I've gotta say with a single female it's really hit or miss. I bought 7 big females for my first season ( 2009/2010 ), and so far I've had 3 girls ovulate, and 2 more that are close. So if I get 4 or 5 clutches out of 7 girls I'm going to consider myself REALLY lucky.

Also one of my girls seemed to stop developing for about 3 weeks. I figured she reabsorbed her follicles. Then I palpated her, and now her follicles are huge. Go figure.