Furthermore, the producing of an eggshell presents quite a challenge to a chicken. The blood of a laying chicken at any one time contains only 25 milligrams of calcium (non-layers and roosters have only about one-third as much), yet while producing an eggshell the chicken uses 125 milligrams per hour. Where, then, does she get this extra calcium? The original source, of course, is the food she eats, the chicken extracting the calcium from her intestines. But still she is unable to absorb calcium from this source as quickly as she needs it. So what does she do? She draws it from calcium reserves found in the 'medullary bones' located within the cavities of most of her regular bones. These secondary bones are not found in male chickens or in chickens too young or too old to lay eggs. This system is so efficient that a hen can mobilize as much as 10 percent of the total calcium in her bones in one day if her diet is very low in calcium. However, if her diet continues low, she cannot keep this up and so first compensates by laying eggs with thinner shells. If a serious shortage of calcium persists, the chicken quits laying altogether rather than laying eggs without shells. Who taught her how to grow extra bones so as to have sufficient calcium for eggshells? 1. Provide another word that can perfectly replace the following in the passage: a. Complicated b. Fascinating c. Tarries d. Snugly e. Expelled 2. How many days does it take a chicken to produce an egg? 3. Why is producing an eggshell a great challenge for the chicken? 4. What is one main difference between domestic chicken and other wild birds? 5. Provide an appropriate title for the passage.
Furthermore, the producing of an eggshell presents quite a challenge to a chicken. The blood of a laying chicken at any one time contains only 25 milligrams of calcium (non-layers and roosters have only about one-third as much), yet while producing an eggshell the chicken uses 125 milligrams per hour. Where, then, does she get this extra calcium? The original source, of course, is the food she eats, the chicken extracting the calcium from her intestines. But still she is unable to absorb calcium from this source as quickly as she needs it. So what does she do? She draws it from calcium reserves found in the 'medullary bones' located within the cavities of most of her regular bones. These secondary bones are not found in male chickens or in chickens too young or too old to lay eggs. This system is so efficient that a hen can mobilize as much as 10 percent of the total calcium in her bones in one day if her diet is very low in calcium. However, if her diet continues low, she cannot keep this up and so first compensates by laying eggs with thinner shells. If a serious shortage of calcium persists, the chicken quits laying altogether rather than laying eggs without shells. Who taught her how to grow extra bones so as to have sufficient calcium for eggshells? 1. Provide another word that can perfectly replace the following in the passage: a. Complicated b. Fascinating c. Tarries d. Snugly e. Expelled 2. How many days does it take a chicken to produce an egg? 3. Why is producing an eggshell a great challenge for the chicken? 4. What is one main difference between domestic chicken and other wild birds? 5. Provide an appropriate title for the passage.
Chapter28: Nutrition And Physical Performance
Section: Chapter Questions
Problem 15RQ
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Transcribed Image Text:Furthermore, the producing of an eggshell presents quite a challenge to a chicken. The blood of a
laying chicken at any one time contains only 25 milligrams of calcium (non-layers and roosters
have only about one-third as much), yet while producing an eggshell the chicken uses 125
milligrams per hour. Where, then, does she get this extra calcium? The original source, of course,
is the food she eats, the chicken extracting the calcium from her intestines. But still she is unable
to absorb calcium from this source as quickly as she needs it.
So what does she do? She draws it from calcium reserves found in the 'medullary bones' located
within the cavities of most of her regular bones. These secondary bones are not found in male
chickens or in chickens too young or too old to lay eggs. This system is so efficient that a hen can
mobilize as much as 10 percent of the total calcium in her bones in one day if her diet is very low
in calcium. However, if her diet continues low, she cannot keep this up and so first compensates
by laying eggs with thinner shells. If a serious shortage of calcium persists, the chicken quits laying
altogether rather than laying eggs without shells. Who taught her how to grow extra bones so as to
have sufficient calcium for eggshells?
1. Provide another word that can perfectly replace the following in the passage:
a. Complicated
b. Fascinating
C.
Таrries
d. Snugly
e. Expelled
2. How many days does it take a chicken to produce an egg?
3. Why is producing an eggshell a great challenge for the chicken?
4. What is one main difference between domestic chicken and other wild birds?
5. Provide an appropriate title for the passage,
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