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Chicken Egg Hatching Cycle

Check-out this breakdown of the twenty-one-day cycle of a chicken egg covering development post-fertilization to hatching.

| December 2017

  • Chickens imprint on the first moving object that they see, typically their mother.
    Photo by Laurie O’Keefe/Getty Images
  • It can take up to 24 hours for a chick to break through an egg once it has piped. Typically it is less time, 12-18 hours with resting periods is normal.
    Photo by Edward Kinsman/Getty Images
  • In “How to Speak Chicken” Melissa Caughey strives for sustainability and responsibility when raising chickens and stresses the importance of utilizing a scientific eye to understand their behavior.
    Cover courtesy Storey Publishing

How to Speak Chicken (Storey Publishing, 2017) explores tips, tidbits, and scientific facts that are essential for raising your own backyard chickens. Understanding the way chickens sense the world and communicate impending danger, techniques for watching your flock, and insights into how they establish pecking order are all covered by author Melissa Caughey. Additionally she offers insight into chicken body language, intelligence, social interaction, emotion, and problem solving abilities.  

Inner Workings of the Egg

From the time the egg is fertilized, the chick develops rapidly. It takes just 21 days for a chick to grow inside the egg and hatch. The eggshell is made of almost pure calcium carbonate, with more than 17,000 tiny pores to allow air and moisture to pass through. All eggs are coated in a bloom (or cuticle) that helps prevent bacteria and viruses from getting inside the egg. Here is a peek inside this incredible process. 

Day 1: The fertilized egg begins to develop the embryonic disk, where the embryo forms. An air sac in the rounded end adjusts internal egg pressure and air for respiration as the chick grows.

Day 2: The vitelline membrane, which surrounds the vitellus (yolk), begins to form. It allows the albumen (egg white) to pass into the vitellus to nourish the embryo.

Day 3: Blood vessels begin to form, and the head, torso, brain, and beating heart are visible.

Day 4: The amniotic sac begins to develop. 

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