The guy I get the pullets of insists I stay on a growers ration (15%) until week 19-20 we get them in at 16 weeks. He maintains the higher grade ration brings them into lay too early and you loose out in egg size! I'm not convinced tho. At what week did you start them on the super start lay?Erm? 16.5 % I think but I’d need to look. We used a super start lay ration somewhere up near 18% on housing the birds to try and drive bodyweight quickly and therefore egg weight, seems to have worked well. Then dropped down to normal peak lay now on post peak.
Feed companies seem to all have different names for their rations, they need standardising!