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Cattle Diets and Nutrition

If a cow eats 100 percent food a day how much waste comes out of that?

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December 24, 2009 2:05AM

I believe you are referring to the utilization of energy in cattle. So, if you are referring to a cow eating 100% gross energy in terms of feed (grain, hay, silage, etc.), then the amount of waste that comes from that is in this order:

5% gaseous energy

20% heat energy

30% fecal energy

5% urinary energy

20% Production Energy - Milk, reproduction, growth

20% Maintenance Energy

So therefore, a total waste of 60% is given off and excreted as waste from the gross energy consumed, with only 35% given off as urine and feces.