There are several reasons why distillers grains are good for the nutrition of beef cattle:

1. High in protein: Distillers grains are a rich source of protein, making them an excellent supplement for cattle diets. Protein is essential for muscle development, growth, and overall health in cattle.

2. Energy-dense: Distillers grains are also high in energy, providing a concentrated source of calories for cattle. This can help support weight gain, milk production in dairy cows, and overall energy levels in cattle.

3. High in fiber: Distillers grains contain a good amount of fiber, which is important for digestion and gut health in cattle. Fiber helps maintain a healthy rumen environment and can aid in preventing digestive issues.

4. Nutrient-rich: Distillers grains contain a variety of essential nutrients, including vitamins and minerals, that are beneficial for cattle health and performance.

5. Cost-effective: Using distillers grains as a feed ingredient can be cost-effective for cattle producers, as it provides a nutritious and high-quality feed option that can help reduce overall feed costs.