Storing fertile chicken eggs.

Got your eggs but not able to put them into the incubator yet? 

1.  Keep your nest box clean!

One of the most critical issues for hatching is to avoid contamination with bacteria. By choice a hen will use a quiet, clean place to set her clutch. 

If you're storing your fertile eggs for a few days before incubating, try to copy that instinct.

Although you won't be able to see it, bacteria can lurk in storage containers. Unless you're careful with hygiene, you run the risk of contaminating your current clutch.

How to avoid problems?

If you're storing your fertile eggs in standard cardboard cartons, make sure they're new - don't use them for more than one set. Mark them "Fertile eggs - not for eating"!

If using plastic or resin containers, wash thoroughly before use. I use a baby-bottle sterilising liquid but a mild bleach solution is fine. Use one teaspoon of bleach to one litre (about one quart) of warm water.

A container like this one is ideal. It's strong, reusable and easily washed. After incubation it can be used to store eggs for eating.  

2.  Store the right way up!

A hen will keep her eggs lying sideways, and that's the way smaller incubators like the Brinsea Mini Advance (my favourite incubator) also work. But if you need to store them beforehand chances are they'll be kept on end, in a container.

If that's the case, always store with the more pointed end facing downwards, even if it's only for a short time. This makes sure the yolk stays properly suspended.

It's the way they should be set in the incubator, too. 

If the more rounded end faces down for too long there's a danger that the air cell will become dislodged and the developing embryo will die.

Experience shows that storing fertile eggs the wrong way up, and certainly incubating them the wrong way up, will result in few, if any, hatching.

3.  Turn them at least twice each day.

If you watch a broody hen (a hen who is about to sit on her clutch, or is already incubating) you'll notice that she turns them every so often both before and during incubation. 

She knows instinctively that she has to prevent the embryo sticking to the membrane inside the shell. 

So we need to do the same.

If you're storing your fertile eggs in a container, just turn the whole box upside down - no need to turn each one individually.

Make sure you mark the container so you know which side is which: a simple '1' and '2' will be fine. If you're likely to forget whether you've turned them or not, in which case mark them something like 'morning up' and 'afternoon up' so you know which side should be facing upwards at which point in the day.

Remember: if your eggs are smaller than the container you'll need to use packing to make sure they don't break when you turn them. Food grade tissue paper is a good solution. 

4.  Keep them cool and dry.

A hen knows instinctively that an embryo won't start to develop until she sits on her clutch and they reach a specific temperature. So we need to keep our own 'clutch' of fertile eggs cool and make sure they don't get wet.

This is really a question of balance. Wherever you store your eggs, their fertility will be best maintained if they're cool - but not too cold - and dry - but not too dry.

How to find the ideal setting?

Look for somewhere in your house that's not heated and not humid. A garage or a dry basement or cellar is ideal, particularly if it's got a concrete floor. The ideal temperature is between 5º and 10º Centigrade (40º to 50º Farenheit).

Whatever you do, don't store them in your refrigerator - it's too cold and the air is much too dry. In dry air, eggs will lose moisture through the shell, particularly if they're small bantams or have particularly thin or porous shells.

I've found a good way of storing fertile eggs in just enough humidity without them becoming too wet is to keep them in a carton and seal the carton inside a plastic bag.

5.  Incubate your fertile eggs as soon as possible.

If your chicks-to-be have arrived by post, or if like me you've carried them long distances, they will need to settle and come to room temperature before you set them in the incubator.

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What's next?

You've chosen your eggs and stored them correctly to make sure they remain as fertile as possible. It's nearly time to incubate!

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Looking for information about caring for chicks? Try these articles!

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