I understand that for some people it is difficult to harvest a livestock. On the other hand we should understand that farming has never been for those who are weak at heart. There's no type of farming in which some type of killing is not involved. You become a florist and you will have to kill.
Yes, I understand that killing is involved in any kind of farming. But if you hand raise an animal, and watch it grow, and the animal comes to trust you and like you, you can't just chop it's head off.
Also, you can't compare this to flowers. A rooster is a living, breathing being that has feelings just like any other animal. You wouldn't kill a dog just because you don't want it. It's the same with a rooster.