In cattle, out of the total dry matter (feed) requirement, ______ should be met by roughages and the rest by concentrates.

Correct option is B

In balanced cattle nutrition:
Roughages (fibrous fodder) = about 2/3 of total diet
Concentrates (grains, oil cakes) = remaining 1/3
Roughages maintain rumen health, while concentrates provide high energy.
✅ Correct ratio: 2/3 roughages : 1/3 concentrates → Answer: (B)