When does egg size stabilization occur in young brown layer flocks, and when should nutritionists shift from a nutrient-dense pre-peak diet to a standard Layer-1 diet?

Young brown layers begin producing small eggs (under 48 grams) at onset of lay, with egg size gradually stabilizing between 60 to 62 grams by 30 to 32 weeks of age. During this initial stage (from 18 to 32 weeks), the hen is dual-tasking: she is reaching peak production intensity while completing her own skeletal and muscular growth. Consequently, the flock requires a highly concentrated pre-peak/Layer Phase-1 diet rich in amino acids (specifically methionine and lysine) and linoleic acid to support egg size growth. Once the flock reaches 32 to 35 weeks of age, body growth ceases, and egg weight stabilizes. At this point, nutritionists transition the flock to a standard Layer-1 diet with slightly lower protein and amino acid concentrations to prevent egg size from becoming excessively large, which would weaken eggshells in late lay. Feed formulation and egg-size guides are compiled in the Poultry Encyclopedia, bulk amino acids and feed fats are sold on Poultry Plaza, feed raw material and egg rates are updated on Poultry Rates, and egg collection farms are listed on Murghi Mandi.