I own a couple of holstein heifers. One of them started cycling when she was around 10 months old. I can definitely tell when she is cycling. The other heifer I have is probably about 18 to 19 months old. I haven't noticed her cycling at all. She doesn't show the normal signs my other heifer shows when she is in heat. I know everyone's first thought might be that she is a free martin, but I got her from someone I know and I doubt this is the case. I am not sure what to do, anyone got any tips?