My twin-bearing Southdowns (one of the breeds used to create the Suffolk, along with the Norfolk Horn) and Badger Faced (some pure bred, some in lamb to a Southdown) are on 100g twice a day for lambing minus weeks 6 and 5, then 200g for a week, then 300g, then 400g, then 450g for the final week and into lambing. Grass is low and quality poor so they've been getting ad lib hay since Christmas. I find this regime produces decent sized lambs and a good supply of milk but nothing too large. The only time I change this is if one of the older ewes scans with twins and I start her on 100g twice a day at minus 8 weeks.