Which one of these nutrients directly supports feather development in birds?

Vitamins play a crucial role in supporting feather development in birds. Specifically, certain vitamins are essential for the synthesis of keratin, which is the primary protein that makes up feathers. For instance, vitamins A and E are vital for the health of feathers, promoting proper growth and maintenance. Vitamin A, in particular, is important for skin health and the formation of feathers, while vitamin E acts as an antioxidant, helping to maintain feather quality and condition.

In the context of poultry, a balanced diet that includes adequate vitamins will help ensure that birds develop robust and healthy feathers, which are essential for insulation, waterproofing, and overall bird health. The other nutrients like fats, minerals, and carbohydrates, while important for various overall health functions, do not specifically target feather development as vitamins do. Therefore, the emphasis on vitamins is particularly relevant in this scenario.