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Embryology Journal
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The Mandella Environment

Class Journal

Click here to see the embryology project page!

Day 1: Today we put 18 eggs into the incubator. Even though this is our project, Mrs. Mandella allowed the other classes to choose four eggs and label them so they could track the weight and progress of the chick eggs also.
Day 2: We have to keep the temperature and the humidity at the right levels for the eggs to develop. We will record the temperature each day on a chart.
Day 3: Weekend
Day 4: Weekend
Day 5: We are learning about the parts of the egg and the ways that those parts are helpful to the embryo. We made egg models to illustrate each part.
Day 6: The rooster and the hen are very different. Mrs. Mandella showed us how to tell the difference. We discussed the reproductive systems of both.
Day 7: We are carefully monitoring the incubator. It has to remain at 99.5 degrees and 70% humidity. We add water every two days.
Day 8: The chicks will be born on May 8th, we think. We are looking at how the chicks develop each day. We are going to make a development poster to show the changes of the embryo into a chick.
Day 9: On day nine we candled our chick eggs and Mrs. Mandella accidentally dropped one onto the candler. To candle means to hold the egg up to a light and see the shadows of the development. The egg cracked so we could not incubate it any longer. The developing chick would die. We opened up the egg and turned our accident into a learning experience. We were amazed at the changes the egg had undergone in only nine days.
We saw the vitelline blood vessels that formed just under the shell. They bring oxygen to the embryo. We saw the oversized pupils of the chicken and the chicks beak forming. The heart was beating for a short time after we opened the shell. The egg cell was enlarged, the yolk sac was there and there were loads of blood vessels everywhere. It was sad that one of our chicks died, but it was also interesting. We took some pictures and measured our baby chick. Mrs. Mandella is going to put them on the class web site.
Day 10: Weekend
Day 11: Weekend
Day 12: Today we added more water and we checked the temperature. Everything looks good. We will candle the eggs on Thursday to see more development. We are starting to put together a multi-media presentation using Microsoft Powerpoint. There are four teams that are writing slides for each area of embryology. We are working on the introduction, parts of the egg and their function.
Day 13: Today we collected data. We weighed the eggs, checked the temperature and water in the incubator. We are getting ready to make a brood. A brood is where the chicks will live when they are born. we have to have a decent size pen, with a light to keep them warm. We need food and water that is in special containers. We need to put something on the bottom so their feet won't slip.
Day 14: Today we candled the eggs. They have really grown. We see development in all the eggs. We were really surprised when one of them kept moving around. They are very active at this stage. When you candle the egg you hold it up to light. We saw the air cell, the chicks pupil, it looks like we saw feathers too. The chick is taking up most of the inside of the egg.
Day 15: Everything looks good. We are all getting real excited. We have to build a brood for the chicks when they are born. A brood a place where they will live until the get big enough to leave us. The brood will be about four feet long and it needs to have a source of light for warmth. They need food, water and a floor in it that will not be slippery otherwise they will get straddle legs and they won't walk properly.
Day 16: Weekend
Day 17: Weekend
Day 18: Today the eggs were taken out of the egg turner and placed onto cheese cloth inside the incubator. We can't touch them anymore. They will get into a position to start hatching. We expect our babies on Day 21.
Day 19: We added water because the humidity is most important at this stage. They need to be moist to get out of their shells. It helps them move around more easily. 
Day 20: Happy Birthday and surprise. We had 6 babies born today, a day early. Did we miscalculate or was the incubator too warm? We think that the eggs may have started incubating on the day Mrs. Mandella picked them up because that was the day that it was in the 90's. The eggs will start incubating as long as the temperature is high enough.  They look really wet and tired when they come out, but they walk in just a few minutes. They only chirp when we open the incubator because they get cold. When they dry we will move them to the brood. The brood's temperature is ninety degrees which is about ten degrees cooler than the incubator. They will adapt to room temperature in about a week.
Day 21: Happy Birthday! We are the proud surrogate parents of  1 baby chick. Stop by our classroom and see them! All together we have 7 baby chicks!

Chick Brood
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Mr. Chirco helped build this chick brood. Chickens will live here for a few weeks.
The Seven Dwarfs
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Here are the seven chicks, all doing well.

Hova-Bator Incubator
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Eggs are placed into this incubator for 21 days. Temperature and humidity are monitored daily.

Daily Data Collection
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Vincent checks and records temperature of incubator.

Does egg weight change as the chick develops?
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Leydi and Maryuri weigh eggs to answer their question. Yes it does change, but how?

Egg Scale
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This is the scale we use to weigh the eggs. Eggs weighed between 60g and 70g at start of incubation.

Egg Candling
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One of the students candles the egg to see if their is any development.

Place onto cheesecloth
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They cannot be handled anymore until birth.
Beginning Pecks
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Within 24 hours they will peck their way out of the shell.
Here they are!
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We only had to wait 20 days for them! Surprise!
Students Are AMAZED!
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We are the surrogate parents!

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