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The growth habits and intensive feeding of laying hens lead to heat stress in the high temperature environment in summer, resulting in a decrease in the egg production of laying hens. Therefore, when the high temperature weather in summer comes, it is necessary to strengthen the management of laying

Animals need energy to maintain life, grow and develop. The metabolic activities of various nutrients in the feed in the animal body are completed with the participation of energy. Animals get their energy from carbohydrates, fats and proteins in their feed. Layer hens are no exception. However, in

Heat stress in laying hens refers to a symptom in which the body temperature of chickens rises rapidly due to the high temperature of the living environment of the chickens, which affects the physiological functions and metabolism of laying hens. Laying hens mainly regulate the temperature of the ch

Tryptophan, also known as β-indolylalanine, is an organic compound with the chemical formula C11H12N2O2, and is one of the essential amino acids for humans and animals.Tryptophan is an important precursor of auxin biosynthesis in plants. Its structure is similar to IAA. It is ubiquitous in higher pl