Depends on how many young birds you want to race,if you have enough to breed off so that a second round aren't too young to get on the road,it's ok to breed in April,if you need more young you might have to breed sooner.I was just working on giving any of this years latebreds that you want to breed off time to mature a bit.You'll also find breeding birds Aril/May time they seem to grow better and obviously not racing O/Bs you can concentrate on the breeding ,once you get in full swing mate,you'll want to breed in January if not December,again JMO Lindsay.