Clarification needed. The "rule" that says females are ready after third winter... does that mean they are ready on third winter or after third winter?

For example... a hatchling that is born in April of 08....

winter of 08 would be #1
winter of 09 would be #2
winter of 10 would be #3
winter of 11 would be #4

Assuming they are close to appropriate breeding weight (1200 - 1500 grams) in October of winter #3 would you breed it that winter? Or is the rule saying you should wait for breeding season in winter #4?

Thanks.