Our little ND will be 5 months old in the middle of Oct. I was hoping to breed him with our 3.5 year old Nubian who is currently in milk. He is about 45 lbs now, but seemingly quite short compared to the doe. Our Nubian buck who is 1.5 years old was able to breed two other does last year when he was 5 or 6 months old, maybe closer to 6. BUT, this time I have a ND, not a Nubian. Is this even physically possible at such a young age. Do you have to wait until the ND is full grown to breed with a Nubian?