Research Progress on Calcium and Phosphorus Dynamic Nutritional Needs of Laying Hens in Breeding Period
Calcium and phosphorus are essential macronutrients for the normal life activities of laying hens and play a crucial role in a variety of physiological processes in the body.With the intensive development of live-stock and poultry farming,the increasing use of calcium and phosphorus has led to waste of resources,in-creased feed costs and environmental pollution.This paper reviews the physiological functions,requirements and dynamic nutritional needs of calcium and phosphorus and their influencing factors,with the aim of provi-ding a theoretical basis for further research on the nutritional needs model of laying hens and the precise supply of calcium and phosphorus in feeds.[Chinese Journal of Animal Nutrition,2024,36(1):40-54]