What to do if the eggshell has thinned and the shell has weakened

The density and thickness of the shell is one of the most important indicators of egg quality. At industrial facilities, there is a special control system that includes a number of measurements indicating the quality of the product. This is due to the fact that the thin shell of eggs reduces their price, as they become unsafe for the consumer.

Thin and weak eggshell

Factors determining the thickness of the shell, in fact, a lot. In some cases, chickens do not receive a sufficient amount of certain substances, and in others, individuals can be sick. Shell quality control can help to preserve not only eggs, but also the health of laying hens. The thinnest shell is in quail eggs.

Causes of thinning eggshell

In fact, the factors determining the thickness and strength of the shell in the eggs are quite diverse. So, these parameters can be excellent in different breeds and crosses of chickens, however, under normal conditions, the contents of chicken eggs will still be qualitatively protected regardless of the species of bird, therefore, first of all, we should talk about pathological changes.

You must understand that the shell is a rather complex product, the creation of which requires certain resources. 3 nutrient macronutrients are spent on the formation of the egg shell:

  • nitrogen;
  • calcium;
  • phosphorus.

However, one should not neglect trace elements, the content of which in the body of the bird is much lower than the previous ones, otherwise they will not be in the eggs either. The contribution of these chemical elements is significant, therefore, it is necessary to carefully monitor that they also fall into the diet of chickens.

In total, 6 trace elements are distinguished that affect the formation of the eggshell: zinc, cobalt, cuprum, ferum, manganese and iodine. Without these substances, the formation of a full-fledged shell is impossible.

What triggers the thinning of the shell

Typically, the reason that a weak egg shell has appeared is due to a lack of the above chemical elements. Among other things, vitamin D, which may also be called the “sunshine” vitamin, is of great importance in this context. It is very necessary for the assimilation of macro- and microelements.

The lack of vitamin D leads to the fact that the bird is not able to use the elements obtained from food. This can ultimately affect not only the eggs, but also the health of adult birds, leading to the development of a number of diseases, especially rickets and bone diseases.

However, the most common reason lies in the wrong ratio of phosphorus and calcium. Normally, chickens normally need to get 3-5 times more Ca than P. Besides, the lack of calcium affects the development of osteoporosis.


When it becomes known why a soft shell is observed, one can begin to think about what to do with it. It is necessary to ensure that the chickens are provided with the right amount of macro-, microelements and the aforementioned vitamin D. To do this, you can include the following products in the diet:

  1. To increase the amount of calcium received, egg shells, limestone, chalk, cottage cheese, oven ash, limestone and shell lime are ground into powder.
  2. If you want to increase the amount of both calcium and phosphorus, bone meal and phosphates containing Ca are perfect.
  3. The main source of nitrogen is salt.

However, the latter must be extremely careful. Large particles of salt, as well as its excess, can lead to chicken poisoning and death. In the summer, it is desirable to be limited to nitrogen obtained from herbaceous plants: clover, sorrel, plantain, meadow bluegrass and dandelion.

Regarding calcium, it must be said that about 2.1-2.3 g of this element is usually spent on the formation of the shell and its contents.

But it must be borne in mind that chicken is able to use only up to 50% of the resulting calcium, which is why the above value needs to be doubled. So that a very thin shell is strengthened, the bird should receive from 4.4 to 4.6 g of this macrocell per day.

How and when to introduce lure to strengthen the shell

Feeding calcium-rich foods is recommended after lunch. This will allow chickens to optimally consume the element, taking into account physiological needs.

Moreover, for the shell to be strong, it is advisable to feed limestone in the morning to the chickens, and after lunch, at about 14-15 hours, shell rock. This is due to the fact that the last product, entering the body, is retained in the gastrointestinal tract for a longer period than limestone.

However, in some cases, a fragile shell is just one of the symptoms of a certain disease. In such a situation, it is hardly possible to strengthen it without curing the bird. First, it is recommended to make sure that chickens do not suffer from the following diseases, because the shell nuisance carries them:

  • mycoplasmosis;
  • infectious bronchitis;
  • NB;
  • bird flu;
  • SSA;
  • bird encephalomyelitis.

Among other things, care must be taken to ensure that poultry do not have any mental problems. Stress and fright, like diseases, can contribute to poor bird health, which in turn leads to thinning of the eggshell. Without a quiet life, it will be extremely difficult to strengthen the shell.

Feeding birds properly and monitoring their health is wonderful, but this may not be enough if you don't have enough vitamin D. It’s not for nothing that they called it “sunny.” The fact is that it is usually synthesized, thanks to the rays falling on the body. To avoid deficiency and prevent a defect in the eggs, it is necessary to give chickens the opportunity to walk in the summer under the sun. If the problem arose in the winter, it is recommended to give chickens special vitamin-containing preparations: trivitamin and tetravit.


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