Amir Masoud Sadr there are plenty of articles available for testosterone doses in rats however, the important thing here is the disease in which you want to test testosterone as different diseases have different doses

Hello Sir Amir Masoud Sadr ,

You Can search in literature, you will find plenty of articles using a different dosage of testosterone, and some times the effect of testosterone treatment can be dose-dependent or depends on the duration of treatment. kindly find some articles that may help you:

Article Testosterone and dihydrotestosterone differentially improve ...

Article Rewarding Properties of Testosterone in Intact Male Mice

https://www.nature.com/articles/s41598-017-19104-0

Article Testosterone treatment of aged male mice improves some but n...

https://academic.oup.com/endo/article/151/11/5428/2456121?login=true

https://www.sciencedirect.com/science/article/abs/pii/S0018506X02918386

Article Continuous testosterone administration prevents skeletal mus...

Goodluck