I'm thinking of introducing a younger (3-4 months old) pygmy billy to my older (2 yr old) nannys. So here's my questions. 1) I do feel really good about the breeder, but should I keep him isolated from my nannys for any given time like you would when you bring in new chickens? 2) do I need to be concerned about the age difference when it comes to breeding them? 3) If not, Will I need to keep him from my nannys even at young age? I don't plan on breeding them until next fall/winter time frame. I do understand that older billys need to be kept separately and have the accommodation for that. Just need more time (about 6 weeks) to fence in one more acre. The other area I could keep him in is very small (breeding pin for chickens 15'x10').