Sorry, but you cannot turn a stallion into a mare; nor a mare into a stallion.
You can turn a stallion into a gelding, however.
Funny how evolutionists think it works differently for humans.
Judge orders Idaho to give transgender inmate gender surgery
News > Idaho UPDATED: Fri., Dec. 14, 2018, 7:03 p.m. BOISE – A federal judge says Idaho must provide gender confirmation surgery to a transgender inmate who has been living as a woman for years but who has continuously been housed in a men’s prison.