Why do chickens suffer from vitamin D deficiency

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What are the symptoms and harms of vitamin D deficiency in chickens? As we all know, vitamin D is conducive to the physical and mental health of the body, and livestock and chickens are also inseparable from the provision of vitamin D, in many cases because of the error in the feeding management method of the farm, resulting in the farm chickens can not take in sufficient vitamin D, and caused by the production of chicken vitamin D deficiency chicken disease, greatly hindering the healthy growth and development of the physical and mental health of the farm chickens, the following author will introduce the symptoms and injuries of vitamin D deficiency in chickens and chickens.

Symptoms of vitamin D deficiency in chickens

When the chicks are deficient in vitamin D, clinical symptoms can occur at the beginning of around 10 days of age, but most of them develop symptoms after 3 to 4 weeks of age. The main manifestations are stunted growth and development, messy feathers, good appetite, but weak legs, unstable posture, unwilling to walk, like to lie on the ground, beak and claws become loose, bent, deformed, kneecaps become brittle, prone to bone cracks. When adult chickens are deficient in vitamin D, symptoms generally occur after 2 to 3 months, and the early stage is mainly manifested as egg shell softening, or laying soft-shell eggs, laying eggs is reduced, and the reproduction rate of breeding eggs is significantly reduced, and the longer the history of present disease, the more serious it is.

In more severe cases, the beak, claws, and kneecaps of chickens can be soft and deformed, and the legs are weak, and they often crouch on the ground.

Chickens and poultry have poor appetite, heterophilia, stagnation of growth and development, and suffer from rickets symptoms when more severe, beak and claws become loose, tarsal joints are swollen, legs are weak, crutches, can not stand up, sleep on the side or lie down, rib bones, shoulder blades, pelvic bones, etc. are deformed, and the feathers are dull. Egg-laying female poultry lay thin-shelled eggs or soft-shell eggs, egg production and reproduction rate were significantly reduced, and test-tube embryos died after 10 to 16 days. When the sick old hen's ginseng legs are weak, it is in a "little penguin-like" crouching position, and the shoulder blades are scarred and deformed, and they are crouching on the ground.

The thyroid gland of adult birds is several times enlarged, the bones are soft and easily fractured, the bone is mainly thin, and the medial side of the shoulder blades and costal cartilage has a small spherical protrusion with limitations. The chick is a bead-spherical junction between the rib bone and the spine, the rib bone is deformed and deformed backwards, and the bone scale line of the ankle joint and femoral head is not well thickened. Articular surface soft muscles swell, and the spinal cord cavity enlarges.

Harm from vitamin D deficiency in chickens

Symptoms of rickets (a few weeks to a few months of age) or osteomalacia (adult chickens) and caged layer exhaustion can occur when the diet is deficient in vitamin D or when the chickens themselves have active hepatitis in the digestive tract.

The above is for you to sort out the chicken disease chicken vitamin D deficiency symptoms and injury content, the farm should attach great importance to the breeding management methods of the farm chickens, to train and master the corresponding breeding management methods and technical knowledge, at the same time, it is necessary to immediately do a good job in the prevention of chicken vitamin D deficiency chicken disease, and then to ensure the healthy growth of the farm chickens.

When the vitamin D deficiency of laying hens will cause the beak of the chicken to become soft, the sternum is curved, the feathers are not good, the laying hen is easy to be paralyzed, and the laying hen is prone to paralysis, laying thin shell and soft shell eggs, and the hatchability of the eggs is low.

The specific symptom is that it is easy to cause chickens to suffer from hepatitis and rickets, which affects the ability to absorb calcium, and it is also easy to lead to malnutrition, and the number of abnormal eggs will increase.

Development is stunted, the hair is not shiny, and although the appetite is good, the legs are weak, the body is unstable, and he refuses to walk.

Age-related white eggshells. Aging can also cause a decline in chicken egg production, eggshell whitening, increase nutritional drugs can improve this phenomenon to a certain extent, but the maintenance time is not long, should be eliminated in time according to the market. Epidemic prevention and external disturbance will cause the chicken to have a stress response, resulting in a decrease in egg production rate, accompanied by a lighter eggshell color.

The light during the laying period should be constant, and insufficient or unstable and irregular light will cause chickens to lay white-shell eggs.

Clinical symptoms. Initial serous, mucous or even purulent nasal discharge in sick chickens; followed by dyspnea, cough, and rales in the trachea; swelling of the eyelids and swelling of the eyeballs in the later stage; , the nodule hair committee leads to the exudation of purulent matter, sticking to the eye, and then turning into a cheese-like substance, and in severe cases, it may be bedridden for a long time, neck weakness, listlessness, etc. Calcium deficiency requires calcium supplementation.

can be fed a variety of eggshells after eating; You can also go to the pharmacy to buy some calcium tablets and feed them in chicken food; A little more sun exposure would be fine.

Basking in the sun, long-term indoor feeding of chickens, easy to cause calcium deficiency, through sun, can increase the activity of vitamin D in the chicken, increase its calcium absorption ability, can also improve calcium deficiency to a certain extent. You can eat more soybeans and soy products, which are rich in calcium. There are also dairy products, shrimp, seaweed, and some vegetables also contain a certain amount of calcium.

Also pay attention to supplementing with VD to promote calcium absorption. Sea fish, egg yolks, whole milk, animal liver are rich in VD.

It can also be supplemented with all-natural foods. For example, eat more flies, earthworms and small fish. These all help chicks to replenish calcium.

Egg shells and duck bones or chicken bones are offal and fed to chicks. In the production of general cereal feed and bran contains little calcium, the preparation of chicken diet must be added calcium feed, can supplement bone meal, eggshell powder, shell powder, stone powder and so on. 1. Don't throw away the eggshells you have eaten, dry them in the sun 2, mash the dried eggshells 3, and mix the smashed eggshells in the chicken food.

In addition to the stunted growth and development of laying hens, the main manifestations of rickets are deficient. Caged laying hens often show symptoms after 1 to 2 months of deficiency, egg production decreases, the number of thin-shelled eggs and soft-shell eggs increases, and the hatchability of eggs decreases. Sick chickens show weak legs, and some hens squat like penguins when they lay a shellless egg, and the chicken's beak, claws, and sternum become soft, and the sternum is often curved.

In chronic vitamin D deficiency, the sternum curves horizontally, and there is a well-defined spherical protrusion on the inside of the rib at the junction of the vertebral rib and vertebrae, and some ribs even break spontaneously in this area. The lumbar spine is depressed downward. Bone calcification of the tibia and femur is poor.

Parathyroid hyperplasia and hypertrophy in sick chickens.

It can mainly cause rickets, osteoporosis, decreased bone density, weakness in the legs, worrying physical condition, and prone to fractures and spasms of the hands and feet.

In fact, it will affect people's bones, and it will also cause bone deformation, teeth will not grow well, and it will also induce heart disease and intellectual development.

Lack of vitamin D can easily cause abnormal metabolism of phosphorus and calcium, and it is easy to become O-shaped legs or chicken breast shape, which can cause heart disease and affect intelligence and other hazards in severe cases.

Vitamin D, also known as anti-rickets vitamin, is a general term for several fat-soluble sterol derivatives. Its physiological function is to participate in the metabolism of calcium and phosphorus, and plays an important role in the formation and maintenance of bones and the formation of eggshells in chickens. There are two commonly used vitamin D2 and vitamin D3, and due to the high activity of the latter, its potency is 25 to 40 times higher than that of vitamin D2 in application.

When young chicks are deficient in vitamin D, they have stunted growth, loose feathers, soft beaks and claws, weak legs, and unsteady walking. The joints of the flying joints and the ribs are swollen, and the swelling of the junction between the ribs and the ribs is particularly pronounced, forming a circular nodule. The leg bones are deformed, the sternum is curved, the middle of the chest is inverted, and the ribcage becomes smaller.

When laying hens are deficient in vitamin D, they produce thin eggshells, or soft-shell eggs and deformed eggs, and egg production decreases. Some also lost weight.

The amount of vitamins needed by chickens is very small, but any vitamin deficiency will cause stunted growth, decreased production capacity, weakened disease resistance, increased mortality and other reactions, thereby affecting the economic benefits of chicken production. The main causes of vitamin deficiencies are:

1) Insufficient vitamin content in feed;

2) Vitamins are destroyed due to physical or chemical changes during storage, processing and use;

3) The feed is spoiled or contaminated by some microorganisms;

4) the feed contains certain substances that affect the absorption of vitamins or the lack of certain substances in the feed to promote the absorption of vitamins;

5) imbalance in feed nutrients;

6) Chickens have some diseases.

Other vitamin deficiencies are mainly caused by vitamin K, vitamin C, and vitamin B deficiency in the diet. The types of vitamins and the clinical symptoms of chicken deficiency are shown in Table 4.

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Table 4 Types of recyticin and symptoms of slag first bed in chickens with deficiency.

**: For a small number of seriously ill chickens, one of the following methods can be adopted**.

Feed cod liver oil drop by drop for 1 time a day, 1 2 drops a day, and use it for 3 days.

vitaminization: 10,000 IU per 1 kg of body weight, intramuscular; or per 100 kilograms, plus d3

Microcapsule 46 grams 500,000 grams of which rented units grams, mix 1 2 days stove teasing.

Vidin gum calcium 1 ml. 2 days.