I've always worked to a 17 day cycle rather than 21,will have to investigate whether I'm wrong again
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No, 17 days is more usual, I think. Maybe some breeds are different?
Congratulations, OhLaLa. (I have assumed that since the boy was wearing raddle, you were hoping he would start working soon, hence congratulations rather than commiserations on starting lambing around 19th Jan!)
The girls may start cycling over a period, but once each starts she should cycle every 17 days until fertilised. Having an active tup lamb with them will get them cycling sooner than if they were in a group on their own.
Whether the ewe lamb will come into season this year depends on many things including breed, location, weather, age, condition ... when was she born, what breed is she?