Yu jie and siew leng 3.9


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Yu jie and siew leng 3.9

  1. 1. Life Cycle of a Chicken By Yu Jie and Siew Leng of Pri 3.9
  2. 2. Life Cycle of a Chicken <ul><li>The Yolk: The chicken egg starts as an egg yolk inside a hen. A yolk is produced by the hen's ovary in a process called ovulation. </li></ul><ul><li>Fertilization: The yolk is released into the long tube in the hen's reproductive system where it can be fertilized inside the hen by a sperm. </li></ul><ul><li>The Egg White : The yolk continues down the long tube in the hen's reproductive system (whether or not it is fertilized) and is covered with a membrane, structural fibers, and layers of the egg white.. </li></ul><ul><li>The Chalazae : As the egg goes down through the oviduct, it is continually rotating within the spiraling tube. This movement twists the structural fibers (called the chalazae), which form rope-like strands that anchor the yolk in the thick egg white. There are two chalazae anchoring each yolk, on opposite ends of the egg. </li></ul><ul><li>The Eggshell : The eggshell is deposited around the egg in the lower part of the oviduct of the hen, just before it is laid. The shell is made of calcite, a crystalline form of calcium carbonate. </li></ul>
  3. 3. Stages in its Life Cycle
  4. 4. Hatching Eggs <ul><li>The rooster must be present for an egg to be fertilized. Most eggs we buy at the supermarket are from hens that are raised without a rooster being present. If the egg is laid by a hen that has not mated with a cock, the ovum will not develop. </li></ul>
  5. 5. Inside a Chicken Egg           shell blastodisc chalaza Air cell yolk Thick albumin
  6. 6. Inside a Chicken Egg Day 1 Day 6 Day 13 The brain and nervous system begin to form. The head begins to form. Blood appear. The eyes begin to form The beak becomes visible. The wing bends at the elbow. The ribs begin to appear. The muscular, thick-walled part of a bird's stomach begins to form. The intestines begin to form a curve that bends round and crosses itself. Fingers of the wings are covered with feather a small rounded part or organ of the body . The left and right collar bones fuse to form the wish bone.
  7. 7. From Egg to Chick Day 17 Day 21 The beak turns towards the air cell. The egg tooth pips through the shell. Exhausted and wet - but alive - the chick has hatched!
  8. 8. Hear from the EGGxperts... <ul><li>What have you learnt? What was most interesting? </li></ul><ul><li>What was challenging for you and your partner? </li></ul><ul><li>We learnt that how chickens reproduce, what happens inside the egg and how to cooperate with our partner. </li></ul><ul><li>We searched the websites and pictures together. </li></ul><ul><li>At times, we could not agree on the ideas and we could not find the information we want. </li></ul>
  9. 9. Websites Used <ul><li>http://www.enchantedlearning.com/subjects/birds/info/chicken.shtml </li></ul><ul><li>http://lhsfoss.org/fossweb/teachers/materials/plantanimal/chickeneggs.html </li></ul><ul><li>http://chickscope.itg.uiuc.edu/explore/embryology/ </li></ul>
  10. 10. Thank you!