I just saw my 6 month old Boer buck try to breed my Nubian doe, Sabine, who is the tallest doe I have and he was having trouble reaching. However, he did penetrate and throw his head back but she didn't arch her back and then acted as though he didn't get the job done. She immediately began chasing after him again. I wonder if he didn't penetrate deep enough or does it even matter? I imagine he'll try again later. If not, I have a couple more months.