In laying hens, white shell eggs often appear. What are the causes of eggshell whitening? Summarized in six aspects: seasonal, nutritional, pathological, stress, light, aging. Regardless of the cause of the eggshell color change, it is fundamentally caused by disrupted calcium metabolism in the chicken.
First, seasonal white eggshell. During the summer, when the temperature continues to be high, the chicken body is difficult to dissipate heat. In order to accelerate excretion and heat dissipation, a lot of water is consumed, and the feed intake is reduced, resulting in nutrient loss and insufficiency, affecting the quality of the eggshell and producing white shell eggs. On the occasion of autumn and winter, the temperature dropped abruptly and the chicken body could not adapt for a moment, affecting the metabolism of calcium and phosphorus, resulting in a lighter eggshell color.
Second, nutritional white eggshell. The white eggshell phenomenon can occur in chicken feed in which vitamins, minerals, and calcium and phosphorus are insufficient. The most common is at the beginning of production. In general, the hen must produce no less than 4.2 grams of calcium per egg. Layer chickens should start supplementing calcium feed two weeks before opening. The diet is suitable for 3%-3.5%, and the peak content of calcium can reach 4%. However, this limit cannot be exceeded. Vitamin D can promote the absorption of calcium in the small intestine, and vitamin C can increase the activity of the thyroid gland. Promote calcium metabolism and calcium secreted from the bone, resulting in increased plasma calcium content, thereby improving egg shell quality, improve color.
Third, pathological white eggshell. Chronic Newcastle disease, E. coli disease, Egg Drop Syndrome, Pasteurellosis, etc. will obviously make the eggshell color pale and white. In addition to this part of the changes, due to pathogens invade the reproductive system, mainly due to the disease of the flock, causing digestive disorders caused by calcium and phosphorus absorption blocked, resulting in lack of eggshell nutrition. Add vitamins A, D, E, C and amino acids in the feed, significantly improve the eggshell color effect. Of course, the first thing is to eliminate the cause.
Fourth, stress white shell. Transmigration, epidemic prevention, and external disturbance can all exert stress on chickens, resulting in decreased egg production and lightening of color. This type of change will not take long, and adjustments to the environment and drinking water to supplement electrolytic multidimensional and white egg shells will soon disappear.
Fifth, light white shell. The light during the laying period should be constant. Insufficient light or instability can cause white shell production. Artificial light supplements should be stable, with scientific feed nutrition, and ensure excellent shell color and egg production peaks.
Six, old white eggshell. Because of the aging of chickens, decreased egg production, and changes in eggshells, it is possible to improve the nutritional drugs. However, the maintenance time is not long and should be eliminated in time according to market conditions.
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