I have approximately 20 hens 1/2 are new hampshire reds and not sure what the other breed is and they are 9 months old. They are not laying eggs at all. I feed them 16% pellet feed and give them oyster shell and plenty of water. They have plenty of room in the coop and I even put a light in there. I've tried putting golf balls in the nests to promote laying and none of this is working. Is there anyone that can help me?