I got 3 silver leghorns in April 2015 along with 2 Amaraucanas and 2 blue Wyandottes,. The Amaraucanas and the Wyandottes have been laying for about a month, but the silver leghorns are not. The Amaraucanas and Wyandottes are laying consistently every day to every other day. Not sure what is going on. Any suggestions about what might be going on?