Correct Option
The correct option isIt consists primarily of fibrous indigestible material.
Explanation
In animal husbandry, animal feed is broadly classified into two main categories based on fiber content and nutrient density: Roughage and Concentrates. A balanced ration for livestock typically requires a mix of both to ensure proper digestion and nutrient absorption.
Option Analysis
- It has a high concentration of proteins. is incorrect: Feeds that have a high concentration of proteins and other nutrients are classified as Concentrates. Examples include oil cakes, gram chaff, and molasses.
- It consists primarily of fibrous indigestible material. is correct: Roughage is characterized by a large bulk volume and high fiber content. It consists primarily of fibrous, indigestible material (such as cellulose) and is generally low in nutrient density compared to concentrates. Common examples include green fodder, hay, silage, and straw. This fiber is essential for the proper functioning of the rumen in cattle.
- It is used exclusively for sick animals. is incorrect: Roughage constitutes the staple diet for healthy livestock, particularly ruminants like cows and buffaloes. It is not a special diet reserved exclusively for sick animals.
- It contains high levels of carbohydrates and low fibre. is incorrect: Feeds containing high levels of carbohydrates and low fiber content fall under the category of energy-rich concentrates (e.g., cereal grains like maize and barley), not roughage.
Key Takeaway: The primary distinction in animal feed is that Roughage is high in fiber and low in nutrients, providing bulk, whereas Concentrates are low in fiber and high in proteins and other nutrients.