New at posting. I have 110 Plymouth barred rock layers. 12 months old. They have sharply dropped the egg production in just a few day to only a few eggs a day! They haven't been as ambitious to eat I have noticed in the last week or so too. I noticed it all happening at the same time when we got a cool snap here in Southeastern NC. Thought it was the weather. I'm not sure what to look for in the flock!! Worried to pieces. I bought 50 new pullets a couple of weeks ago. They are separated by a fence. The new ones aren't quite laying yet... Someone suggested to look around the vent for lice....I really don't see anything and not sure what they look like. Please share ideas if you have had this experience or know what I should do. Thanks so much.