Chicken Chicken EmbryologyEmbryology

Development of a chick in the Development of a chick in the egg…..egg…..

How a chick develops day by How a chick develops day by day during incubationday during incubation

Day 1:Day 1:18 hours: digestive system starts to appear18 hours: digestive system starts to appear20 hours: vertebral column starts to appear20 hours: vertebral column starts to appear21 hours: nervous system starts to appear 21 hours: nervous system starts to appear

and brain begins to formand brain begins to form22 hours: head begins to form22 hours: head begins to form23 hours: blood systems begin to form23 hours: blood systems begin to form24 hours: eyes begin to form24 hours: eyes begin to form

Day 1Day 1

Day 2Day 2

25 hours: heart begins to form25 hours: heart begins to form35 hours: ear pits begin to form35 hours: ear pits begin to form37 hours: amnion starts to appear37 hours: amnion starts to appear42 hours: heart begins to beat42 hours: heart begins to beat46 hours: throat begins to form46 hours: throat begins to form

Day 3Day 3

50 hours: amnion begins to form50 hours: amnion begins to form60 hours: nose begins to form60 hours: nose begins to form62 hours: legs start to appear62 hours: legs start to appear64 hours: wings start to appear64 hours: wings start to appear70 hours: allantois begins to form70 hours: allantois begins to form

Day 4Day 4

Tongue begins to formTongue begins to formTail appearsTail appearsToes begin to formToes begin to formCirculation is fully functionalCirculation is fully functional

Day 5Day 5

Crop begins to formCrop begins to formBones of the legs begin to formBones of the legs begin to formSex of the chick is determinedSex of the chick is determinedReproductive organs begin to formReproductive organs begin to form

Day 6Day 6

Beak and egg-tooth begin to formBeak and egg-tooth begin to formRibs start to appearRibs start to appearGizzard begins to formGizzard begins to formVoluntary movement beginsVoluntary movement begins

Day 7Day 7

Wings bend at elbow, leg and kneeWings bend at elbow, leg and kneeToes are visibleToes are visibleAbdomen is bigger as the intestine Abdomen is bigger as the intestine

starts to loopstarts to loop

Day 8Day 8

Feathers begin to formFeathers begin to formEye lids begin to formEye lids begin to form

Day 9Day 9

Mouth opening appearsMouth opening appearsClaws begin to formClaws begin to form

Day 10Day 10

Beak begins to hardenBeak begins to hardenComb is visibleComb is visibleFlight feathers developFlight feathers develop

Day 11Day 11

Toe claws begin to curve downwardsToe claws begin to curve downwardsBottom of feet become paddedBottom of feet become paddedChick begins to take calcium from Chick begins to take calcium from

the eggshellthe eggshell

Day 12Day 12

Scales appear on the lower legsScales appear on the lower legsContinual growthContinual growth

Day 13Day 13

Body fairly well covered with feathersBody fairly well covered with feathersLeft and right collar bones join to Left and right collar bones join to

form the wishbone form the wishbone

Day 14Day 14

Embryo turns its head towards the large Embryo turns its head towards the large end of the eggend of the egg

Skull and ribs begin to ossifySkull and ribs begin to ossify

Day 15Day 15

The scales, claws, and beak are becoming firmThe scales, claws, and beak are becoming firm

Day 16Day 16

Chick is fully covered with feathersChick is fully covered with feathersAlbumen is nearly gone and the yolk Albumen is nearly gone and the yolk

is more important as nourishmentis more important as nourishment

Day 17Day 17

Chick turns its beak towards the air cellChick turns its beak towards the air cellBegins preparation for hatchingBegins preparation for hatching

Day 18Day 18

Growth is nearly completeGrowth is nearly complete Amnion begins to disappearAmnion begins to disappear

Day 19Day 19

Yolk sac begins to enter the bodyYolk sac begins to enter the body Chick occupies all space in the egg except the air Chick occupies all space in the egg except the air

cellcell

Day 20Day 20

Yolk sac is completely drawn into the Yolk sac is completely drawn into the bodybody

Beak breaks through inner shell Beak breaks through inner shell membranemembrane

Lungs begin to function and use the Lungs begin to function and use the air cell for breathingair cell for breathing

Allantois ceases to function and Allantois ceases to function and begins to dry upbegins to dry up

Time for….Time for….

THE QUIZ!!!!THE QUIZ!!!!Get your clicker from me………answer Get your clicker from me………answer

the questions that follow with your the questions that follow with your clicker…..clicker…..

The nose begins to form on day The nose begins to form on day 5.5.

0%0%

1.1. TrueTrue

2.2. FalseFalse

When does the head begin to When does the head begin to form?form?

0% 0%0%0%

1.1. 36 hours36 hours

2.2. 2 days2 days

3.3. 5 days5 days

4.4. 22 hours22 hours

The wings bend at the elbow, The wings bend at the elbow, leg, and knee on day….leg, and knee on day….

0%0%0%0%0%

Day 3 Day 8 Day 12 Day 7 Day 14

1.1. Day 3Day 3

2.2. Day 8Day 8

3.3. Day 12Day 12

4.4. Day 7Day 7

5.5. Day 14Day 14

This word deals with what we This word deals with what we are doing with the are doing with the eggs….I_C_B_T_O_eggs….I_C_B_T_O_

0% 0%0%0%

1.1. I A N N UI A N N U

2.2. E V I O NE V I O N

3.3. T U L I AT U L I A

4.4. E U Y H EE U Y H E

How many days does it take to How many days does it take to hatch a chicken egg?hatch a chicken egg?

0% 0%0%0%

1.1. 21 days21 days

2.2. 22 days22 days

3.3. 20 days20 days

4.4. 24 days24 days

The shell is made up of The shell is made up of phosphorus.phosphorus.

0%0%

1.1. TrueTrue

2.2. FalseFalse

The egg white is also known as The egg white is also known as the…the…

0% 0%0%0%

1.1. YolkYolk

2.2. AllantoisAllantois

3.3. MembraneMembrane

4.4. AlbuminAlbumin

Shell membranes are added in Shell membranes are added in the Isthmus.the Isthmus.

0%0%

1.1. TrueTrue

2.2. FalseFalse

It takes ______ days for turkey It takes ______ days for turkey eggs to hatch.eggs to hatch.

0% 0%0%0%

1.1. 2121

2.2. 2525

3.3. 2828

4.4. 2626

It takes ____ days for a duck egg It takes ____ days for a duck egg to hatch.to hatch.

0% 0%0%0%

1.1. 33-3533-35

2.2. 29-3229-32

3.3. 22-2522-25

4.4. 21-2321-23

What kind of incubator do we What kind of incubator do we use?use?

0%0%

1.1. Still-airStill-air

2.2. Forced-airForced-air