I agree, take time and think about if you want your buck to run with your does. I have always done it this way, the pros were way better then the cons. You will not miss a heat if they didnt take the first time, and you catch that first heat after weaning your kids, if thats the way you want to, I do as long as they are fit enough to be bred. But after now 5 years of having these goats I am changing things up a little. I have found that I have more health issues with new borns during the winter then any other time of the year, so right now I am building my buck pen to put them away and turn back out so the girls will kid in march or later. Now about the purebred thing, its up to you but it sounds like you kinda run your goats like I do, they eat brush and for the most part find their own food. I have learned over the years, and I strongly belive that no matter the goat they are just as hardy as you make them be. I have purchased some 100% at a young age and they are just fine, no issues. I have bought some expensive pampered pets, and it seem the most I spent on the goat the more health issues they have. So with that said, if you go with a purebred get it at a young age. Thats what I do with all my bucks and they are fine. I will not buy another goat over the age of 5 months, its hard for them to adjust to any difference in life style.