The reasons why chicken lay thin eggs
When laying eggs, sometimes some eggs with thin shells will be produced, which will affect the quality of eggs. The reason for laying eggs with thin shells is related to feed, management, physiological and other factors. Prevention measures should be taken in time after occurrence.
1. Reasons from feed
Calcium deficiency: laying hens need a lot of calcium to form eggshells, calcium deficiency in the diet will produce thin shell eggs or soft eggs.When a chicken eats 100 grams to 125 grams of feed per day, it only USES 60% of the calcium in the feed.Therefore, 5%~8% of shell powder should be added to chicken feed to supplement the deficiency.
Phosphorus deficiency: phosphorus plays an important role in the formation of bones, eggshells and somatic cells in chickens, as well as in the use of carbohydrates, fats and calcium.Hens in particular need more phosphorus because the yolk contains more phosphorus.The requirement for dietary phosphorus in chickens is 0.6%, of which available phosphorus should be 0.5%.Therefore, 1%~2% bone powder or calcium phosphate should be added to the feed to supplement the deficiency of calcium and phosphorus.
Improper calcium phosphorus ratio: no matter how much or how little calcium is, it will have adverse effects on chicken health, growth and egg laying and egg shell quality.The ratio of calcium and phosphorus in general diets should be 6~8:1.If the ratio of the two is not correct, a thin or soft shell egg will be produced.As the calcification of egg shells mainly occurred in the evening before, so should appropriately extend the evening feeding time.As a result, adding seashells or bone meal to chickens every evening can improve the quality of the eggshells.
Vitamin D deficiency: even if there is sufficient calcium and phosphorus in the diet, the absorption and metabolism of calcium and phosphorus will be obstructed, resulting in small eggs, deformity, thin and soft shells, decreased egg production and hatching rate.Therefore, the most economical and effective way to obtain vitamin D is to let the chicken more sunning, make the skin and feather contain 7-deoxycholesterol, after the ultraviolet ray irradiation converts to vitamin D3 and is absorbed and utilized.Vitamin D3 is usually added to the diet during production.Using cod liver oil as vitamin D supplement and vitamin D deficiency treatment drug, can obtain satisfactory effect.
Improper use of additives: reasonable use of additives can improve the productivity and quality of eggs.However, the ingredients of all kinds of feed additives used in China are quite different at present, so it is necessary to select suitable additives according to the situation of the chicken group, and master reasonable dosage.
Feed mildew: feed mildew occurs due to poor preservation, and the liver and kidney of the chickens are damaged by aflatoxin after being fed to them, thus damaging the metabolism of vitamin D in the chickens, resulting in weight loss of the chickens, reduced feed remuneration, poor disease resistance, reduced egg production, and softening of egg shells.Therefore, feed should be properly kept to prevent damp mildew.
2. Management factors
Chicken house temperature: too high or too low can affect the quality of the egg shell.When the temperature is higher than 32 ℃, chicken body heat dissipation difficulties, loss of appetite, feed intake reduced;Long-term high temperature will disrupt the nutrient balance of the chicken body, cause metabolic changes, reduce the thyroid function of the chicken, lead to calcium deficiency in the chicken body, easy to produce thin shell or soft shell eggs.12 ℃, the temperature is below - the chicken feed intake reduces, the shell will become thinner., therefore, should be ventilation and cooling in summer and winter is warm warm, to keep within the henhouse temperature between 15 ℃ and 25 ℃, and according to the seasonally adjusted high gossypol grain concentrations of energy, protein, minerals, to improve the rate and quality of eggshell.Adding 0.5‰~1.5‰ baking soda in the feed can increase the eggshell strength and greatly reduce the thin and soft eggs.In winter, 0.5%~1.0% paprika powder is added to the daily grain to increase the heat and cold resistance of chickens and heat supply.
Poor ventilation: poor ventilation in the chicken house, resulting in excessive ammonia concentration, will cause respiratory ammonia poisoning, causing the loss of more carbon dioxide in the chicken body, resulting in the formation of calcium carbonate ions insufficient carbonate, affecting the absorption of calcium, resulting in the production of thin shell eggs.Therefore, the chicken house should be ventilated to remove feces in time to prevent excessive ammonia concentration.
3. Influence of physiological factors
Genetic factors: different breeds of chicken, the quality of eggshells, such as soil chicken eggshells are thicker, foreign varieties of eggs are thinner, easy to break.Therefore, it can be used to increase the eggshell thickness and reduce the rate of breaking eggs.
Egg laying time: general chicken farm around 8 am feed, blood calcium concentration is high in the daytime, egg chicken in the process of egg formation calcium secretion is sufficient, so generally afternoon eggshell is thicker.However, the eggs laid before 10 am are usually formed at night. At night, the hens are mostly at rest, with little food intake and low blood calcium concentration, so the eggs laid in the morning are generally thinner.
Continuous egg laying: a hen lays eggs continuously for a long time, which is easy to cause physiological deterioration and often makes the egg shell thin or soft.Therefore, improve the quality of feed, increase animal protein feed, and often sunbathe, strengthen the management of breeding, promote the recovery of physiological function of laying hens as soon as possible, to ensure the normal laying of eggs.
Thyroid dysfunction: thyroid dysfunction in chickens can seriously affect the absorption and utilization of calcium, resulting in thin or soft eggs.Three to five days of administration of thyroxine tablets will soon harden the shell.
Moulting: during the moulting, the physiological changes of the hen will be greater, which will also make the eggshell thin and increase the broken eggs.Therefore, in the moulting stage, the whole barley should be used to feed the chickens freely for 3-5 days, which can accelerate the artificial moulting, quickly recover the laying of eggs and improve the eggshell quality.
Age effect: generally older hens lay larger eggs, but their shells are correspondingly thinner.Therefore, it is advisable to feed the layers for 2 years.
4. Effects of diseases and drugs
High density of chickens, poor sanitation and shock can result in thin or soft eggs.Therefore, during the period of laying eggs, chickens should try to avoid all kinds of adverse stress factors to ensure the quality of laying eggs and improve economic efficiency.
Infectious bronchitis, new urban disease, dysentery, enteritis, and other diseases that damage the reproductive system can also cause chickens to lay eggs with thin or soft shells.In order to prevent chicken diseases, we have a lot of products,for example golden eggs is very effective for thin eggshells,and anti-bird flu,anti-Newcastle disease,Anti-gumboro disease herbal medicine,florfenicol,calcium supplement,vitamin AD3E oral solution and powder,Calcium gluconate oral solution etc.Take deworming medicine regularly and replenish nutrients such as vitamins and minerals.