Periodic Check Of Eggs During Incubation (Candling); Hatching And Birth Of The Chick - river systems ET 49 Notice D'emploi

7 – PERIODIC CHECK OF EGGS DURING INCUBATION (CANDLING)
The candling is a delicate and complex operation that can lead to eliminating fertilized eggs by mistake. Since it is facultative, if you are not
experienced we recommend proceeding directly with the incubation.
You can periodically check the incubated eggs by candling them. This operation should be carried out in a dark room, using a strong beam (e.g.
the River Systems' egg tester art. 164), as per the following chart:
Species
Hen
Pheasant
Guinea fowl
Turkey
Partridge
Peacock
Goose
Duck / Mallard
Muscovy duck
Take the eggs individually from the incubator and check them immediately. The egg can stay out of the incubator for maximum 2 minutes. With
a little experience, and if you use the egg tester, you can candle the eggs without lifting them. In this case, open the incubator and lay the egg
tester on each egg. The beam allows you to see the embryo. Never shake or turn violently the egg as this can break the blood vessels and
therefore cause the death of the embryo.
1 check: beginning of incubation
st
Normally it is difficult to see the embryo, as it is incorporated in the yolk: next to the air cell and at its point you shall see blood vessels. If the egg
is not fertilized its inside is uniform, doesn't show blood vessels and the yolk is right in the middle. Discard these eggs.
It is possible that eggs with a thick shell or brown ones don't allow a clear view of their interior at this stage: leave them to the second check.
2 check: development of the embryo
nd
You will normally see a network of blood vessels at the point of the egg and the embryo will look like a dark spot. If the blood vessels are not
present, it means that the embryo is lost.
3 check: verification of the embryo
rd
Normally the embryo occupies the entire egg, therefore the blood vessels shall be no longer visible. The air cell is big. If the embryo doesn't fill
the whole egg, blood vessels are still visible, the air cell is small and the albumen has not been used up, it means that the embryo is
underdeveloped and the egg should be discarded.
8 – HATCHING AND BIRTH OF THE CHICK
The following operation is very delicate and should be executed quickly to prevent the eggs from cooling. We suggest that two people perform it
in order to reduce the time as much as possible.
Three days before the expected hatching date:
Only for art. 549/A: stop the egg turning unit by unplugging it when the eggs are in a vertical position: this will facilitate the removal of the egg
tray after the eggs have been taken out.
A) Remove the eggs from the swinging tray and place them gently on a blanket.
B) Only for art. 549: remove the metal handle from the front of the incubator.
C) Remove the egg tray.
Only for art. 549/A: to remove the egg tray, simply lift it, pulling it out from the steel
tongue of the egg turning unit (be careful to reinsert it correctly when you relocate the
egg tray).
If after several incubation cycles you notice that the slit where the egg turning unit steel
tongue is inserted is too large, swap the row with another of the tray.
1 check
st
at 8 days
at 8 days
at 8 days
at 8 days
at 8 days
at 9 days
at 9 days
at 9 days
at 10 days
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2 check
nd
at 11 days
at 12 days
at 13 days
at 13 days
at 12 days
at 14 days
at 15 days
at 13 days
at 15 days
3 check
rd
at 18 days
at 19 days
at 24 days
at 24 days
at 19 days
at 24 days
at 24 days
at 24 days
at 25 days