육계에서의 칼슘 및 인 영양의 최신 연구 동향

초록

Calcium (Ca) and phosphorus (P) are essential for skeletal integrity and bird growth. In plant-based broiler diets, Ca and P are supplied by adding inorganic sources. Precision feed formulation involves accurately meeting the broiler requirements, and to achieve this, evaluating the availability of Ca and P in feed ingredients is necessary. Since Ca and P are deeply related to intestinal absorption and utilization, evaluating the Ca or P availability in feed ingredients requires an understanding of the metabolism of these two nutrients. Moreover, the concentrations and ratios of Ca and P in diets must be considered. Currently, broiler diets are formulated based on total Ca and available P contents, and generally, phytate P is used as available P. When formulating feed based on total nutrients content, there is a risk of oversupplying Ca or P, which is beyond the requirement. Therefore, it is imperative to accurately provide the available amounts of Ca and P to meet the requirements of broilers. Recent studies evaluating the digestibility of Ca or P in feed ingredients have led to the proposal of using digestible Ca and P as terms for available Ca and P. Digestibility can be measured by using total tract retention and ileal digestibility. However, specific standardized protocols have not been established, resulting in inconsistent digestibility values across experiments. Furthermore, with the constant genetic evolution of breeder companies, recommended requirements must be adjusted to enhance nutrient utilization and improve growth performance. This study discusses recent trends in Ca and P research in broilers, focusing on evaluating the digestibility of Ca and P in feed ingredients and measuring Ca and P requirements in poultry.

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