ?

I think it is a novel subject and it can be interesting to do. congratulation to you.

tank u very much dear pourya

It depends on what effects you expect the ethanol to induce. A simple approach would involve checking the motility, vitality and count of the sperm collected from the cauda epididymis, and looking at testis morphology.