The optimum proportion of feed for cattle depends on several factors such as age and weight, activity level and stage of production (e.g. growth, breeding or lactation). In addition, the nutritional composition of the available feed ingredients will also influence the optimum ratio.

In general, a balanced diet for cattle should include a combination of roughage (e.g. hay or silage) and concentrates (e.g. cereals or protein supplements). Roughage provides fibre and bulk, while concentrate feeds provide energy and protein.

A common ratio for beef cattle diets is 60% roughage and 40% concentrate. For dairy cattle this ratio may be closer to 50/50. however, these ratios can vary depending on the specific needs of the cattle and the availability and cost of feed ingredients.