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INCUBATING w/FRIENDS! come HATCH, LEARN, & Chat! w/hosts, Sally Sunshine & BantyChooks - Page 3487post #34862 of 1576311/16/16 at 6:44pmpost #34863 of 1576311/16/16 at 6:53pmQuote:Originally Posted by rIrs roost
@Sally SunshineI'm gonna hatch eggs under water in a dehydrator. Bubbles told me how
Just finished reading the manual on dehydrating nothing in there about hatching under water.post #34864 of 1576311/16/16 at 6:54pmThread StarterQuote:Originally Posted by country lovin
Is there a time frame where I should get worried of I don't see an external pip
I cant find the read I want to show you, I will have to search for it tomorrow, your doing fine it can be almost 12 hours or more for big breeds and ducks until they do an external
EDIT adding moreQuote:
Hatching behavior is well described in literature and begins on d 16 or 17 of incubation in the chick embryo (Oppenheim, 1970, 1972; Provine, 1971, 1972; Oppenheim et al., 1978; Pittman et al., 1978). The embryo turns its body to the correct position: a folded neck and head under the air space membrane on d 18. Such neck folding is maintained after both internal and external pipping and until the chick escapes from the shell once hatching is complete. From d 19 and 20, hatching behavior is more active and vigorous head movements cause its beak to penetrate the membrane (internal pipping). The allantois, which previously served as its mode of gas exchange, begins to dry up as the chick starts pulmonary respiration. A period of relative inactivity follows, punctuated by occasional vigorous whole-body and head movements about 24 h before hatching. Then, the chick continues to push its head outward using the sharp horny structure on the upper beak (egg tooth) and the hatching muscle on the back of the neck to open a spot on the eggshell (external pipping). This is followed by another quiescent period until the hatching behavior on d 20 or 21. A series of back thrusts with the beak and egg tooth against the shell enlarges the hole made by external pipping, which, together with repeated partial body rotations achieved by stepping movements of the feet against the shell, lead to the top of the shell being loosened sufficiently to be pushed off. However, it is not clear what causes the sudden appearance of the required active behaviors after the period of inactivity that follows external pipping. External influences such as vocal-auditory interactions between the hen and chick, between chicks in the same clutch, or both, may influence the timing. Another assumption is that hatching initiates once the partial pressure of CO2 (pCO2 ) threshold in the air cell is reached and increases metabolic demand. Blood pCO2 and air cell pCO2 are increasing with embryonic development. From d 14 to 18, air cell pCO2 increases from 15 to 34 mmHg (Bruggeman et al., 2007). Furthermore, high ambient CO2 can cause higher blood and air cell pCO2 in the early stage of incubation (De Smit et al., 2006; Bruggeman et al., 2007). Up to d 19, oxygen supply occurs only via blood circulating through the chorioallantoic membrane (Mortola, 2009). From d 19 to 20, however, the chick pierces the air-space membrane of the egg with its beak (internal pipping), which allows pulmonary respiration to begin. Thereafter, until hatching is complete at about d 20 or 21, oxygen supply occurs via both the chorioallantoic membrane and the lungs. The oxygen contributed via the chorioallantois declines to low levels during this period, but the pulmonary contribution compensates with a 1.5- to 2-fold rise. This is aided at approximately d 19 or 20 by the chick penetrating the eggshell with its beak (external pipping) and thereby gaining access to atmospheric air. There needs to be an overall balance between delivery of oxygen by these means and an increase in oxygen demand by the chick as it grows, as well as the marked increase in demand associated with prehatching and hatching behavior (Menna and Mortola, 2002; Mellor and Diesch, 2007).
HOW THE CHICK EMERGES FROM THE SHELL
The head of the chick develops at the large end of the egg. Between the 15th and 16th days, the chick orients itself so that its head is near the air cell at the large end of the egg. Not long before the chick is ready to attempt to make its way out of the shell its neck acquires a double bend so that its beak is under its right wing and pointed toward the air cell. About the 19th day the chick thrusts its head forward. Its beak quickly breaks through the inner shell membrane, and the chick's lungs begin to function. Complete breathing by the lungs usually does not occur until the 20th day of incubation.
Using its egg tooth (a tiny, sharp, horny projection on the end of its beak), the chick pecks at the shell thousands of times. Finally, the young bird pips its way through the shell and begins to breathe air directly from the outside. After the chick has made a hole in the shell, it stops pipping for three to eight hours and rests. During this time, it is acclimating its lungs to the outside atmosphere. After the resting stage is completed, the second stage of pipping begins.
The chick begins to turn slowly inside the egg. As it turns, usually counter-clockwise, the cutting edge of the chick tooth continues to chip away. In two to five hours, the chick has made about three quarters of a turn inside the egg. As the chick progresses in its movement around the shell, it begins pushing on the egg cap (large end). Squirming and struggling, the chick works feverishly for about 40 minutes pushing at the cap. Finally with a vigorous shove, the chick breaks free from the shell, still wet and panting.
When the chick is freed completely from the shell, it lies still. Its energy has been virtually exhausted, and it is extremely tired. After a rest of some few minutes, the chick begins to rise to its feet and gain coordination of its muscles. Within a few days the egg tooth, its usefulness over, will disappear.
Edited by Sally Sunshine - 1/16/16 at 6:57pmpost #34865 of 1576311/16/16 at 6:55pm
Serama lover! Home of the Super Serama Bunch! Don't forget cochins. 26 Seramas, 1 duccles, 6 layer bird! Make sure to follow Kate's Sassy Seramas as we can ship birds soon!
Serama lover! Home of the Super Serama Bunch! Don't forget cochins. 26 Seramas, 1 duccles, 6 layer bird! Make sure to follow Kate's Sassy Seramas as we can ship birds soon!post #34866 of 1576311/16/16 at 6:58pmpost #34867 of 1576311/16/16 at 6:58pmpost #34868 of 1576311/16/16 at 7:00pm
Serama lover! Home of the Super Serama Bunch! Don't forget cochins. 26 Seramas, 1 duccles, 6 layer bird! Make sure to follow Kate's Sassy Seramas as we can ship birds soon!post #34869 of 1576311/16/16 at 7:00pmThread StarterQuote:Originally Posted by Pensmaster
Quote:Originally Posted by rIrs roost
@Sally SunshineI'm gonna hatch eggs under water in a dehydrator. Bubbles told me how
Just finished reading the manual on dehydrating nothing in there about hatching under water.post #34870 of 1576311/16/16 at 7:01pm
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