When I had a small milking herd, 60 Max, they were fed D&H sheep nuts with warm soaked sugar beet , ad lid meadow hay and grazed outside in the summer. They were milked by machine and the highest yeald I had was 1900 . When available they had extras such as carrots, peahulm and fruit and veg.
I bred kids and they always grew well and milked as expected according to parentage , breed etc.
I have also always bred ewe lambs in their first winter having experienced them getting rather large by their second winter. They need close monitoring but also do well.