Ile de France ewes have the particular feature and the advantage of having a sexual cycle in periods of increasing day lengths, unlike most meat breeds. This specific characteristic makes the work organisation much more flexible, and work peak periods can be spread out more easily. In an arable crop region, in particular, autumn lambing makes it possible to programme births during the periods when work in the fields has ceased.For others, distributing lambings over time is a way of using buildings and forage areas to the best advantage. 

Photos of births in the open air in winter/summer