Как бы вы здесь перевели? /латинский/

Semper cornuti non audent cornibus uti. = Oxen always do not dare to use (their) horns.

Cornibus vel uti nesciunt, vel non audent. = Either they don't know how to use horns, or don't dare to.

Cum sint cornuti, non audent cornibus uti. = ?здесь? , главное предложение переведено, а вот придаточное "Cum sint cornuti"?

sint - subjunctive mood (may they be)

cornuti. of the Latin noun Cornutus, means:
1.horned
2.bullocks
3.a Roman
4.a grammarian
5. Cornutus, философ, родом из Лептис (Африка) , изгнан Нероном в 68 г.

Может так: At the time when they (bullocks) are horned, they don't venture horns to use. (Since they are horned, they don't venture horns to use.)