We have four chickens now and two guineas. The guineas are laying fine. The chickens however are not.. the weather is pretty mild here in SC. We have had a couple low 30's nights but now it's low 50's highs in the high 70's and lower 80's. All the chickens were on tetracycline for 5 days and have been off of it for 5 days -they are only a year old, the austrolorp has continued to lay, the others aren't laying with the exception of one soft egg that was laid in the yard..not in a nest box? Anybody have any thoughts?? We have had a terrible problem with cankar worms in our oak trees so they are getting plenty of food to eat...thanks so much!