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Chicken Embryology

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

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

  2. 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

  3. Day 1

  4. 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

  5. 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

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

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

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

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

  10. Day 8 • Feathers begin to form • Eye lids begin to form

  11. Day 9 • Mouth opening appears • Claws begin to form

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

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

  14. Day 12 • Scales appear on the lower legs • Continual growth

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

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

  17. Day 15 • The scales, claws, and beak are becoming firm

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

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

  20. Day 18 • Growth is nearly complete • Amnion begins to disappear

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

  22. 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

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

  24. The nose begins to form on day 5. • True • False

  25. When does the head begin to form? • 36 hours • 2 days • 5 days • 22 hours

  26. The wings bend at the elbow, leg, and knee on day…. • Day 3 • Day 8 • Day 12 • Day 7 • Day 14

  27. 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

  28. How many days does it take to hatch a chicken egg? • 21 days • 22 days • 20 days • 24 days

  29. The shell is made up of phosphorus. • True • False

  30. The egg white is also known as the… • Yolk • Allantois • Membrane • Albumin

  31. Shell membranes are added in the Isthmus. • True • False

  32. It takes ______ days for turkey eggs to hatch. • 21 • 25 • 28 • 26

  33. It takes ____ days for a duck egg to hatch. • 33-35 • 29-32 • 22-25 • 21-23

  34. What kind of incubator do we use? • Still-air • Forced-air

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