Best Chick Starter Feed 2026: Medicated vs Non-Medicated, Compared

Quick Answer: The best chick starter feed for most backyard flocks in 2026 is Purina Start & Grow, an 18% protein crumble with 0.75-1.25% calcium that you feed from day one until the first egg. Choose the medicated version (amprolium 0.0125%, the top of the FDA’s approved starter range) if your chicks were not vaccinated for coccidiosis, and the non-medicated version if they were, because Merck’s own Coccivac-B52 label says the vaccine is not ordinarily recommended with starter feeds that contain coccidiostats. For organic chicks or a brooder that mixes layers with meat birds, Kalmbach 20% Organic Chick and Meatbird Starter Grower is the pick.

Starter feed is the one purchase that has to be right on day one. Chicks grow faster in their first eight weeks than at any other point in their lives, coccidiosis (the leading killer of young chicks) strikes in exactly that window, and the bag you choose decides both. The confusing part is that every major brand sells the same feed twice, once medicated and once not, and the right answer depends on a question most first-time keepers don’t know to ask: were the chicks vaccinated? We compared the leading chick starter feeds of 2026 on protein, calcium, medication, age range and price per pound, and laid out the medicated-versus-non-medicated decision in one table.

Our top picks at a glance

Chick starter feed by the numbers

• 0.0125% is the standard dose, and the FDA lists it twice. Under 21 CFR 558.55, amprolium at 113.5 g/ton (0.0125%) appears both in the “replacement chickens: for development of active immunity to coccidiosis” table (the maximum for chicks under 5 weeks facing severe exposure) and at the bottom of the 0.0125-0.025% range approved for prevention “where immunity to coccidiosis is not desired.” Medicated starter at this level suppresses the parasite; it does not stop chicks from ever building immunity.
• Layer feed damages young kidneys. In Wideman and Cowen’s 1987 Poultry Science study (PMID 3039478), chicks fed a commercial layer ration at 3.25% calcium developed a 60% incidence of kidney lesions and lost 25% of their filtering nephrons, compared with chicks on a 1% calcium grower ration. Every starter on this list sits near 1% calcium.
• A layer chick eats about 20 pounds before she lays. Gail Damerow, writing for Cackle Hatchery, puts it at 20 pounds of feed in the first 20 weeks for a layer chick, versus 10 pounds in the first 6 weeks for a Cornish Cross broiler. Six layer chicks therefore need about 120 pounds of starter/grower, or two and a half 50-pound bags.
• 18% protein is the floor for layer chicks. Purina’s guaranteed analysis for Start & Grow Medicated lists 18.00% minimum crude protein, 0.75-1.25% calcium and 0.0125% maximum amprolium, and Purina’s product page states that amprolium is not an antibiotic and is not affected by the Veterinary Feed Directive.

Medicated or non-medicated: the decision in one table

The single most useful thing you can do is ask the hatchery or feed store which vaccine the chicks got, because “vaccinated” usually means Marek’s. The Marek’s vaccine protects against a herpesvirus, and amprolium only acts on the coccidia parasite, so Marek’s-only chicks still belong on medicated starter. The coccidiosis vaccine is a separate option that not every hatchery sells. Meyer Hatchery, for example, offers it on Cornish Cross as a spray applied on hatch day (it contains a dye, so chicks can arrive slightly tinted) and warns that medicated chick starter or any amprolium “will negate the vaccine.” My Pet Chicken doesn’t offer a coccidiosis vaccine at all. Check your order confirmation if you can’t remember what you paid for.

1. Purina Start & Grow — Best Overall Chick Starter Feed

Feed is heavy, and running out on day four of brooding means a trip you didn’t plan. Try Amazon Prime free for 30 days and smaller restocks like a backup bag of starter, chick grit or waterer parts can arrive in two days instead of waiting for your next feed-store run.

Purina Start & Grow is the starter most feed stores keep on the shelf, and it earns the top spot because it does the boring things exactly right. The guaranteed analysis is 18% minimum protein, 3% minimum fat, 5% maximum fiber and 0.75-1.25% calcium, and the feeding directions are simple: feed it as the only ration from day one until the first egg (usually 18-20 weeks), then switch to layer feed. That single-bag-to-laying-age design means you never have to time a starter-to-grower switch. The medicated version carries 0.0125% amprolium, the top of the FDA’s range for chicks under five weeks, and Purina recommends it for any chick that wasn’t vaccinated or whose status you don’t know. The honest catch is price consistency: a 50-pound bag of the medicated version was $26.49 at Tractor Supply when we checked (marked down from $28.49), while Walmart listed the 25-pound bag at $36.79-$39.99, so the small bag can cost nearly three times as much per pound. Buy the 50-pound bag if you have more than four chicks.

2. Nutrena NatureWise Chick Starter Grower — Best Value

Nutrena NatureWise is the starter to buy when price per pound matters more than brand. At $17.49 for 40 pounds (Farm & Fleet), it works out to about 44 cents a pound, the cheapest feed on this list, and the nutrition is close to Purina’s: 18% protein, with a slightly higher listed methionine (0.36% versus Purina’s 0.30-0.34%), the amino acid chicks need most for feathering. Like Purina, it comes in medicated and non-medicated versions, so it handles both sides of the vaccine question. The one thing to watch is the age range: Tractor Supply’s listing says the medicated version is for chickens from hatch to 22 weeks, while North40 says hatch to 16 weeks. Go by the tag on the bag you buy, and switch to layer feed at the first egg either way.

3. Kalmbach 20% Organic Chick and Meatbird Starter Grower — Best Organic, Best for Mixed Brooders

If you want organic, or your brooder holds layer chicks and Cornish Cross side by side, Kalmbach’s 20% Organic Starter Grower is the one bag that fits both. Meat birds eat roughly ten pounds of feed in six weeks (per Damerow) and need more protein than layer chicks, and the 20% minimum here covers them without forcing layer chicks onto a broiler ration. Calcium sits at 0.80-1.30%, squarely in the safe starter range. It’s USDA Certified Organic and comes as a crumble rather than a mash, which means less waste than most organic starters. The trade-offs are honest ones. It is non-medicated (the medicated field on Kalmbach’s own product page is blank, and a Chewy answer confirms it), so it’s the right pick for vaccinated chicks or keepers who’d rather manage coccidiosis with clean, dry bedding and Corid on standby. And it costs about twice as much as conventional starter: $28.99 for 35 pounds at Russell Feed and $35.99 at Chewy when we checked, or roughly 83 cents to a dollar a pound.

4. Scratch and Peck Organic Starter Mash — Best Soy- and Corn-Free

Scratch and Peck is the brand keepers name when the ingredient list matters most, and its starter mash is the cleanest on this list: organic, non-GMO, and made without soy or corn, with 20.5% protein, the highest here. It’s labeled for chicks and ducklings, which makes it a natural fit for a mixed waterfowl brooder. Three honest caveats. It is a stage-one feed for the first eight weeks only, so unlike Purina or Nutrena you’ll need a second bag (a grower) before laying age. It’s a mash, which chicks scatter more than crumbles unless you wet or ferment it. And it is expensive: Chewy listed the 25-pound bag at $49.99, or $2.00 a pound, more than four times Nutrena. One Chewy reviewer also reported finding corn kernels in the bags, so treat “corn-free” as a formulation claim rather than an allergen guarantee.

5. Manna Pro Medicated Chick Starter — Best Small Bag

The Manna Pro 5-pound bag is for the keeper starting with two to four chicks from the feed store who doesn’t want a 50-pound sack going stale in the garage. The formula is a straightforward 18% protein medicated crumble at the standard 0.0125% amprolium dose. Be clear about what you’re paying for, though: at $7.49 for 5 pounds it costs about $1.50 a pound, nearly three times Purina’s 50-pound bag. By Damerow’s 20-pounds-per-chick estimate, four layer chicks need about 80 pounds before they lay, so one 5-pound bag gets you through the first few weeks of brooding, not to laying age. Use it to get started, then move up to a big bag once you know how the flock is doing.

Price per pound, compared

Prices checked October 29, 2026 at the retailers named. Feed prices move with grain markets and vary by store, so treat these as a snapshot, not a quote.

The pattern is clear: the bag size matters as much as the brand. The same Purina medicated starter costs roughly three times as much per pound in a 25-pound Walmart bag as in a 50-pound Tractor Supply bag. If you have six or more chicks, the big bag pays for itself in the first month. Store it in a sealed metal can (see our feed storage container picks) so the extra weight doesn’t turn into a rodent buffet.

How much starter feed to buy

Based on Gail Damerow’s averages for Cackle Hatchery: 20 lb per layer chick over 20 weeks, 10 lb per Cornish Cross over 6 weeks. Waste from a poorly set feeder can add a lot on top.

Chicks eat very little in the first two weeks and much more by week eight, so don’t panic if the first bag seems to last forever. Buy the second bag around week six.

Ducklings, goslings and meat birds

Ducklings and goslings. The old warning that medicated chick feed kills ducklings dates from feeds that used other drugs. Metzer Farms cites a 1982 Oregon State study in which ducklings fed amprolium at chicken and turkey levels up to four weeks of age showed no mortality, stunting or leg problems. Metzer still prefers non-medicated feed when the nutrition is otherwise equal, and that’s a sensible default. The more important gap is niacin: Merck’s Veterinary Manual puts the chicken niacin minimum at about 30 mg/kg of feed against 55-70 mg/kg for ducks and geese, so add brewer’s yeast to any chick starter you share with waterfowl. Our guide to raising chickens and ducks together covers the rest.

Meat birds. Cornish Cross grow so fast that an 18% layer starter shortchanges them. A 20%+ feed like the Kalmbach organic starter grower above is the minimum; dedicated broiler starters often run higher.

When to switch from starter to layer feed

Stay on a starter/grower until the first egg, then switch to layer feed. Purina’s feeding directions for Start & Grow say exactly that: feed it continuously as the sole ration from day one until the onset of egg production. Most pullets start laying at 18-20 weeks, though Leghorns can start at 16-18 and dual-purpose breeds can take 20-24 (see when chickens start laying eggs). Switching early is the real mistake, because the 3.25-4% calcium in layer feed is what caused kidney lesions in 60% of the immature birds in the 1987 Poultry Science study above. If you feed a stage-one starter like Scratch and Peck’s, move to a grower at 8 weeks, then to layer feed at the first egg. When you do make the switch, our chicken feed comparison ranks the layer feeds.

How to choose a chick starter feed

• Settle the vaccine question first. Vaccinated chicks get non-medicated feed; everyone else gets medicated. Everything else is secondary.
• Look for 18% protein or more and about 1% calcium. Every starter on this list clears both. Anything labeled “layer” fails the calcium test.
• Pick crumbles for the first weeks. Chicks handle crumbles easily and waste less of them than mash. Commercial crumble is a complete feed, so chicks eating only starter don’t need grit; add chick grit once they get treats or forage.
• Buy the biggest bag you’ll finish within a few months. Feed loses freshness once opened, but the per-pound savings on a 50-pound bag are large.
• Don’t double up on amprolium. Medicated starter is labeled as the sole source of amprolium, and it’s a thiamine blocker, so don’t add vitamin B supplements or Corid on top unless you’re treating an outbreak.
• Set up the brooder before the chicks arrive. Starter only works if chicks can reach it and stay warm; see our brooder picks, chick waterers and heat lamps.

The bottom line

For most backyard chicks, Purina Start & Grow is the starter feed to buy: 18% protein, about 1% calcium, and one bag from day one to the first egg. Get the medicated version (0.0125% amprolium) for unvaccinated or unknown-status chicks and the non-medicated version for vaccinated ones. On a budget, Nutrena NatureWise does the same job for less per pound. For organic chicks or a brooder that mixes layers and meat birds, Kalmbach 20% Organic Starter Grower covers both, and Scratch and Peck is the soy- and corn-free option if you can live with the price. Whatever you choose, keep chicks off layer feed until they lay. Shop chick starter feed on Amazon.