Day old chick weight is proportional to the age of the breeders between 25 and 35 weeks and tends to stabilize progressively thereafter. Additionally, achieving the breeder bodyweight target with regular weekly weight gain during the first 6 - 8 weeks of their life, the subsequent feed management and the correct level of sexual maturity for the breed are the most important criteria that will determine the uniformity of the chicks. This requires good brooding conditions, moderate feed restriction before 6 weeks, black out rearing and sufficient feed equipment.