Tech Seminars #05 – – Using the New NASEM Requirements to Feed Dairy Calves

This presentation was prepared and presented to DCHA in September, 2022.

Click here to view Calf Note #237

Click here for a video transcript

Summary

The 2021 NASEM Nutrient Requirements for Dairy Cattle introduced a more advanced, model-based approach to feeding dairy calves, improving our ability to predict dry feed intake and estimate nutrient requirements. A key concept in the new system is that energy intake drives growth, while protein must be supplied in proper balance to support that growth. Factors such as body weight, liquid feed intake, and environmental conditions influence how and when calves begin consuming dry feed, which in turn affects rumen development and readiness for weaning. Higher milk intake can improve early growth but delays starter intake, creating important management tradeoffs.

The NASEM model also improves how we estimate energy and protein requirements, incorporating maintenance needs, environmental effects, and changes in protein supply as the rumen develops. However, the model represents a “snapshot in time,” and real-world calf growth depends on feeding programs over time as well as management factors such as health and environment. Using dynamic models and practical experience, producers can design feeding programs that meet growth goals efficiently. Ultimately, successful calf nutrition depends not just on meeting requirements, but on applying them within a well-managed system to support optimal growth and long-term performance.