When is the transition from starter to grower, and grower to developer feeds triggered in replacement brown pullets?

The transition between dietary phases in rearing brown pullets must be guided by skeletal development and body weight, not just chronological age. The transition from high-protein Starter feed to Grower feed should occur at 5 to 6 weeks of age, once the pullet has reached a body weight of approximately 450 grams and achieved 80% of her frame size. The transition from Grower to Developer feed occurs at 10 to 12 weeks of age (target weight around 950-1000 grams), focusing on developing digestive capacity and fat reserves. Transitioning too early in underweight flocks will stunt skeletal development, leading to poor eggshell quality in lay. Nutritional guidelines are in the Poultry Encyclopedia, premium feed formulations and growth promoters are sold on Poultry Plaza, grain price updates are on Poultry Rates, and high-uniformity pullet flocks are listed on Murghi Mandi.