Bad eggs might have a dark spot that looks like a fingernail clipping. Bad eggs should be thrown out before they smell foul and get the other eggs sick (eggs can breathe!). Day 4 will show us something much more exciting – bloodvessels and a circular dark colored ring!Īround the 5th day you’ll definitely be able to see which eggs are developing and which aren’t. Here you see what it looks like on Day 1, which is not any more distinguishable than unfertilized egg. The best part about hatching your own eggs is watching them develop! Holding them over the light reveals whether or not your eggs are fertile. It’s best to leave the thermometer on top of the eggs, because still air incubators are subject to temperature layering (hot air rises!) so you want to find out the temperature exactly at egg level. We’ve also found that covering the lightbulb with tinfoil helps keep the temperature inside more stable. 25 watt bulb), you will want to leave the lid slightly open to regulate the temperature and air flow. If it’s too cool, you can cover the outside of the plexiglass with a towel or tin foil to reflect the light back in. If you’re using a 15 watt bulb, you will most likely be able to leave the lid completely closed which will keep the temperature much more stable. As an alternative, you could use some fine chicken wire mesh to cover the outside of a light bulb. We made things easy for ourselves by buying the type of lamp which comes with a metal and plastic lining, which would help radiate the heat outwards and act as a barrier to keep the ducklings from burning themselves when they hatch out.
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