Concentrates are low in fibre and high in proteins and nutrients.
Explanation
Cattle feed is broadly classified into two main categories based on nutrient density and fiber content: Roughage and Concentrates. A balanced diet for cattle requires a mix of both to ensure proper digestion and productivity.
Detailed Analysis:
- Roughage: This type of feed is bulky and contains a high amount of fiber but is relatively low in essential nutrients. It is primarily derived from fodder, hay, and silage. Its main function is to aid digestion by adding bulk.
- Concentrates: These are feed mixtures that are low in fiber but contain relatively high levels of proteins and other nutrients. Examples include grains (maize, oats), oilseeds, and oil cakes. Concentrates are crucial for growth, maintenance, and milk production.
Option Analysis:
- Concentrates are high in fibre and low in nutrients. is incorrect: High fiber and low nutrient content define Roughage, not Concentrates.
- Concentrates are low in fibre and high in proteins and nutrients. is correct: Concentrates are characterized by low fiber content and high nutrient density (proteins, fats, carbohydrates).
- Concentrates are exclusively composed of green fodder. is incorrect: Green fodder is typically classified as roughage. Concentrates are usually grain-based or industrial by-products.
- Concentrates are used only for non-lactating animals. is incorrect: Concentrates are vital for lactating animals to meet the high energy and protein demands of milk production.
Key Takeaway:
The primary distinction in cattle feed is that Roughage is high in fiber and low in nutrients, whereas Concentrates are low in fiber and high in proteins and nutrients.