10 Green 4Kg Dry in morning 10Kg Green at Ten oclock 15Kg green at three oclock 3Kg Dry 15Kg Green at night. You can use hay at night and reduce green.( This is the pattern my friend is feeding in his farm and getting 12L/time at peak lactation)
Avg 50 Kg Green fodder for a cow weighing 500Kg.
Have you planned for Silage? if so, beware! milk stinks if you feed animals more than 10Kg. most of these points are available in this forum. so try searching with key words cattle feeds/silage/rohdes grass/Napier grass etc in this forum.
If you google you will get a website from Kenya animal husbandry they have given a 100page report on fodder technology. I can share you if PM(non cmmerical)