In terms of animal growth, what does the term "development" specifically refer to?

The term "development" in the context of animal growth refers specifically to the improvement in muscle mass and body composition. This concept encompasses the physiological changes that occur in an animal as it matures, involving the transformation and differentiation of tissues beyond just size increase.

While "increase in overall feed consumption" can contribute to growth, it does not directly define development, as it focuses more on nutrition than the physical changes within the animal’s body.

The idea of "change in breed characteristics over time" relates more to genetic or evolutionary changes rather than individual growth or development during an animal's life cycle.

"Height increase due to environmental factors" addresses growth influenced by external conditions but does not encapsulate the overall improvements in tissue structure and quality that characterize development.

Thus, development is best understood through the lens of enhancements in muscle and body composition, marking progression toward maturity and readiness for production or reproduction.