What if the egg production of laying hens decreases?

It is common that the egg production of laying hens decreases in late autumn, winter and early spring, and the reasons for the decline are complex and various. now the editor of Qiannong Network makes some analysis on the reasons for the decline of egg production of laying hens. For your reference.

Symptoms of decreased egg production in laying hens

1. The feed intake, spirit and feces of a large group are normal (we can see that the chicken crown is purple in the morning and return to normal at noon), the color and quality of the eggshell are normal, and the laying rate is reduced by about 20%.

2. At the initial stage, individual chickens swung their noses with nasal fluid (thin and transparent as water). After 1-2 days, the nasal discharge increased, individual chickens appeared grumbling sound, at this time, the feed intake began to decrease, the egg laying rate decreased faster, and the eggshell color became lighter, the eggshell quality became thinner and the egg weight became lighter.

3. The feed intake and mental health of the flock were normal, and the wilted chickens suddenly appeared. With the development of the disease, the withered chickens gradually increased, the egg production rate decreased by 20% to 30%, the eggshell quality became thinner and the eggshell color became lighter. The anatomy was often accompanied by yolk peritonitis.

4. The feed intake and mental health of the chickens were normal during the day, respiratory sounds could be heard at night, and the initial pull sound was followed by snoring (mostly near the door). The feed intake decreased and the egg laying rate decreased, and the duration could reach about a week. The quality of eggshell is poor, and soft preserved eggs and sand preserved eggs appear.

5. The feed intake and mental health of chickens are normal, the number of eggs laid in the morning is less, the number of eggs in the afternoon is increased (more in the morning and less in the afternoon), the color of eggshell becomes lighter, there are soft shells and sand skins.

6. The feed intake and mental health of the flock were normal, but the egg laying rate suddenly decreased, the decrease was small, but the range was wavy, and the eggshell color was normal.

Poor feeding and management led to a decrease in egg production

The main results are as follows: 1. The chicken flocks in the brooding stage and breeding stage are not well managed, such as too high feeding density, too crowded, slow growth, underweight, late physical and sexual maturity, late peak of egg production and egg production. During the breeding period, some chicken farmers mix male and female hens, laying hens and broilers, or even chickens of different ages together, resulting in wide disparity in strength, uneven diet and different growth speed, so the evenness of chickens is very poor. the arrival of the egg laying peak is not only slow but also maintain a high laying rate for a long time, showing an obvious decline in the laying rate in different degrees.

2. Since the beginning of winter, the external ambient temperature is very low, and the temperature difference between the inside and outside of the chicken house is relatively large. some chicken farmers only pay attention to maintaining the temperature in the chicken house, but ignore the importance of ventilation, and most of them have the problem of poor ventilation. The concentration of ammonia, carbon dioxide and hydrogen sulfide in the chicken house is very high, not only poor ventilation, relatively insufficient oxygen, but also too much harmful gas, high concentration, too long time, easy to stimulate the respiratory tract mucosa of damaged chickens. The decrease of resistance induces respiratory diseases, which in turn affects gas exchange, further deficiency of oxygen, and hinders the oxidation and decomposition process of nutrients in the body, so it affects the production performance of laying hens and reduces the laying rate.

3. Lack of light: light has a great effect on the physiological function of stimulating gonads and egg laying. Lack of light, gonadal function weakening, slow follicle formation, promote the reduction of egg production, some chicken farmers only use natural light, no light to fill light, so that the light is less than 16 hours. Although some supplement the light, but the light bulb is too few or the degree is too small, although there are 15W light bulbs, they are not covered by dust in time, and the light is not enough, which has an adverse effect on the laying rate.

4. some chicken farmers have regular and quantitative supply of feed and drinking water, and feed restrictions are carried out, but there are some problems, such as insufficient food and water, insufficient energy and protein.

5. After the peak period of egg production, the feeding was changed too quickly, and the stress reaction was large, which affected the intake, absorption and utilization of nutrients and the formation of eggs, and reduced egg production.

6. The sudden stress of chickens, such as abnormal sound, sudden shaking of light and shadow, injection of vaccines and antibodies, feeding and catching chickens, and changes in feeding procedures and environment, can also lead to the decrease of egg production rate.

In view of the problems existing in the above feeding and management, it should be solved in time, reasonable feeding, strengthen management, pay attention to feeding density should not be too large, proper ventilation and lighting and so on. In short, make the chicken live in a suitable and good environment, fully mobilize and give full play to the excellent genetic production performance.

Unreasonable preparation of feed, incomplete or unbalanced nutrients

The main results are as follows: 1. The stability of feed raw materials is poor, especially self-proportioning, which is more likely to change the production performance, such as changing premix, concentrated material or replacing soybean meal or soybean cake frequently, which affects the quality of feed and the balance of effective ingredients. It affects the absorption and utilization of nutrients and the production performance of eggs. It is proved that lysine, iron, copper, VB6, VB12 and so on should be supplemented when mixed meal is used.

2. Feed processing is not good, mixing material is uneven, some chicken farmers use "shovel" to mix materials, which can not meet the requirements of highly uniform mixing, the distribution of effective components is uneven, some chickens eat more, some chickens eat less, affecting the production performance of some chickens, egg laying rate decreased.

3. Lack of energy: when the bulk raw materials are fed to chickens with new corn, the water content of new corn is too high and the energy material is reduced. The water content of standard corn is 14%. However, the water content of new corn reaches 19-20% or even higher, and the high water content of corn, as the main energy material, is actually tantamount to reducing energy material, resulting in insufficient energy and insufficient energy, so the cold weather and insufficient feed energy in winter can reduce the laying rate, because the energy obtained by the chicken body can only pay for the energy needed for laying eggs in addition to removing the energy needed for chicken life activities. If there is not enough energy, there will be fewer eggs.

4. As the price of eggs produced by laying hens is not high and the market is depressed, some chicken farmers excessively pursue to reduce costs, try to save money, choose unqualified feed or raw materials of poor quality, and have incomplete nutrients. Protein, vitamins, trace elements and other deficiencies, especially in the breeding period, there is no good feeding, so that the chicken growth and development is poor, poor physique, low resistance. The excellent genetic production performance can not be brought into full play, so that the production performance of chickens is poor during the laying period, the laying rate is not high or unstable, and the laying rate decreases.

5. Some chicken farmers have enteritis, diarrhea or poisoning due to the use of moldy and deteriorated feed, which contains a large amount of bacteria, toxins and denatured proteins, resulting in digestive disorders and absorption disorders, which will also become one of the reasons for the decline of egg production rate.

The problems existing in the above feed preparation must be solved in time, according to the scientific feed formula, selecting high-quality raw materials and reasonable preparation, so that chickens can eat full-price feed that meets the nutritional needs and live in a suitable environment. Constantly mobilize, give full play to, improve and maintain good production performance.

The wrong use of drugs in laying hens leads to a decrease in egg production.

After the attack of laying hens, improper treatment, wrong medication, and the use of sulfonamides, tetracyclines and neomycin drugs which are prohibited by laying hens will cause damage to the body, inhibit reproductive function, reduce egg production and decrease the laying rate.

A decline in egg production due to the interference of disease

Due to seasonal changes, the general climate temperature is too low, some chicken farmers do not deal well with the contradiction between heat preservation and ventilation in winter, and there is the problem of poor ventilation. The environment in the chicken house is very poor, and respiratory diseases are easy to occur, such as infectious rhinitis, infectious laryngotracheitis, mycosis and so on, which can lead to the decrease of laying rate in varying degrees. When causing a sudden decline in the laying rate, the interference of the following infectious diseases should also be considered:

1. Newcastle disease

[diagnostic methods] it is more common in production, which mostly occurs in chickens that have not been immunized for a long time or whose immune effect is poor or failed, the feed intake decreases (10-20%) and the laying rate decreases (20-30%). The quality of eggs decreased, the eggshell became white and thin, the number of deformed eggs increased, green and sparse stools were discharged, and some had neurological symptoms. Pathological examination showed that there were characteristic lesions of the virus in the gastrointestinal tract.

[prevention and control measures] Comprehensive prevention and control measures can be implemented for diseased chickens. Such as emergency immunization, strengthen disinfection management, use antiviral drugs such as Likening, duke No. 1, ketotele, and antiseptic agents such as special killer, ciprofloxacin, anrofloxacin, doxycycline, etc., supplement nutrition (increase the dosage of Jinvita), improve the disease resistance of the body, and so on.

2. Avian influenza

[diagnostic methods] sometimes showed endemic prevalence, decreased feed intake and laying rate of diseased chickens (30-60%), depressed spirit, purple crown, edema of crown, eyelids and meat beard, purple-black bleeding spots on leg scales, different degrees of respiratory symptoms, tracheal ring with a lot of mucus, green feces, glandular stomach nipple bleeding or a large amount of mucus, myogastric cornea easy to peel off, intestinal flake or strip bleeding. Oviduct edema, purulent substance, follicular deformation, bleeding, easy to rupture. Kidney swelling, massive bleeding. Hepatomegaly, often accompanied by steatosis or rupture and bleeding.

[prevention and control measures] take comprehensive prevention and control of diseased chickens, strengthen feeding and management, do a good job in isolation and disinfection, improve body resistance, reduce stress and prevent other diseased diseases. To carry out the necessary drug treatment to reduce production losses, large groups can use Banlangen granules, antiviral drugs (Likening of Shannong University Pharmaceutical Company, ketotele or virazole, ribavirin) to drink water or mix ingredients. Drugs such as amantadine VC and doxycycline can also be used to reduce death and prevent secondary disease. In the later stage of the disease, Golden Vitamin or Golden Egg Powder can be used to promote the resumption of egg production.

3. Infectious bronchitis

[diagnostic method] the respiratory symptoms of adult chickens were obvious, but the laying rate decreased significantly, and the serious ones could be reduced by half. Laying abnormal eggs, thin-shell eggs, faded eggs, thin egg whites, yolk and protein separation. Egg production usually resumes gradually after 10 days. Variant infectious bronchitis of laying hens, caused by coronavirus, occurs in laying hens and breaks out at more than 200 days of age. The disease is closely related to stress, and all kinds of strong stress can induce the disease. In the initial stage, the diseased chickens had respiratory symptoms dominated by "snoring"; when there was no mixed infection, there was no cough or nose swinging, the respiratory symptoms lasted about 5-7 days, and the feed intake decreased by 5-20%. Faeces become soft or pull water-like faeces.

After the onset of disease in the new ① chickens, the egg production increased slowly or stagnated or decreased. After rehabilitation, it reached the original level.

The egg production of ② fluctuated 1-2 days before the onset of the disease, and decreased rapidly 2-3 days later, generally by 20-25%. After recovery, it also reached the original level.

After the onset of ③ in old age, the laying rate decreased rapidly and recovered slowly. At the same time of the decline in egg production, the egg quality decreased, the eggshell surface was rough, the eggshell became thinner, the color became white, the egg weight was small, and there were many abnormal eggs, accounting for about 510% of the abnormal eggs.

[prevention and treatment measures] there is no specific therapy for the prevention and treatment of the disease, because the disease is closely related to stress, we can only try our best to reduce stress, strengthen feeding management, disinfection and immunization in advance. At the age of 120 days, a quadruple vaccine with full ND+EDS76+IB+ variants can be injected to control the incidence and epidemic of the disease.

4. Egg drop syndrome

[diagnostic method] Egg drop syndrome, also known as egg drop syndrome, is a viral infectious disease of young hens, and brown shell hens are the most susceptible. The characteristic change is that the laying hens can not reach the laying peak on time or the laying rate decreases greatly. The decline in egg production usually occurs at the age of 24-36 weeks, and the laying rate decreases by 20-30%, or even 50%. Abnormal eggs, such as white shell eggs, thin shell eggs, soft shell eggs, unshelled eggs and deformed eggs, the egg yolk is watery, and sometimes the egg yolk is mixed with blood, etc., and the egg production can be recovered after a continuous decline of 4-10. The egg laying suddenly decreased and the abnormal eggs increased, especially the brown shell hat chicken appeared eggshell fading, eggshell thinning and brittleness 1-2 days after egg laying, which could make a preliminary diagnosis and further laboratory diagnosis if necessary.

[prevention and control measures] strengthening management and immunization can be adopted. The oil vaccine of egg drop syndrome is generally injected 20 days or 120 days before laying, which can be well protected during the whole laying period.

5. Chicken encephalomyelitis

[diagnostic methods] all kinds of laying hens and broilers can be infected and can occur in all seasons of the year, but it occurs frequently in spring and winter. The spirit, food intake, drinking water and feces of diseased chickens were basically normal, and the feeding intake of individual chickens decreased by 5-10% during the onset period. It mainly showed that the egg laying rate decreased, and there was no significant change in egg size, shape, color and eggshell thickness. The egg production of chicken flocks takes about 5-15 days from decline to recovery, and there is a great difference in the range of egg production decline. after the onset of the disease in the peak period and near the peak period, the egg production decreases greatly, and the egg production in the peak age flocks decreases slightly, generally between 10-40%.

[prevention and treatment measures] there is no special treatment for this disease. It is necessary to add Likening, ketotele, virulent and Banlangen granules in drinking water to increase the amount of vitamins. The best way is to be vaccinated. Combine attenuated vaccine with oil vaccine. At the age of 70-100 days, young chickens were immunized with attenuated vaccine (because the use of attenuated vaccine during the laying period can lead to a decrease in egg production). Oil vaccine can be injected subcutaneously or intramuscularly 20 days before production, and immune protection can be produced after 15-20 days.