Nutritional considerations of feeding laying hen under Central America conditions. Egg production is affected by many factors, which include replacement feeding program, environmental conditions, feed intake, nutrient requirements, type of diets and feeding management program. The most critical factor that affects egg production and egg weight is the feeding program during the growing period. The success of a feeding program is to reach the exact body weight at sexual maturity. Every commercial hybrid has its own ideal weight and it is affected by feed intake, nutrient requirements and feeding program. Environmental conditions are other important factors that affect egg production. High or low temperatures affect feed intake, causing a nutrient deficiency or toxicity which affects the performance of the laying hen.