I've raised Boer goats for almost 10 years now and I rarely, if ever, breed a doe in her first year, but then, I'm in a cold climate. My kids are born in May or June, so when the breeding season rolls around again in Dec. the kids are only 6 or 7 months old. They are going into a hard winter at a time when they still have a lot of growing to do, so I hold them over and breed them the following year. That means they are coming 2 years old when they kid out for the first time. In a warmer climate, you could probably breed them in their first year. Chances are, they would have been born earlier in the year and can reach a good weight/age before breeding.