In research, we often talk about biological optimum as the nutrient level that allows animals to achieve their maximum performance. Under controlled conditions, this concept works well. Animals are healthy, environmental variation is limited, and feed intake is relatively predictable. These experiments provide the foundation of modern nutrition and remain essential to our understanding of nutrient requirements.
Commercial production, however, rarely resembles research conditions. Over time, most nutritionists working in broiler or pig production quickly realize that maximum biological performance is not always the most relevant target. In practice, the objective becomes achieving the most reliable and profitable performance under real-world conditions. This distinction lies at the heart of commercial nutrition.
