What breed are your goats? If they are seasonal breeders, they will only get pregnant once a year even if kept with a buck all the time. If they are Boers or miniature, then I wouldn't as they will kid about twice a year, which would be a lot of stress for them.
Then there's the issue of the temperament of the buck, whether you want to know the exact date the does are bred, etc. And a buck will sometimes harass does in late pregnancy, causing them to go into premature labor, so you should keep him out if he does that.
Father breeding daughter is usually no big deal; just try not to let the goats become too inbred. Sometimes a defect can pop up, but more often than not the kids are normal.
So if you take all this into account and it works for you - go for it! That's how they live in the wild.
Oh, and young does come into their first heat at ~ 3-4 months. They really shouldn't be bred until they are much closer to adult size.
Jesus said, "I am the resurrection and the life.
Whoever believes in me, though he die, yet shall he live:
and everyone who lives and believes in me shall never die."
Think not that life owes you a debt;
To lose it is to live;
'Twas not bestowed on you to keep,
But to give, and give, and give.
Don't clasp it close, but fling it wide!
Do good to great and small.
Keep no account of loss or gain;
Ask nothing, and give all.
Last edited by milkmaid; 01-15-2013 at 02:49 PM.