When the Switch Happens
Layer feed begins at the point of lay, not at a birthday plucked from a calendar. For most common laying breeds that lands around eighteen weeks of age, but the reliable signals are physical: combs and wattles reddening and enlarging, pullets crouching when a hand passes over their backs, interest in the nest boxes, and finally the first small eggs. Start the changeover as those signs gather, or when the first egg arrives from the earliest bird in the flock, whichever comes first. A pullet still weeks from laying gains nothing from layer feed, and a hen already laying on grower feed is drawing shell calcium from her own bones, so the window matters in both directions.
How to Change Feeds Without Upsetting the Flock
Hens are creatures of habit and suspicious of a feeder that suddenly looks and tastes different. Blend the change over roughly a week: begin with a small share of layer feed mixed through the familiar grower ration, raise the layer share every couple of days, and finish the week on straight layer feed. Pellets, crumbles, and mash are all acceptable forms; match the form to what your flock already eats to make the swap invisible, and keep the feeder filled so no bird has to compete for the new mix. Fresh water matters more than ever during the change, since calcium metabolism and shell formation both depend on the hen drinking well.
What Layer Feed Does That Grower Feed Does Not
The headline difference is calcium. A laying hen exporting a shell nearly every day needs several times the calcium of a growing pullet, and layer feed is formulated with that load built in, alongside protein levels set to sustain laying rather than growth. That is precisely why timing is a health issue and not a formality: a young bird fed layer feed for months before she lays cannot shed the surplus calcium comfortably, and her kidneys pay for the excess. For the same reason, layer feed is not the right ration for roosters or retired hens kept long-term, who are better served by a general poultry feed with calcium offered separately to whoever is actually laying.
The Pullets Who Are Not Laying Yet
Mixed-age flocks complicate the switch, because the first pullet to lay may beat her hatch-mates by a fortnight. If part of the flock is laying and part is not, a sound compromise is a grower or all-flock feed for everyone, with oyster shell in a separate dish that laying hens help themselves to and youngsters mostly ignore. Begin the full move to layer feed when the majority are laying, and do not be alarmed by the first eggs themselves: early eggs are often small, occasionally shell-less or double-yolked, and settle into a normal pattern as the hen's system matures. Shortening daylight can also delay maturity, so autumn-hatched pullets may simply be on a slower clock.
Signs the Timing Was Off
The eggs report on the ration. Repeated thin or soft shells in hens already on layer feed suggest calcium is not being taken in or absorbed, worth checking against how much low-calcium scratch and scraps is displacing the feed. Blooms of very rough, calcium-coated shells can point the other way. A hen straining in the nest, penguin-postured, or suddenly lethargic may be struggling to pass an egg, and that is a same-day veterinary call rather than a feeding adjustment. Setting the flock's feed changeover, shell dish refills, and egg notes as shared duties in KinsLe's Care Teams means the switch happens on schedule and shell changes are spotted by whoever collects the eggs.