Cattle digest feed mainly in the rumen. Microbes in this chamber break down plant material. The balance between fibre and concentrate strongly affects this process.
Fibre-rich diets keep rumen pH more stable. Fibre stimulates chewing and saliva production. Saliva contains buffers that prevent sharp drops in acidity. As a result, rumen pH usually stays within a healthy range of 6.0 to 6.8.
Concentrate-rich diets change this balance. Concentrates ferment quickly and produce large amounts of acid. Consequently, rumen pH often falls below 6.0. Low pH reduces the activity of fibre-digesting microbes.
Nutrient utilisation also depends on this ratio. Moderate fibre levels support efficient fibre breakdown. Animals then extract more energy from roughage. In contrast, very high concentrate levels can lower fibre digestion.
However, some concentrate improves overall energy intake. It supplies readily available carbohydrates. This helps high-yielding cows meet their energy needs. The key lies in finding the right balance.
Farmers therefore adjust the fibre-to-concentrate ratio according to the animal’s needs. Dairy cows in early lactation often receive more concentrate. Growing or draught animals usually perform better on higher fibre diets.
Proper ratio management protects rumen health. It also improves feed efficiency and animal performance. Regular monitoring of rumen pH and feed intake helps maintain this balance.
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