With so much calcium in egg shells, how do chickens get this calcium? Isn t it deficient in calcium?

You must be a city kid, right?!

I grew up in the countryside, and I still know the life of chickens, ducks and geese, in the countryside, the farmers' chickens, ducks and geese are usually stocked in the wild, and they are outside all day long with their paws to eat, and of course they will be fed at home. When you slaughter them, you will find that they have a lot of pebbles in their stomachs and other things, which are used to help them digest and replenish calcium.

You will definitely ask, now that the chickens, ducks and geese in those farms are locked in cages every day, where do they get so many pebbles to eat?

The problem lies in the current feed, which contains many ingredients, one of which is bone meal.

Bone meal is the powder made from the bones of various animals, and I don't know what kind of animal the bones are and where they come from!

Now you know where their calcium comes from?!

Chickens rely on humans to provide it with full-price compound feed to supplement calcium, and it also has a calcium deficiency, that is, when there is not enough calcium in the feed provided, or when some drugs are used to hinder the body's absorption of calcium, chickens will be deficient in calcium. This refers to the flock of chickens raised in captivity, and the free-range ones on the ground will not have a calcium deficiency, because the soil contains calcium, because of instinct, the chickens themselves know where to go to supplement calcium.

Contain. Each 100 grams of eggs contain grams of protein, mainly ovalbumin and ovoglobulin, which contain 8 kinds of essential amino acids for the human body, and the composition of human protein is very similar, and the absorption rate of egg protein by the human body can be as high as 98%.

Each 100 grams of eggs contain 11 15 grams of fat, mainly concentrated in the egg yolk, but also very easy to be digested and absorbed by the human body, the egg yolk is rich in lecithin, sterols, egg lutein and calcium, phosphorus, iron, vitamin A, vitamin D and B vitamins.

Tips for buying eggs:

After purchasing eggs, consumers should first select cracked or damaged eggs, and gently wipe the dirt on the surface of the eggshell with a clean cloth or paper for the intact eggs.

Then, refrigerate the eggs with their small heads down and large heads up. In spring and autumn, you can spread some sawdust, sawdust, fine sand, rice bran, and rice in the container where the eggs are stored, and store the eggs vertically with the small ends facing down, and store them in a cool place.

Eggs can be stored in the refrigerator for up to 40 days, and generally 10-15 days at room temperature. If it is stored for too long, not only will the freshness and nutrients of the eggs be affected, but also the deterioration will occur due to the invasion of bacteria, and the phenomenon of sticky shell and yellowing will appear.

The above content reference: Encyclopedia - eggs.

An egg contains about 25mg of calcium, and also contains 8 kinds of essential amino acids, and the composition of human protein is very similar, and the absorption rate of egg protein by the human body can be as high as 98%.

An egg contains as many calories as half an apple or half a cup of milk, but it also contains 8% of the phosphorus, 4% of the zinc, 4% of the iron, 6% of the protein, 6% of the vitamin D, 3% of the vitamin E, 6% of the vitamin A, 2% of the vitamin B, 5% of the vitamin B and the 5% vitamin B6.

The method for determining the calcium content in the egg shell is as follows:

Method 1: EDTA titration

1. Dissolution of egg shell: Take an egg shell to wash and remove the inner membrane, dry, grind and weigh its mass, then put it into a small beaker, add 10ml of 6mol L HCl, heat it slightly to dissolve it, and then transfer the solution in the small beaker to a 250ml volumetric flask, and shake it well.

2. Calibration of EDTA standard solution: the configuration of EDTA standard solution with concentration: weigh grams of EDTA disodium salt, dissolve it in 150 200ml of warm deionized water, add it to the reagent bottle after cooling, dilute it to 500ml, and shake well.

The configuration of zinc standard solution: accurately weigh grams of pure ZNO solid reagent for analysis, place it in a 100ml small beaker, first wet it with a small amount of deionized water, then add 2ml of 6mol L HCl solution, and gently stir it with a glass rod to dissolve it.

Quantitatively transfer the solution to a 250 ml volumetric flask, dilute to the engraved line with deionized water, and shake well. The concentration of the zinc ion standard solution is calculated based on the weight of the zNO.

Calibration of EDTA standard solution: Pipette zinc ion standard solution, sing in a 250ml small beaker, add 1 2 drops of xylenol orange indicator, add 20% hexamethylenetetramine solution dropwise until the solution is stable purple-red, and then add 2ml; The standard solution was then titrated with C(EDTA)= until the solution changed from purplish-red to bright yellow as the endpoint, and the volume of EDTA solution consumed was recorded.

Repeat the titration 3 times according to the above method, the required range is less than that, and calculate its exact concentration according to the volume of EDTA solution consumed during calibration. Titration of Ca2+: Pipette the solution to be measured in an Erlenmeyer flask, adjust the pH > of the solution, shake well, add 5 drops of calcium indicator, titrate with EDTA standard solution until the solution changes from burgundy to pure blue as the end point, repeat the titration 3 times, and record the volume of EDTA solution consumed.

Method 2 Determination of calcium content by atomic absorption spectrophotometry

a.Equipped with calcium standard solution series for accurate pipetting0ml calcium standard use tuck, respectively placed in 25ml volumetric flasks, diluted with deionized water to the engraved line, shaken well for later use.

b.Configure the sample solution Accurately pipette the calcium ion solution in the volumetric flask into a 25ml volumetric flask, dilute it with water to the scale, shake it well, and set aside. c.

Measured with an atomic absorption spectrophotometer The calcium in the sample was obtained by the calcium standard working curve.

Eggs are not high in calcium. 100 grams of eggs contain about 44 mg of calcium. Calcium is mainly found on the shell of the egg.

Brain Strengthening. The lecithin, triglycerides, cholesterol and vitelline in egg yolk have a great effect on the nervous system and physical development. When lecithin is digested by the body, it releases choline, which improves memory in all age groups.

Protects the liver. The protein in eggs has a repairing effect on liver tissue damage. The lecithin in egg yolk promotes the regeneration of liver cells. It can also increase the amount of plasma protein in the human body and enhance the body's metabolic function and immune function.

Prevention and treatment of arteriosclerosis.

American nutritionists and medical workers use eggs to prevent and treat atherosclerosis, and have achieved surprising results, they extract lecithin from eggs, walnuts, and pork liver, and give 4-6 tablespoons a day to cardiovascular patients. After 3 months, the patient's serum cholesterol decreased significantly and satisfactory results were obtained.

Prevent cancer. Eggs contain more vitamin B2, which can break down and oxidize carcinogens in the human body. The trace elements in eggs, such as selenium and zinc, also have anti-cancer effects. Based on an analysis of human cancer mortality worldwide, it was found that cancer mortality is inversely proportional to selenium intake.

Methods for determining calcium content in egg shells include EDTA titration and atomic absorption spectrophotometry.

EDTA calibration principle: zinc oxide as the benchmark standard EDTA condition is to use xylenol orange deficiency as an indicator, pH = 5-6 six times methyltetramine as a buffer solution.

Principle of Atomic Absorption Spectrophotometry Determination of Calcium Ions: Atomic Absorption Spectrophotometry is the light emitted by the hollow cathode lamp of the element to be measured with characteristic spectral lines of a certain intensity and a certain wavelength. When it passes through the flame containing the vapor of the ground state atom of the element to be measured, the light of part of the characteristic spectral line is absorbed, and the unabsorbed light is irradiated to the photoelectric detector through the monochromator, and the content of the element to be measured in the sample can be obtained by detecting the magnitude of the light intensity of the characteristic spectral line.