Feeding the wrong type at the wrong age is one of the most common, and most avoidable, mistakes new keepers make. It's not just about cost, it can genuinely affect growth and health. Here's the difference between the three main feed types and when to switch.
| Feed type | Age range | Protein % | Calcium added | Purpose |
|---|---|---|---|---|
| Starter | Hatch to 8 weeks | 18-20% | No | Rapid early growth |
| Grower | 8 to 18-20 weeks | 16-18% | No | Steady development before laying |
| Layer | 18-20 weeks and laying | 16-18% | Yes (about 4%) | Support egg production and shell strength |
| Broiler grower | Hatch to market weight | 20-22% | No | Fast weight gain for meat birds |
Starter feed: hatch to 8 weeks
Starter feed is formulated for chicks in their fastest growth phase and runs higher in protein, typically 18 to 20%, than what an adult bird needs. It often comes medicated (to help prevent coccidiosis) or unmedicated, depending on whether your chicks were vaccinated. Chicks eat far less than adult birds, roughly a tenth of a pound a day, scaling up as they grow.
Grower feed: 8 to 18-20 weeks
Once chicks are past the fastest growth phase, grower feed carries them through adolescence with slightly lower protein than starter, still without the added calcium that layer feed has. Feeding grower too long isn't harmful, it's mainly a matter of matching nutrition to what the bird needs at each stage.
Layer feed: from first egg onward
Layer feed is formulated for hens that have started laying, with added calcium to support eggshell strength. This is the feed type our feed cost calculator uses as its default, since most backyard flocks are laying hens. Feeding layer feed to chicks or non-laying pullets isn't recommended, the excess calcium can be hard on their kidneys before they actually need it.
What about broilers?
Meat birds (broilers) are typically fed a higher-protein grower-style ration throughout their shorter life span, since they're bred to put on weight quickly rather than to lay eggs. They eat noticeably more per day than layers, roughly a third of a pound versus a quarter-pound, which is reflected in the calculator's broiler mode.
Reading the signs of a feeding mistake
Your flock will often tell you if the feed type is wrong before you notice it yourself. Soft, thin, or misshapen eggshells usually point to insufficient calcium, meaning layer feed was introduced too late or isn't being eaten enough relative to treats and scraps. Slow growth, patchy feathering, or lethargy in young birds often points to protein that's too low for their current age. If you're ever unsure which stage a bird is at, especially with a mixed-age flock, it's safer to underfeed layer feed than overfeed it to non-laying birds.
The simple rule
Starter for chicks, grower from about 8 weeks, layer once they're actually laying eggs. Getting the timing right isn't complicated, it just requires knowing your flock's age and adjusting the bag you buy accordingly.