Hatching Duck Eggs (part 4)

September 2, 2008 | By Anonymous

More On Candling

Eggs can be candled after about seven days of incubation. The advantage of candling is that you can remove infertile or rotten, infected eggs. Eggs are candled in a dark room by shining a flashlight or other bright light into the egg. You should look for veins going from the interior of the egg to the air sac. If you see no clear, distinct blood veins, the chances are that the embryo never developed or died early on. So that you can know what an infertile egg looks like when it is candled, also candle a regular infertile egg that has not been incubated at all. You can see the darker, orange shadow of the yolk. If you are not sure if the embryo is alive or not, return it to the incubator. The only eggs you do not want to return are the infected eggs. They are normally dark and blotchy inside and may also appear darker through the shell in normal lighting. If they are returned, the bacteria may continue to grow and you risk the possibility of them exploding in your incubator. You also risk infecting other eggs.

If the embryo dies within the first several days, often there is a ring or a streak of blood through the egg. Most embryo deaths occur the first or last several days of incubation. It is during these periods that the most critical development occurs.

Waterfowl eggs have a greater tendency to rot and cause problems for two reasons. The first is that ducks are not as clean in their nests and the eggs are often soiled. Waterfowl also take longer to develop, allowing another week for bacteria to grow.

All of our eggs are washed immediately after collection to reduce the bacterial load on the shell surface. We use a quaternary ammonia compound that has a residual bacteriastat. It is important to keep your incubator clean and wash it out after each group of egg hatches. You want each set of eggs to be in a clean, disinfected environment as the temperature and humidity in an incubator are ideal for the growth of bacteria.
Holding Eggs Before The Incubation Period

Eggs can be held for about a week before incubation without a problem. The ideal holding temperature is about 60 degrees. A refrigerator is too cold. Development of the embryo only begins when the egg is warmed to the correct temperature.

SOURCE: www.duckeggs.com/hatching-eggs.html
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