Facts About Baby Chickens – From Incubation to Independence
This week we present an essay describing facts about baby chickens, penned by Dr. Karen Davis, President of United Poultry Concerns. You will recall that in her previous essay, Dr. Davis had explained about the “hen” as a symbol of “motherhood.” This essay is all about chicks – from the time of the first signs of their life inside the egg till they are ready to live independently. Dr. Davis elucidates the processes and behaviors as they occur in Nature.
We urge readers to note how contrasting life is for chicks who are born as part of the chicken meat and egg industries.
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Birth of a Baby Chicken
By Karen Davis, PhD, President of United Poultry Concerns
If the egg has been fertilized, a tiny being is growing inside, whether nestled beneath the mother hen or crammed in an incubator among thousands of other embryos. During the first 24 hours after the egg is laid, the tiny heart starts beating and blood vessels begin to form, joining the embryo and the yoke sac that will nourish the embryo as it grows.
From the 21st hour till sixth day of incubation – Origin of the nervous system and different organs
The nervous system originates during the 21st hour of incubation, followed by origination of the head and eyes. Other body parts begin to develop during this time, including the alimentary tract and the spinal column. On the third day, the embryo begins to rotate to lie on its left side. By the fourth day, all body organs are present, with the nose, legs, wings, and tongue taking shape and the vascular system in place.
On the fifth day, the reproductive organs differentiate and the face begins to assume a lifelike appearance. On the sixth day, the beak and the egg tooth (a kind of rough edge that disappears after hatching, which protects the beak and also helps crack the shell) can be seen, along with some voluntary movements of the embryo.
Seventh till seventeenth day from incubation – Appearance of chick down and preparations to hatch
During the next seven days, the body develops rapidly, including the formation of the abdomen and intestines. Feather germs, the origin of feather tracts, appear, the beak begins to harden, toes and leg scales start to show, the skeleton begins to calcify, and chick down appears.
On the fourteenth day, the embryo, now covered with down, rotates to arrange itself parallel to the long axis of the egg, normally with its head toward the large end of the egg near the air cell. On the seventeenth day, the chick turns its head, placing its beak under its right wing toward the lower part of the enlarged air cell to prepare for hatching and breathing outside the shell.
Day 21 from incubation – A baby chicken is born
On the nineteenth day, the yoke sac begins to enter the chick’s body through the umbilicus, and the chick positions itself for pipping the shell, that is, for making a hole in the shell to breathe through while struggling to get out. On the twentieth day, the yolk sac completes it absorption into the body cavity and the umbilicus begins to close. By now, the chick occupies the entire area within the shell except the air cell, which it now begins to penetrate with its beak, inhaling outside air through its lungs for the first time.
After pipping the shell to reach the air cell, the chick rests for several hours. It then cuts a circular line counterclockwise around the shell by striking the shell with its egg tooth near the large end of the egg, aided by a special pipping muscle in its neck which helps it to force its beak through the membranes lining the shell.
With the egg tooth, the chick saws its way out of the shell, aided by the mother hen if she is there and help is needed. Between 10 and 20 hours after the shell is first broken, the chick emerges, wet and exhausted, to face the life ahead.
Facts about the birth of baby chickens – A very systematic process
Nearly two days may pass between the hatching of the first chick and the appearance of the last member of the brood. Thus, some chicks may be almost two days old by the time all of their sisters and brothers have struggled from their shells, as many as 16 others. However, hatching is not a haphazard process.
About 24 hours before the chick is ready to hatch, it starts peeping in its shell to notify its mother and siblings that it is ready to emerge. A communication network is established among the chicks, and between the chicks and their mother, who must stay composed while all the peeping, sawing, and egg-breaking goes on underneath her. Since some eggs may be infertile or aborted, the peeps tell the hen how long she needs to continue sitting on the nest.
Baby chickens – Early signs of personality development
As soon as all the eggs are hatched, the hungry mother and her brood go forth eagerly to eat, drink, scratch the soil, and explore. Baby chicks are precocial, meaning they are genetically equipped to find food and follow their own kind, or whoever is in charge, in the process known as imprinting. By imprinting, chicks learn the features of their mother hen and siblings, to insure their survival. They practice hygiene by preening their feathers and dustbathing almost immediately.
Baby chickens – Communicating with mommy
The chicks venture fairly far away from their mother, communicating back and forth all the while with clucks and peeps. The hen keeps track of her little ones on the basis of color, possibly also by smell, and by counting the peeps of each chick and noting the emotional tones of their voices. Periodically she squats down, and the chicks dash under her outspread feathers where they stay until they are thoroughly warmed before dashing out again.
Should a peep be missing or sound frightened, she runs to find the chick and deliver it – not always successfully – from the hole in the ground, tangled foliage, or threatening predator.
During the first four to eight weeks or so, the chicks stay close to their mother, gathering beneath her wings every night at dusk. Eventually, she flies up to her perch, indicating her sense that they, and she, are ready for independence.
Facts about baby chickens – The first step into adulthood
Young chicks without their mother huddle together at night for the first month or two. Then one evening, you see them practicing sitting in a row, before huddling. Then comes an evening when they are lined up on their perch, arranging and rearranging themselves as before, only this time they stay lined up all night, henceforth roosting like the adults.
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KAREN DAVIS, PhD is the President and Founder of United Poultry Concerns, a nonprofit organization that promotes the compassionate and respectful treatment of domestic fowl including a sanctuary for chickens in Virginia. She is the author of Prisoned Chickens, Poisoned Eggs: An Inside Look at the Modern Poultry Industry, More Than a Meal: The Turkey in History, Myth, Ritual, and Reality, The Holocaust and the Henmaid’s Tale: A Case for Comparing Atrocities and other groundbreaking publications.
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Cover of facts about baby chickens – from incubation to independence : Courtesy of United Poultry Concerns
Thank you Dr. Davis for your insight. I am wondering about baby chicks that are born without their mothers around. I read a book a long time ago about imprinting horses. It stated there is a time frame about 24 hours after birth that they become scared of everything they come in contact with. Almost like a reverse of what happens in the first 24 hours. Is there anything like this with baby chicks?
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Dear Vegan India friends and colleagues,
Thank you very much for publishing my article on the life of a baby chicken. I hope this discussion will encourage everyone who reads it to share the article with others and choose a vegan life for the sake of the precious birds and all creatures who suffer and die needlessly for “food.”
As I write this comment, I’m listening to our roosters crowing outside in our sanctuary yard. They’re so full of vitality and exuberance, these beautiful avian souls. Choosing to be vegan, we help free chickens from a life of cruelty, fear and torment. Like us, they want to be free.
So Please: Stick Up For Chickens: Be Vegan.
Karen Davis, PhD, President
United Poultry Concerns
Dear Dr. Davis, thank you for your note. We will try our best to raise awareness about these unique avian souls who have been relegated to mere “food” to satisfy a conditioned human need. We are ever grateful to you for your insights and guidance.