Ermmm I'll try an translate.....
"I just can not use because once the taming? Then I do not anymore! And how many times I have to use the taming?"
So I'm guessing you tamed a sheep/cow and it then broke free and attacked you again?
Now I have never tamed a sheep/cow however I have read the wiki/Jorbs posts about taming animals and I believe you have to tame it 5 or 10 times. The animals themselves have taming points and each time you successfully tame it, it adds points to the animals total tameness. To Morph or metamorphose a wild sheep/cow it needs to have %100 tameness points and you cannot attack the animal while taming or the points will be lost.
Please correct me if I'm wrong, like I said never tamed anything.
Here is the wiki, it's in english but I think you can change the language somehow.... Hope it helps

- link:
http://havenandhearth.wikia.com/wiki/Taming