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

How a chick develops day by day during incubation Day 1: Day 1: 18 hours: digestive system starts to appear 18 hours: digestive system starts to appear 20 hours: vertebral column starts to appear 20 hours: vertebral column starts to appear 21 hours: nervous system starts to appear and brain begins to form 21 hours: nervous system starts to appear and brain begins to form 22 hours: head begins to form 22 hours: head begins to form 23 hours: blood systems begin to form 23 hours: blood systems begin to form 24 hours: eyes begin to form 24 hours: eyes begin to form

Day 1

Day 2 25 hours: heart begins to form 25 hours: heart begins to form 35 hours: ear pits begin to form 35 hours: ear pits begin to form 37 hours: amnion starts to appear 37 hours: amnion starts to appear 42 hours: heart begins to beat 42 hours: heart begins to beat 46 hours: throat begins to form 46 hours: throat begins to form

Day 3 50 hours: amnion begins to form 50 hours: amnion begins to form 60 hours: nose begins to form 60 hours: nose begins to form 62 hours: legs start to appear 62 hours: legs start to appear 64 hours: wings start to appear 64 hours: wings start to appear 70 hours: allantois begins to form 70 hours: allantois begins to form

Day 4 Tongue begins to form Tongue begins to form Tail appears Tail appears Toes begin to form Toes begin to form Circulation is fully functional Circulation is fully functional

Day 5 Crop begins to form Bones of the legs begin to form Sex of the chick is determined Reproductive organs begin to form

Day 6 Beak and egg-tooth begin to form Beak and egg-tooth begin to form Ribs start to appear Ribs start to appear Gizzard begins to form Gizzard begins to form Voluntary movement begins Voluntary movement begins

Day 7 Wings bend at elbow, leg and knee Wings bend at elbow, leg and knee Toes are visible Toes are visible Abdomen is bigger as the intestine starts to loop Abdomen is bigger as the intestine starts to loop

Day 8 Feathers begin to form Feathers begin to form Eye lids begin to form Eye lids begin to form

Day 9 Mouth opening appears Mouth opening appears Claws begin to form Claws begin to form

Day 10 Beak begins to harden Beak begins to harden Comb is visible Comb is visible Flight feathers develop Flight feathers develop

Day 11 Toe claws begin to curve downwards Toe claws begin to curve downwards Bottom of feet become padded Bottom of feet become padded Chick begins to take calcium from the eggshell Chick begins to take calcium from the eggshell

Day 12 Scales appear on the lower legs Scales appear on the lower legs Continual growth Continual growth

Day 13 Body fairly well covered with feathers Body fairly well covered with feathers Left and right collar bones join to form the wishbone Left and right collar bones join to form the wishbone

Day 14 Embryo turns its head towards the large end of the egg Embryo turns its head towards the large end of the egg Skull and ribs begin to ossify Skull and ribs begin to ossify

Day 15 The scales, claws, and beak are becoming firm The scales, claws, and beak are becoming firm

Day 16 Chick is fully covered with feathers Chick is fully covered with feathers Albumen is nearly gone and the yolk is more important as nourishment Albumen is nearly gone and the yolk is more important as nourishment

Day 17 Chick turns its beak towards the air cell Chick turns its beak towards the air cell Begins preparation for hatching Begins preparation for hatching

Day 18 Growth is nearly complete Growth is nearly complete Amnion begins to disappear Amnion begins to disappear

Day 19 Yolk sac begins to enter the body Yolk sac begins to enter the body Chick occupies all space in the egg except the air cell Chick occupies all space in the egg except the air cell

Day 20 Yolk sac is completely drawn into the body Beak breaks through inner shell membrane Lungs begin to function and use the air cell for breathing Allantois ceases to function and begins to dry up

Time for…. THE QUIZ!!!! THE QUIZ!!!! Get your clicker from me………answer the questions that follow with your clicker….. Get your clicker from me………answer the questions that follow with your clicker…..

The nose begins to form on day True 2. False

When does the head begin to form? hours 2. 2 days 3. 5 days hours

The wings bend at the elbow, leg, and knee on day…. 1. Day 3 2. Day 8 3. Day Day 7 5. Day 14

This word deals with what we are doing with the eggs….I_C_B_T_O_ 1. I A N N U 2. E V I O N 3. T U L I A 4. E U Y H E

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

The shell is made up of phosphorus. 1. True 2. False

The egg white is also known as the… 1. Yolk 2. Allantois 3. Membrane 4. Albumin

Shell membranes are added in the Isthmus. 1. True 2. False

It takes ______ days for turkey eggs to hatch

It takes ____ days for a duck egg to hatch

What kind of incubator do we use? 1. Still-air 2. Forced-air