What causes double-yolk eggs in young brown layer flocks at the start of lay?

A double-yolk egg occurs when two mature follicles are released from the ovary within a short timeframe (usually less than 3 hours) or when one yolk is delayed in the body cavity and captured by the infundibulum along with the next ovulation. Both yolks then travel down the oviduct together, receiving layers of albumen, shell membranes, and a single large calcium carbonate shell. This hormonal hyperactivity is highly common in young pullets starting their laying cycle, as their endocrine system is still adapting to light stimulation. These giant eggs are popular in retail but present a risk of oviduct prolapse to the young hen, and are physically impossible to hatch in commercial incubators. Farmers can browse management guides in the Poultry Encyclopedia, source prolapse-preventing feeds on Poultry Plaza, check daily prices on Poultry Rates, and trade on Murghi Mandi.