The chicks started hatching at 8:00pm on Wednesday. The first one wanted out so bad, I heard it chirping in the shell and within 10 minutes from the time it first pipped, it was out. 3 came out that night, and the next morning, I noticed 9 more had started to pip a little. The plastic thermometer that I have lays across the top of the eggs and is about 5 inches wide. It\'s very large! I have a 1583 Hovabator, and with 25 eggs in there, there wasn\'t much room for the thermometer once the eggs start to hatch.
The temperature on the incubator had been holding a steady 99.5 so I decided to take the 3 active chicks and thermometer out. After several hours, I noticed that none of the pipped eggs had gone any farther than before. I don\'t know what made me do it, but I put the thermometer back in. The temperature had shot to 103 and I don\'t know how long it had been that high. The humidity was still holding a good 60-65. I cracked the lid to let some of the heat out, then grabbed two of the pipped eggs and peeled back a little of the shell to see if the chick was still alive. They both were, so I put them back and left them alone. The temp got back to normal and the humidity stayed right. Later that evening, still nothing. This is where I need some education and info.
Right or wrong, where the eggs had pipped, I peeled back a tiny whole so they could breath, then took my fingernail and made a long crack so it would be easier for them to push the end off. I know that helping them out is a no-no, but the membrane was tougher than a rubber band around them and I\'m not sure why. I don\'t see how they could have gotten out on their own.
What made that membrane get real tough? Was it the high temperature? Something in my feeding program? Hens that are eating too much calcium?
After helping them a little with the shell, I now have 17 chicks running around in the brooder and one more that had pipped overnight and I helped get out this morning. I took one of the remaining non-pipped eggs and poked a hole in the air sack. The membrane had dried and shrunk-wrapped tightly around the chick. I dampened it lightly with warm water, then peeled the shell away from what looked like a dead chick. Once I got the top off and it\'s head free, it started breathing a little. I laid it back in the incubator with the bottom still on. It hasn\'t moved since. I\'m pretty sure it isn\'t alive now. I opened the remaining eggs and found the same thing in 3 more. They were full grown chicks that the membrane had shrunk around and dried. The humidity had never dropped below 60 the whole time, so I\'m not sure why it was dried out. I would have never attempted to interfere with the hatch had it not been for the temperature shooting up and probably being that high for over an hour or two.
As a result, I know have 18 out of 25 chicks, and out of the remaining 7 eggs, there were 4 full grown chicks, 2 that hadn\'t absorbed all of the yolk, and one I didn\'t want to open because when I candled it, it looked like fluid floating around.
Last question, if my last chick just hatched this morning, can I vaccinate it for Mareks at around 1:00pm - 2:00pm today?
Sharon