I have Production RIR and I am having a terrible cockerel to pullet ratio when hatching. I have hatched 3 clutches so far this year. The first I had 5 cockerels and 3 pullets , the second I had 2 cockerels and 3 pullets and the third I had 7 cockerels and 3 pullets. All of these have come from my base flock of 3 pullets and 1 cockerel (they will be a year old in July). I am super new at breeding and genetics. Can some explain why they are producing so many males and what can I do to fix it?