Protein Source Comparison Study

Study Overview

Understanding the impact of milk replacer formulations is key to optimizing calf growth, feed efficiency, and economic returns. Milk proteins like casein and whey are highly digestible and provide an ideal amino acid profile for pre-weaned calves, supporting efficient nutrient absorption and growth. In contrast, wheat protein is less effective due to lower digestibility, and the presence of anti-nutritional factors. However, it is often considered in formulations due to its lower cost.

This trial compared an All Milk Protein milk replacer to one containing 5% hydrolyzed wheat proteins, assessing their effects on weight gain and feed efficiency to determine the impact of partial plant protein inclusion on calf development and performance.

When comparing the All Milk Protein milk replacer to the Wheat Protein milk replacer, the calves fed the milk protein formula gained more and had greater feed efficiency than those fed the wheat protein formula. Young calves may have experienced greater digestibility utilizing all milk proteins as their gut may not be developed enough to digest non-milk proteins.

Key Takeaways

Weight Gain: Calves fed the All Milk Protein milk replacer achieved 10% more weight gain compared to those fed the Wheat Protein milk replacer, resulting in a 14 lb gain advantage over 79 days.

Average Daily Gain (ADG): The All Milk Protein formula increased ADG by 0.19 lb/day at weaning, supporting faster growth.

Feed Efficiency: Improved feed efficiency was observed with the All Milk Protein milk replacer, requiring less grain per pound of gain after weaning.