Feeding Hens and Roosters Together: What You Need to Know

May 9, 2026 Kourtney Dubay

If you keep a mixed flock, you've probably wondered whether your rooster can eat the same feed as your laying hens — and whether it's causing him any harm. The short answer: it's complicated, but manageable. Here's what every backyard flock keeper should know.

The Core Problem: Calcium

Laying hens need significantly more calcium than roosters — typically 3–4g per day to support strong eggshells. Layer feed is formulated with this in mind, containing around 3.5–4% calcium. For a rooster, that's way too much. Over time, excess calcium can lead to kidney damage and gout in males.

Your Options

Option 1: Feed a Grower or All-Flock Feed (Most Popular)

Switch everyone to a lower-calcium grower feed and offer oyster shell free-choice on the side. Hens will self-regulate and eat the oyster shell as needed; roosters will largely ignore it. This is the approach most backyard keepers prefer for its simplicity.

We carry Luxemburg's 19% Non-GMO, No Corn - No Soy Grower Mash — locally milled right here in Minnesota, it's our top recommendation for mixed flocks. At around 19% protein and lower calcium than layer feed, it supports both your hens and your rooster without the calcium overload.

Option 2: Separate Feeding

Keep hens on layer feed and separate the rooster during feeding times. This works but requires daily management and isn't practical for most setups.

Option 3: Feed Layer Feed Short-Term

If your rooster is young and healthy and you only have a few birds, short-term layer feed exposure is unlikely to cause immediate harm — but it's not a long-term solution.

A Note From the Vet

While free-choice oyster shell works well for most backyard flocks, it isn't a perfect solution for every situation. Some vets and poultry nutritionists point out that:

High-production breeds (Leghorns, ISA Browns) that lay nearly every day have calcium demands so high that free-choice supplementation may not keep up
Oyster shell dissolves quickly and may not provide enough slow-release calcium overnight — which matters because eggshells actually form during the dark cycle
Older hens have reduced calcium absorption efficiency and may need more dietary calcium than a pullet even eating the same amount of oyster shell
Stress, illness, and summer heat can reduce calcium uptake, meaning a molting or heat-stressed hen may not eat enough oyster shell to compensate

If you're seeing thin-shelled eggs, soft eggs, or a drop in production, it may be worth switching to a layer feed for your hens while still protecting your rooster with a separate or timed feeding schedule. When in doubt, consult your poultry vet — they can assess your specific flock's needs.

Our Layer Feed Lineup

If you decide layer feed is the right choice for your hens, we carry a full range of locally milled options:

What About the Rooster's Other Nutritional Needs?

Roosters are active and can be hard on their bodies — especially if they're mating frequently. A quality grower or all-flock feed with 18–20% protein supports muscle maintenance and energy. You can also supplement with Poultry Power Supplement or Healthy Coat Kickin Chicken for added omega fatty acids and coat condition.

Our Recommendation

At Bloomington Farm & Feed, we recommend Luxemburg's 19% Grower Mash + free-choice oyster shell as the simplest, healthiest starting point for most mixed flocks. But every flock is different — if your hens are high-production, older, or showing signs of calcium deficiency, a layer feed base may serve them better. Stop by or order online — all of our feeds are sourced from local Minnesota mill partners.

Quick Tips

Always offer grit free-choice alongside feed
Monitor your rooster's weight and activity — early signs of kidney issues include lethargy and reduced appetite
Thin or soft shells? Try adding oyster shell even if you're already on layer feed
If you're unsure which feed is right for your flock, reach out to us — we're happy to help

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