In layer breeding, farmers pay the most attention to the quality of eggshells, if you have abnormal situations and start to panic, take the increase in white-shelled eggs as an example, must it be a disease? Today, Dayong will summarize with you the factors that cause the white shell eggs of the layer chicken:
Is it necessarily a disease for a chicken to lay a white-shelled egg? The seven major factors that lead to white-shelled eggs, how many have you mastered?
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The occurrence of Newcastle disease, egg loss syndrome, infectious bronchitis, E. coli disease, white crown disease and other diseases will obviously make the eggshell white. On the one hand, after the pathogen invades the chicken body, it causes pathological changes in the reproductive system, especially damage to the ovaries and fallopian tubes, edema, hyperemia or bleeding of the fallopian tubes, and shedding of the mucosal epithelium, which reduces the function of the inner glands to synthesize calcium and pigments; On the other hand, after the occurrence of disease, the chicken's feeding intake decreases, digestive function decreases, calcium and phosphorus absorption decrease, and at the same time, it will cause electrolyte loss, especially the loss of copper, zinc and manganese, which eventually causes the lack of eggshell components and the emergence of a large number of white-shell eggs. Under the premise of eliminating the cause, improve the nutritional level of feed and increase the content of vitaminS, D, E and C in an appropriate amount, which has obvious effect on improving egg color.
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Deficiencies in vitamins, minerals, calcium and phosphorus in the feed can make chickens produce white-shelled eggs. Vitamin D3 has the effect of regulating calcium and phosphorus metabolism, and its basic function is to promote the absorption of calcium and phosphorus in the intestine and increase the level of calcium and phosphorus in the serum; Vitamin C can increase thyroid activity, promote calcium and mineral metabolism, and directly or indirectly affect the quality and color of eggshells. Eggshell in the body calcification process requires carbonic anhydrase, and zinc is one of the main components of this enzyme, layer chicken zinc deficiency, carbonic anhydrase activity is reduced, high manganese will also inhibit the absorption of zinc; Usually each egg requires calcium of not less than 4.2 grams, and it is advisable to add 3%-3.5% to the diet, and the calcium content can reach 4% during the peak period. In the body, calcium and phosphorus absorption has a synergistic effect, and the appropriate amount of phosphorus can promote the absorption of calcium. At the peak of egg production, the ratio of calcium to phosphorus is 5-6:1. It is reported that low phosphorus can increase the thickness of the eggshell, which is conducive to improving the quality of the egg, and its principle has yet to be studied. Nutritional white-shell eggs, most commonly found in the early stage of laying hens, will appear a large number of white-shelled eggs, soft-skinned eggs, generally with the increase of daily age, vitamins, minerals and calcium and phosphorus supplements and gradually decrease.
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Summer festival continues to be high temperature, chicken body heat dissipation is difficult, due to chicken heat dissipation through the respiratory system, frequent breathing, so that the concentration of bicarbonate ions in the blood is reduced, thereby affecting the formation of calcium carbonate in the uterine glands, affecting the quality of the eggshell and producing white shell eggs; In autumn and winter, the temperature suddenly changes, and the chicken body cannot adapt for a while, affecting the metabolism of calcium and phosphorus, and also causing the eggshell to become lighter and whiter. Strengthening the management of chicken coop facilities, making it warm in winter and cool in summer, and creating an excellent egg-laying environment for chickens is the primary condition for avoiding the occurrence of seasonal white-shell eggs.
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Chicken coop rotation, vaccination, external disturbances, etc. will have a strong stress response to the chicken, resulting in a decline in egg laying, accompanied by whitening of color. Generally with stress elimination, management improvement, and multivitamin supplementation, the white shell egg phenomenon quickly disappears.
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In the prevention or treatment of diseases, due to the improper use of sulfonamides and other drugs, it is possible to inhibit the activity of carbonic anhydrase in chickens and the synthesis of normal eggshell pigment, so that the eggshell color fades and turns white. Caution should be exercised in the use of such drugs to avoid long-term use or excessive dosage of the drug.
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The amount of pigment deposited in the uterus affects the color of the egg, after the peak of egg production in the laying hen, with the aging of the chicken herd, its absorption rate of pigment gradually decreases, the egg color becomes lighter, and the white shell egg and the sharpie egg increase. The use of nutritional drugs for regulation can have some improvement, but the effect is not significant. According to the market situation, the chicken herd can be eliminated in time
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The light during the egg laying period should be constant, and insufficient light or unstable or irregular will produce white-shelled eggs. Providing stable and reasonable light time to the laying hens, combined with scientific feed nutrition, is a strong guarantee for maintaining the peak of egg production and improving the quality of egg color.
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