The breed of laying hen will determine the quality of the eggs, what breed of eggs has the best qual

The eggs of the five black chickens are of the best quality, and the eggs of this breed are very rich in nutritional value and of particularly good quality.

You can choose domestic eggs, which are born from chickens that eat grain, which is relatively healthy.

It is better to choose free-range eggs. This kind of egg is basically free of chemicals, and the ingredients in it are relatively natural.

The value of native eggs is higher, because native eggs are pure and natural, and there is no feed, so the nutritional value of native eggs is higher.

It is a domestic little stupid chicken, the eggs laid by this kind of chicken have a very high nutritional value, and eggs are very nutritious for the human body.

Generally speaking, native eggs have higher nutritional value, but in fact, there is not much difference after experimental measurements, and they are all okay.

The mass of the eggs is around 60 grams.

Eggs, also known as chicken eggs and chickens, are eggs laid by the hen Huaihe. The highest content in eggs is protein, which is easily denatured when heated. Eggs contain a lot of protein, which will increase the burden on the gastrointestinal tract.

The intact eggshell is oval-shaped, with one large end and one small end, accounting for about 11% of the volume of the whole egg. Eggshells can be divided into upper shell membrane, lower shell skin, and air chamber.

The main component of the eggshell is calcium carbonate, which accounts for about 91% of the whole eggshell mass, and its calcium-containing components are the same as pearls, oysters, cow bones, and small fish fibers, which is good for calcium. In addition, the eggshell still contains about 5% magnesium carbonate, 2% calcium phosphate and gum. The shell membrane is a fibrous plasma membrane enclosed in proteins, and is a network of organic fibers composed of tough keratin.

The shell membrane is divided into two layers: the shell membrane is thicker, close to the eggshell, and is an opaque and unstructured membrane, which is used to avoid the evaporation of water from the lead vertical pienement of the egg; The inner shell membrane is about 1 3 of the thickness of the former, and adheres to the inner layer of the shell membrane, through which air can pass freely. The inner shell membrane and the shell membrane are mostly tightly bonded, and only the blunt end of the egg separates to form an air cell.

The air chamber appears only after the egg is laid, and the contraction caused by the temperature difference between the inside and outside of the body forms a gap between the shell membrane. If the water in the egg is lost, the air chamber will continue to increase; When the zygote hatches, it grows in size as the embryo develops.

To evaluate the advantages and disadvantages of a laying hen breed, of course, you can calculate the number of eggs produced, total egg weight, feed egg ratio and other indicators, but in practical work, it is very troublesome to evaluate the advantages and disadvantages of a chicken breed with many statistical items. Therefore, we introduce an economic efficiency index to facilitate the evaluation and comparison between different chicken breeds.

There are two types of calculation formulas for laying hen economic benefit index: one is the calculation of the economic benefit index when the eggs produced by different types of chicken breeds are the same; The other is the calculation of the economic benefit index when the eggs produced by different types of chicken breeds are different. They are introduced as follows:

Where: a - the total egg weight on the feeding day (kg);

b - Fertility rate (%)

c - Survival rate during egg laying (%)

d - feed-to-egg ratio;

f - the weight of the eliminated chickens (kg);

g - egg appearance** (yuan kg).

In order to illustrate the use of economic benefit index to evaluate the advantages and disadvantages of layer breeds, an example is given.

Example 1There are two chicken breeds A and B, and the eggs are all yuan kilograms; The total egg weight per day is kilograms for chicken breeds and kilograms for chicken breeds; The rearing rate is for chicken breed A and chicken breed B; The survival rate of chicken A during the laying period is that of chicken breed A and chicken breed B; The egg is more than the first chicken species, and the second chicken species is; Eliminated chickens weigh kilograms of chicken breeds and kilograms of chicken breeds.

Comparing the indices of these two breeds:

Economic benefit index of chicken breed A Chicken Breed Economic benefit index of chicken breed B =

This means that the benefits of raising chicken breed A are only times that of chicken breed B (86%); Conversely, it means that the benefits of raising chicken breed B are times higher than that of chicken breed A (116%).

Example 2The production performance data is the same as in Example 1, but the sales of eggs** are different. The eggs of chicken breed A are yuan kilograms, and the eggs of chicken breeds B are yuan kilograms.

Comparing the indices of these two breeds:

Economic benefit index of chicken breed A Chicken Breed Economic benefit index of chicken breed B =

This means that the benefits of raising chicken breed A are times that of chicken breed B (102%); Conversely, it means that the benefits of raising B chicken breed are only 98% times that of raising A chicken breed.

Eggs are divided into native eggs and foreign eggs.

Native eggs refer to the eggs laid by free-range chickens, and foreign eggs refer to the eggs laid by chickens raised on chicken farms or professional chicken households with synthetic feed. Which of these two eggs has higher nutritional value is still controversial. The content of 17 kinds of anylic acids in two eggs was scientifically determined and analyzed, and there was no obvious difference.

But now that many people are willing to buy native eggs, and it is difficult to distinguish between the two eggs, here are some experiences to tell you.

From the appearance of the eggs, the eggs are slightly smaller, the shell is slightly thinner, the color is light, and the fresher ones have a thin white film. The shell of the foreign egg is slightly thicker and darker. If you are not sure, you can open the shell after purchasing, the yolk is slightly smaller, and the golden brown is the native egg; The yolk is slightly larger and light yellow in color is a foreign egg.

After a few comparisons, you will gain experience and will be able to easily identify two different types of eggs in the future.

Natural, pollution-free, without any additives, easy to absorb.

Which is more nutritious when buying eggs, white shell or yellow shell? The chicken aunt taught me a trick and learned to earn it.