hello i have 21 hens and 1 rooster and i haven't got an egg in 3 days.Befor i was usually only getting 1 egg a day my oldest hen is 3 years old my youngest is 12 week most are about 1 year old the others around 2 i feed them layers pellets the same feed i have fed them when they where laying good.they all seem to be healthy and happy.But why no eggs