Goats: How much feed will a goat need per day

[Henlus]

 Thanks for the reply. 
The goats weigh between  45 and 60kg. By comb mix- I meant that that we grind the dry corn together with its comb (Maize comb) and molaplus is more like molasses.

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Going by the calculation given, a 45kg goat will need 1.44kg of grass and hay and 0.36kg of corn-comb mix. A 60kg goat will need 1.92kg grass and hay and 0.48kg corn-comb mix. These are dry matter (DM) values. If we factor in water content the values will increase. Hay has about 90% DM and fresh grass has about 20% DM. So the values will become 7.2kg grass or 1.6kg hay for 45kg goat. For 60kg goat it is 9.6kg grass or 2.13kg hay.
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For corn-comb mix, I don't know their DM value.
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Note that this is theory, so proceed with caution. I hope this helped? What are you currently feeding your goats?