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Chicken Embryology. Development of a chick in the egg…. How a chick develops day by day during incubation. Day 1: 18 hours: digestive system starts to appear 20 hours: vertebral column starts to appear 21 hours: nervous system starts to appear and brain begins to form
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Chicken Embryology Development of a chick in the egg…..
How a chick develops day by day during incubation • Day 1: • 18 hours: digestive system starts to appear • 20 hours: vertebral column starts to appear • 21 hours: nervous system starts to appear and brain begins to form • 22 hours: head begins to form • 23 hours: blood systems begin to form • 24 hours: eyes begin to form
Day 2 • 25 hours: heart begins to form • 35 hours: ear pits begin to form • 37 hours: amnion starts to appear • 42 hours: heart begins to beat • 46 hours: throat begins to form
Day 3 • 50 hours: amnion begins to form • 60 hours: nose begins to form • 62 hours: legs start to appear • 64 hours: wings start to appear • 70 hours: allantois begins to form
Day 4 • Tongue begins to form • Tail appears • Toes begin to form • 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 • Ribs start to appear • Gizzard begins to form • Voluntary movement begins
Day 7 • Wings bend at elbow, leg and knee • Toes are visible • Abdomen is bigger as the intestine starts to loop
Day 8 • Feathers begin to form • Eye lids begin to form
Day 9 • Mouth opening appears • Claws begin to form
Day 10 • Beak begins to harden • Comb is visible • Flight feathers develop
Day 11 • Toe claws begin to curve downwards • Bottom of feet become padded • Chick begins to take calcium from the eggshell
Day 12 • Scales appear on the lower legs • Continual growth
Day 13 • Body fairly well covered with feathers • Left and right collar bones join to form the wishbone
Day 14 • Embryo turns its head towards the large end of the egg • Skull and ribs begin to ossify
Day 15 • The scales, claws, and beak are becoming firm
Day 16 • Chick is fully covered with feathers • Albumen is nearly gone and the yolk is more important as nourishment
Day 17 • Chick turns its beak towards the air cell • Begins preparation for hatching
Day 18 • Growth is nearly complete • Amnion begins to disappear
Day 19 • Yolk sac begins to enter the body • 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!!!! • Get your clicker from me………answer the questions that follow with your clicker…..
The nose begins to form on day 5. • True • False
When does the head begin to form? • 36 hours • 2 days • 5 days • 22 hours
The wings bend at the elbow, leg, and knee on day…. • Day 3 • Day 8 • Day 12 • Day 7 • Day 14
This word deals with what we are doing with the eggs….I_C_B_T_O_ • I A N N U • E V I O N • T U L I A • E U Y H E
How many days does it take to hatch a chicken egg? • 21 days • 22 days • 20 days • 24 days
The shell is made up of phosphorus. • True • False
The egg white is also known as the… • Yolk • Allantois • Membrane • Albumin
Shell membranes are added in the Isthmus. • True • False
It takes ______ days for turkey eggs to hatch. • 21 • 25 • 28 • 26
It takes ____ days for a duck egg to hatch. • 33-35 • 29-32 • 22-25 • 21-23
What kind of incubator do we use? • Still-air • Forced-air