What is the reason for the sudden decline in egg production of laying hens

Under the normal feeding management conditions, the egg production of improved breed laying hens has a certain regularity. After seeing eggs, the egg laying rate rises rapidly; Within 3 to 4 weeks after the egg production rate reaches 50% (i.e. the group starts to lay), the peak of egg production begins; After a certain amount of time, it slowly declines. In actual production, often due to improper feeding, disease infection and other factors, the egg production of chickens suddenly declines, resulting in large economic losses.

To avoid this from happening, it is important for breeders to understand the various causes of a sudden drop in egg production and to take precautions as early as possible. There are many reasons for the decline in egg laying rate, which are summarized in Table 21.

Table 21 Causes and prevention of declining egg laying rate.

Table 21 Causes and prevention of declining egg laying rate (continued)-1

Table 21 Causes and prevention of declining egg laying rate (continued)-2

The decline in egg production of laying hens is the first to find the reason for the decline in egg production of laying hens, in order to carry out healthy breeding and preventive health care, it is possible to avoid the occurrence of multi-pathogenic infection. When it is found that the egg production of the flock suddenly declines, measures should be taken to give priority to prevention and combine prevention and control. So what are the reasons for the decline in egg production in chickens?

First, the environmental laying hens are very strong to environmental stress, especially light, temperature, ventilation is the most obvious.

Light, such as the chicken house suddenly stop the light, shorten the light time, reduce the light intensity, etc., can make the egg production suddenly decrease, especially in the countryside often power outages, and there is no backup lighting equipment, the impact is more serious.

Temperature, sudden increase or decrease in temperature, such as continuous hot weather in summer, the formation of a high temperature environment in the house, or a sudden cold snap, will cause a general decrease in feed intake and egg production.

Poor ventilation, turbid air in the house, and too strong ammonia smell can also lead to a decrease in egg production.

Second, poor management is also an important factor leading to the sudden decline in egg production of chickens, mainly manifested in.

Feeding management procedures are not standardized, such as more feed and less meals, drinking water can not be satisfied, and changing operating procedures at will can lead to a sudden decline in egg production.

Equipment damage, such as blocked pipes, water supply obstructions caused by untimely maintenance, unobstructed ventilation equipment such as electric fans, or failure and failure of ventilation equipment such as electric fans.

Abnormal sounds, the presence of strangers, livestock, and stress on the flock such as vaccinations or deworming** will not only cause a sudden drop in egg production, but also increase the number of deformed, soft-shelled and broken eggs.

3. There are many diseases that cause a decline in egg production, among which the invasion of infectious diseases is particularly obvious. There are two main types of infectious diseases that can cause a sudden drop in egg production in a flock.

Viral infectious diseases. There are infectious bronchitis, Newcastle disease, infectious laryngotracheitis, declining egg production syndrome, infectious encephalomyelitis, lymphoid leukemia and chicken pox, etc. If the virulent Newcastle disease is invaded, the egg production rate of the flock can suddenly drop from 70 90% to 20 40; There have also been cases of mild Newcastle disease in flocks causing a sudden drop in egg production by 20 40.

Bacterial infectious diseases. The main ones are Escherichia coliformosis, septicaemia mycoplasmosis, infectious rhinitis and avian cholera.

Fourth, others mainly include the same period of laying hens or overdose of drugs. In a relatively stable state of egg production, if there is a sudden increase in the number of chickens that are off on a given day, there will be a sudden decline in egg production, but this phenomenon will generally return to the original egg production level in a very short period of time. Cases of overdose, chicken poisoning, or significant effects on egg production are also common.

Prevention method: the use of Tianyu's Gankang polypeptide, each set can be injected with 1000 adult birds, 2000 first birds, generally injected once, can improve chicken immunity, improve chicken disease resistance, effectively reduce the decline of chicken egg production.

Management reasons (1) Temperature, humidity, ventilation and other management aspects are unreasonable, resulting in a decline in the egg production rate of laying hens. (2) Frightened by various external stresses such as man-made, resulting in a decrease in egg production rate. (3) Insufficient drinking water or feed intake will also cause a decrease in egg production performance.

4) The nutrient ratio is unreasonable, and feed mildew will also lead to a decrease in the egg production rate of laying hens. (5) The lighting is unreasonable. 2. Causes of diseases (1) Some nutritional and metabolic diseases cause a decline in the egg production rate of laying hens.

2) If the laying hen suffers from influenza, Newcastle disease, branching, egg loss syndrome and other diseases, then the egg production rate will also decrease. (4) If the laying hen suffers from nematode, coccidiosis and other parasitic diseases, the egg production rate will decrease to a certain extent. (5) Impaired liver and kidney function of egg shells will also lead to a decrease in egg production rate.

To raise laying hens, it is very important to raise the intestines. Because intestinal diseases of laying hens will not only affect the healthy growth of chickens, but also seriously affect the egg production status and directly damage chicken farms.

How to have a chicken liver and a big spleen**?

Chicken hepatic splenomegaly (BLS), also known as chicken hepatitis splenomegaly syndrome, is an infectious disease characterized by hepatosplenomegaly in laying hens and broilers caused by avian hepatitis E virus. The disease mainly causes a 20%-40% decrease in egg production and an increase in the mortality rate of laying hens and broiler breeders aged 30-72 weeks. Dalong Daganning can be used for hepatosplenomegaly, liver rupture and bleeding caused by drugs, toxins and other reasons in egg poultry or breeding birds, which is effective in 1 day and controls death in 2 days.

What are intestinal diseases in laying hens?

There are many intestinal diseases in laying hens, such as diarrhea, E. coli, salmonella, staphylococcus, streptococcal disease, etc. Among them, laying hens are divided into metabolic diarrhea, bacterial diarrhea, virus diarrhea, parasite diarrhea, poisoning diarrhea, physiological diarrhea, environmental diarrhea, fungal diarrhea, and nutritional diarrhea.

How about intestinal diseases in laying hens**?

When intestinal diseases occur in laying hens, the first thing to diagnose and confirm which intestinal diseases the chickens have, and the symptoms can achieve good results.

1.Egg diarrhea.

As mentioned above, egg diarrhea is divided into many types, and when egg diarrhea needs to be diagnosed, it can be.

1) Physiological diarrhea.

First of all, it is necessary to adjust the feed and adjust the feed reasonably. The content of protein and crude fiber in the feed of laying hens should be appropriately reduced, the content of vitamins should be appropriately increased, and the intestinal tract of laying hens should be supplemented with beneficial bacteria.

2) Disease diarrhea.

**There are many drugs for this disease, and the choice of drugs should be based on the actual situation of sick chickens in the chicken farm. In addition, in terms of dosage, course of treatment and drug combination, it is carried out scientifically to avoid blind medication and delay the disease.

Here are a few prominent common questions for reference:

Stress factors caused by the environment (including climate, air, water, noise, and changing breeders). The decline in the laying rate of laying hens caused by this factor is sudden, but the stress factor does not subside, and this low egg production rate will continue to exist.

Exclusion of infectious factors. This condition does not come as suddenly as a stress reaction, but develops gradually in a short period of time, accompanied by obvious symptoms of infection, and here special attention should be paid to the problem of parasites, which are more insidious.

Exclude factors such as improper feed or improper changes. Feed is the basis for high yield provided to laying hens, and it is impossible to achieve high yield without scientific formulas.

It is a normal phenomenon for laying hens to produce their own laws.

The first laying cycle of egg-laying chickens is about 1 year, and the whole process can be divided into three stages: pre-laying, peak and late-laying. According to the laying period, the average weekly laying rate is a parabolic curve rather than a straight line.

From the beginning of laying to the end of 80 weeks, usually from the beginning of 21 weeks of age to the end of 28 weeks of age (the number of breeds of chickens has moved forward to 19 to 23 weeks of age).

When the egg production rate of the flock rises to 80, it is the peak of egg production. The 80 ovilet rate still rises rapidly at its peak, usually rising to 92 to 95 in 3 to 4 weeks. The laying rate above 90 can generally last for 10 to 20 weeks, and then slowly decline.

When the laying rate drops below 80, the peak laying season is over. The peak period of modern egg varieties usually lasts for about 6 months.

At 72 weeks, the egg laying rate remains around 65. The period from the average weekly egg laying rate below 80 to the culling of the flock is called the late laying period, which usually refers to the age of 60 to 72 weeks. The decrease in the average weekly egg production rate in the late laying period was larger than that in the peak period.

Temperature is one of the important environmental factors in the management of laying hens, the temperature will not only cause changes in chicken feed intake, but also will cause many aspects of chicken physiology, such as the secretion of thyroid hormone, the level of luteinizing hormone in the blood, etc., these factors will affect the metabolic rate of chickens and the real-time discharge of eggs, thereby affecting the egg production performance of chickens. Therefore, keeping the house in the right temperature range is very important to keep the chickens at a high level of egg production and save feed.

The reason is that when the weather gets colder, the hen's desire to lay eggs will decrease, so just keep warm.

Because of old age. Some chickens are older and can't lay eggs.

There are a number of reasons for a sudden drop in egg production.

First, feed factors.

Laying hens have high requirements for feed nutrition. Problems with the feed often lead to a sudden drop in egg production.

1.Feed quality is poor. Feed mildew or contamination leads to a decrease in feed palatability, a decrease in feed intake of chickens, and a sudden drop in egg production rate due to gastrointestinal diseases.

2.Improper ratio of calcium and phosphorus. The ratio of calcium and phosphorus is out of balance, which affects the formation of eggshells and eggs.

3.Nutritional deficiencies. Insufficient content of vitamins or trace elements is also an important factor, such as vitamin D3, vitamin E, deficiency of trace elements SE and MN.

4.Feed mutations. Sudden change of feed, resulting in the chicken's digestive function can not adapt to the change for a while and indigestion occurs.

Second, environmental factors.

Laying hens are very sensitive to changes in the environment, with changes in light, temperature and ventilation being the most obvious.

1.Lack of light and filial piety. If the chicken coop suddenly stops light, the light time is shortened, and the light intensity is reduced, etc., the egg production can suddenly decline, and some rural areas often have power outages, and the skin width lacks the proper lighting equipment, and the impact is more serious.

2.Sudden changes in temperature. Sudden increases or decreases in temperature, such as continuous hot weather in summer, the formation of a high temperature environment in the house, and a sudden cold snap in winter, will cause a general decline in feed intake and egg production.

3.Poor ventilation. The air in the house is polluted and the smell of ammonia is too strong, which can induce respiratory diseases and cause a sudden drop in egg production.

3. Management factors.

Poor management is also an important factor in the sudden decline in egg production in the flock, mainly in the following ways:

1.Feeding is irregular and not quantitative. For example, one more meal of feed, one less meal, drinking water can not be full of demand, and random rational operating procedures can lead to a sudden drop in egg production.

2.The device is damaged. For example, the water supply pipeline is blocked, the maintenance is not timely and the water supply is blocked, and the ventilation equipment such as electric fans is faulty and not repaired in time.

Fourth, the disease ** element.

Large liver and spleen disease: natural infection is mainly seen in chickens over 18 weeks old, especially in 30-72 weeks old laying hens are the most susceptible, 40-50 weeks old laying hens have the highest incidence, mortality increased by about 1%. Infected chickens have poor breeding, large individual differences, delayed laying hens, no peak egg production or laying hen egg production rate decreased by 20%-40%, egg quality declined, eggshells faded and thinned, and the volume became smaller.

Dalong Daganning can be used to treat the enlargement of the spleen and glandular stomach caused by the large liver and spleen of broilers, and the egg production of broilers can be reduced, and the egg production rate of broiler hens can be improved.