# Emu Egg: Size, Incubation, and Nutrition Facts

An emu egg is a large, dark green, thick-shelled egg that typically weighs 450 to 650 g and needs roughly 56 days of artificial incubation at 36.1 to 36.7 C (97 to 98 F) with 40 to 50 percent humidity and turning 4 to 6 times daily. Per 100 g of edible content, an emu egg supplies protein at levels broadly similar to a chicken egg, but with more fat and more cholesterol.

This article covers the three things keepers and veterinarians are asked about most: how big emu eggs are and why size matters, how to incubate them successfully, and how their composition compares with chicken and ostrich eggs. The comparison table below puts the headline numbers side by side.

## Quick Comparison: Emu, Chicken, and Ostrich Eggs

<figure class="article-figure">
  <img src="https://upload.wikimedia.org/wikipedia/commons/1/19/Comparison_of_eggs_by_Zureks.jpg" alt="Emu egg beside ostrich, kiwi, and chicken eggs for size comparison" loading="lazy" decoding="async" width="1000" height="988" />
  <figcaption>Comparing the emu egg with ostrich, kiwi, and chicken eggs shows where it falls in the size range. Image: Zureks, CC BY-SA 3.0, via <a href="https://commons.wikimedia.org/wiki/File:Comparison_of_eggs_by_Zureks.jpg" rel="noopener noreferrer">Wikimedia Commons</a>.</figcaption>
</figure>

| Species | Typical egg weight | Incubation period | Incubation temperature | Incubation humidity |
|--|--|--|--|--|
| Emu | 450 to 650 g | About 56 days | 36.1 to 36.7 C (97 to 98 F) | 40 to 50 percent, raised late in incubation |
| Chicken | About 55 to 65 g | About 21 days | 37.5 C (99.5 F) | About 45 to 55 percent, raised at hatch |
| Ostrich | About 1,300 to 1,700 g | About 42 days | 36.5 to 37.0 C (97.7 to 98.6 F) | About 25 to 30 percent in published protocols |

The ostrich temperature and humidity figures come from a controlled hatchability study in which eggs were incubated at 36.5 to 37.0 C and 25 percent relative humidity through day 38, then at 36 C and 30 percent relative humidity thereafter [1]. A separate ostrich study concluded that incubator humidity should be kept low because ostrich eggshells lose water slowly, and that high humidity contributes to poor hatchability under artificial incubation [2]. That finding is specific to ostrich eggs and should not be copied onto emu eggs, whose shells and water-loss behavior differ.

## How Big Is an Emu Egg?

An emu egg weighs 450 to 650 g. That is roughly eight to ten times the mass of a typical chicken egg and about one third the mass of an ostrich egg. The shell is dark green, sometimes described as emerald or almost black, with a surface that looks slightly pebbled or matte rather than glossy. The color comes from biliverdin and related pigments deposited in the outer shell layers, and it fades toward a paler green as the egg ages or is exposed to light.

The shell is thick. This is the single most important physical fact for anyone handling or incubating emu eggs. Thickness affects three practical things:

- **Candling.** A bright, focused candler is needed to see the air cell and early blood vessels. In the first week, a dark green shell can hide development that would be obvious in a chicken egg.
- **Water loss.** A thick shell with low pore density restricts the rate at which water vapor escapes. This is why humidity management in the second half of incubation is the most common point of failure.
- **Hatch timing.** The internal pip (the chick breaking into the air cell) and the external pip (breaking the shell) can be separated by a long interval in thick-shelled eggs, which tempts keepers to intervene too early.

Egg size also affects incubation logistics. A 450 g egg and a 650 g egg do not lose water at the same rate, and they do not fit the same turning cradle. Weigh the eggs before setting them and record the weights, because tracking mass loss is the most reliable way to know whether humidity is correct.

## Incubation Parameters for Emu Eggs

### Temperature

Set the incubator at 36.1 to 36.7 C (97 to 98 F). This is slightly cooler than the standard chicken setting of 37.5 C (99.5 F). Ratites in general are incubated at lower temperatures than galliforms, and the ostrich literature reflects this, with published protocols using 36.5 to 37.0 C for the first 38 days and 36 C afterward [1]. Follow the emu-specific range rather than borrowing a chicken protocol.

Use a calibrated thermometer at egg level, not the incubator's built-in display. A one-degree error over 56 days is a large cumulative insult.

### Humidity

Target 40 to 50 percent relative humidity for the bulk of incubation. The critical adjustment is late in incubation, when humidity should be raised. The reason is water loss. An egg must lose a defined fraction of its starting mass over incubation for the air cell to reach the correct size at internal pip. If humidity is too high throughout, the egg loses too little water, the air cell stays small, and the chick can drown or fail to orient for pipping. If humidity is too low, the egg loses too much water and the chick becomes dehydrated and stuck.

The ostrich data show how strongly shell properties drive this. In one study, eggshell thickness correlated negatively with mass loss (r = -0.65), meaning thicker shells lost less water, and eggs with low shell thickness lost 13.03 percent of their mass compared with 10.36 percent for high-thickness eggs [2]. The same study found that hatchability was 50 percent lower in eggs with low pore density (40.93 percent) than in eggs with high pore density (80.94 percent), and pore density correlated positively with mass loss (r = 0.63) [2]. Those numbers are from ostrich eggs, but the underlying principle, that shell structure governs water loss and water loss governs hatchability, applies to thick-shelled ratite eggs generally.

For emu eggs, the practical approach is:

- Weigh eggs at set and every 7 days.
- Aim for steady, gradual mass loss rather than a single target number copied from another species.
- Increase humidity in the final week to soften the shell membrane and support hatching.
- Ventilate adequately. High humidity plus poor ventilation is worse than either problem alone.

### Turning

Turn emu eggs 4 to 6 times daily. Automatic turners set to a slow rock are ideal because the eggs are heavy and the air cell should not be jostled. Stop turning at internal pip, usually around day 52 to 54, and leave the egg in position for hatching. Mark the egg with a pencil at set so you can confirm that turning is actually happening and that the egg is not stuck against a wall of the turner.

### Duration and Hatch Window

Expect about 56 days. Do not panic if an egg goes to day 58 or 59. Hatch windows in ratites are wide, and thick shells slow the process. The ostrich literature documents that incubation period lengthens with longer pre-set storage, with eggs stored more than 15 days taking longer to hatch than eggs stored 15 days or fewer [1]. If you must store emu eggs before setting, keep storage short.

## Why Emu Eggs Are Hard to Candle

Candling an emu egg is not like candling a chicken egg. The shell is thick and dark green, so the light that reaches the interior is dim and green-tinted. Early in incubation, you may see nothing at all even in a fertile egg. This is normal and is not a reason to discard the egg.

Practical candling tips:

1. Use a high-output candler, ideally one designed for ratite eggs, in a fully dark room.
2. Candle at day 7 to 10 to look for an air cell and, if visible, a faint vascular web.
3. Candle again around day 20 to 30, when the embryo is large enough to cast a shadow.
4. Judge the air cell more than the embryo. Air cell size and shape tell you about water loss, which is the variable you can actually control.
5. Do not candle daily. Each handling risks cracks and temperature drops.

If you cannot see development at day 10, wait. Recheck at day 14 before making any decision. A dark, opaque interior with a clearly defined air cell is a reasonable sign of life in an emu egg.

## Nutrition: Emu Egg Composition Compared With Chicken and Ostrich

Per 100 g of edible egg content, an emu egg has protein at levels broadly similar to a chicken egg, with higher fat and higher cholesterol. The higher fat content is the main reason emu eggs are prized in cooking for their richness and their large, deep-orange yolks.

The yolk is where the fat and cholesterol sit. Yolk proportion in ratite eggs tends to be high relative to total egg mass, which concentrates those nutrients further when you compare whole-egg content. This is also why an emu egg behaves differently in baking and in a hot pan: more fat, more yolk, more color.

### What the Fatty Acid Data Show

A detailed food composition study measured arachidonic acid (20:4 n-6) in common foods on a 100 g edible basis and reported 891 mg for duck egg yolk and 390 mg for chicken egg yolk [3]. The same study found eicosapentaenoic acid (20:5 n-3) levels below 10 mg per 100 g in chicken meat, turkey meat, emu meat, and chicken eggs [3]. Two points follow from this. First, egg yolk is a concentrated source of long-chain arachidonic acid relative to most meats. Second, emu meat is low in EPA, and by extension the egg is not a meaningful source of that particular omega-3 fatty acid. Anyone expecting an emu egg to be an omega-3 powerhouse should adjust that expectation.

### Nutrient Density and Practical Kitchen Notes

An emu egg is a large single unit of food. One egg can weigh 450 to 650 g, so a single emu egg is roughly equivalent to eight to ten chicken eggs in total mass. That matters for anyone portioning it. It also matters for anyone cooking with it, because the yolk-to-white ratio and the fat content change the texture of custards, omelets, and baked goods.

Storage and handling follow the same principles as other eggs. Keep eggs cool and clean, discard cracked eggs, and cook eggs thoroughly. The shell is thick, but thickness is not a barrier to bacterial contamination once the shell is breached.

This article does not provide human dietary recommendations. If you have questions about how emu eggs fit into your own diet, ask a physician or a registered dietitian.

## Practical Care for Keepers

### Before Setting Eggs

- Weigh each egg and write the weight on the shell in pencil.
- Inspect for cracks, even hairline ones. A cracked emu egg will not hatch and will contaminate the incubator.
- Store eggs cool and turn them if storage will exceed a few days. Long storage reduces hatchability, as shown in ostrich eggs stored more than 15 days [1].
- Sanitize the incubator and calibrate the thermometer and hygrometer.

### During Incubation

- Maintain 36.1 to 36.7 C (97 to 98 F).
- Maintain 40 to 50 percent humidity, then raise it late.
- Turn 4 to 6 times daily until internal pip.
- Weigh weekly and record mass loss.
- Keep a written log. Over 56 days, memory is not reliable.

### At Hatch

- Stop turning at internal pip.
- Raise humidity and leave the egg alone.
- Resist assisting unless a qualified person advises it. Premature assistance in thick-shelled eggs frequently kills chicks that would have hatched.
- Provide a dry, warm, draft-free brooder after the chick is fully dry.

### Health Monitoring

Emu chicks are precocial, meaning they are mobile and feeding soon after hatch, but they are not hardy in the way a chicken chick is. Watch for lethargy, reluctance to stand, and abnormal droppings, and contact a veterinarian promptly if any appear. According to the AVMA, all animals, including backyard poultry and ratites, benefit from veterinary oversight, and a veterinarian familiar with ratites should be your first contact for any health concern.

## Common Myths and Questions About Emu Eggs

**Myth: Emu eggs are just big chicken eggs.** They are not. The shell is much thicker, the color is dark green, the incubation is nearly three times as long, and the temperature and humidity requirements are different.

**Myth: You can candle an emu egg the same way as a chicken egg.** You cannot see development as early or as clearly. Air cell tracking is more useful than embryo tracking.

**Myth: Higher humidity is always safer.** Too much humidity prevents adequate water loss and can drown a chick. The ostrich data show that low humidity is used in published ratite protocols precisely because these shells lose water slowly [2].

**Myth: An emu egg is a low-cholesterol food.** It is higher in fat and cholesterol per 100 g than a chicken egg.

**Myth: Any incubator will do.** A standard chicken incubator set to 37.5 C will run too warm, and its turner may not accommodate a 650 g egg.

## What Is Still Uncertain

Emu-specific incubation research is thin compared with chicken and ostrich research. Much of what keepers apply comes from ostrich studies and from practical experience, and the two do not always transfer cleanly because shell thickness, pore density, and water vapor conductance differ between species. The ostrich conductance values reported in the literature (mean eggshell water vapor conductance of 87.77 mg H2O per day per Torr) are specific to that species and should not be assumed for emu eggs [2].

The exact optimal humidity curve for emu eggs, meaning the ideal humidity at each week rather than a single range, is not well established in the published literature. The 40 to 50 percent range with a late increase is a reasonable working protocol, and weekly egg weights are the best available feedback signal.

Nutritional composition data for emu eggs are also less complete than for chicken eggs. The fatty acid data available cover specific fatty acids rather than a full nutrient panel, so statements about total fat and cholesterol rest on the general pattern that ratite eggs are richer in yolk solids than chicken eggs.

## Limitations and When to Contact a Veterinarian

This article is educational and is not a substitute for veterinary diagnosis or treatment. Individual eggs, individual birds, and individual flocks vary, and a veterinarian who can examine the bird or the egg in person is the right resource for any specific problem.

Contact a veterinarian promptly if any of the following occur:

- A chick fails to hatch by day 60 with no internal pip.
- A chick pips internally but shows no progress for more than 24 hours.
- A hatched chick is lethargic, unable to stand, or not eating within the first day.
- An adult emu shows weight loss, abnormal droppings, labored breathing, or a sudden drop in egg production.
- Any egg in the incubator smells foul or weeps fluid. Remove it immediately and disinfect the incubator.

For flock-level concerns, your state veterinarian or a poultry extension veterinarian can provide guidance on reportable diseases and biosecurity.

## Frequently Asked Questions

### How much does an emu egg weigh?

An emu egg typically weighs 450 to 650 g, roughly eight to ten times a chicken egg.

### How long does it take to incubate an emu egg?

About 56 days, though a hatch window extending to day 58 or 59 is normal.

### What temperature and humidity should an emu egg be incubated at?

36.1 to 36.7 C (97 to 98 F) at 40 to 50 percent humidity, with humidity raised late in incubation.

### How many times a day should emu eggs be turned?

Four to six times daily until internal pip, then stop turning.

### Why can't I see anything when I candle an emu egg?

The shell is thick and dark green, so early development is often invisible. Track the air cell instead.

### Are emu eggs higher in cholesterol than chicken eggs?

Yes. Per 100 g, emu egg content is higher in fat and cholesterol than chicken egg, with protein at broadly similar levels.

### How does an emu egg compare with an ostrich egg?

An emu egg weighs 450 to 650 g and incubates about 56 days, while an ostrich egg weighs roughly 1,300 to 1,700 g and incubates about 42 days.

### Do emu eggs need higher humidity at the end of incubation?

Yes. Humidity should be raised late in incubation to support the final stages before hatching.

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## Further Reading

- [Seasonal changes in plasma levels of sex hormones in the greater Rhea (Rhea americana), a South American Ratite with a complex mating system.](https://pubmed.ncbi.nlm.nih.gov/24837464/)
- [Serum prolactin and testosterone levels in captive and wild brown kiwi (Apteryx mantelli) during the prebreeding, breeding, and incubation periods.](https://pubmed.ncbi.nlm.nih.gov/30937977/)
- [Supplementation of different concentrations of Orvus Es Paste (OEP) to ostrich egg yolk lipoprotein extender improves post-thaw boar semen quality.](https://pubmed.ncbi.nlm.nih.gov/24988847/)

## Sources

1. [Egg storage period and weight effects on hatchability of ostrich (Struthio camelus) eggs.](https://pubmed.ncbi.nlm.nih.gov/16479949/)
2. [Effects of some egg characteristics on the mass loss and hatchability of ostrich (Struthio camelus) eggs.](https://pubmed.ncbi.nlm.nih.gov/12964621/)
3. [The arachidonic acid content of the Australian diet is lower than previously estimated.](https://pubmed.ncbi.nlm.nih.gov/7562087/)