I have 10 White Chanteclers that are 30 weeks old. About the last 3 weeks I have been getting 2 eggs per day. Is it normal that only 2 of the 10 hens are laying at this point in time? Also one of them is laying a double yoker about once a week. Have had hens in the past and when one started to lay most were laying within a couple of weeks. Thanks!