SUMMARY

In order that needs for some milk production was predicted as model was used a cow, body weighs 600 kg. First, needs for maintenance in eight different energy systems had been estimated and than the quantity of standard diet, which satisfied these needs were estimated. The diet consisted of forage and concentrate in proportion 50:50 percentage. The forage consisted: silage of corncobs, hay of alfalfa, hay of meadow plants. Concentrate consisted: pea seeds, corn grain, barley, wheat, soybean seeds- diet solv extd. sunflower diet solv extd., sugar beet-dehy and premix. At the end the quantity of milk, which theoretical could be product from 10, 15 and 20 kg dry matter of diet, was estimated. There are significant variations between different energy systems at needs for maintenance and milk production from 10, 15 and 20 kg dry matter of diet.

          Key words: energy sistems, feeds, dry matter.