We faced the same question this past January with a mixed flock of 8 bantams. Being the middle of winter it was anyone's guess when they might start laying. As first time chicken people, we read everything we could find and finally decided to go with the feed manufacturers guide and switched...
We have one too many roos for our small backyard hobby. He was hatched in mid November, 2013. We will gladly deliver, within a reasonable distance, to see that he is placed in a good home. He is located in Huntington, WV, which is located at junction of West Virginia, Kentucky and Ohio.