Lack of vitamins and minerals can make eggshells turn white and pale

A deficiency of vitamins, minerals, calcium, and phosphorus in the feed can all cause hens to lay white-shelled eggs. Vitamin D3 regulates calcium and phosphorus metabolism, and its basic function is to promote the intestinal absorption of calcium and phosphorus; vitamin C can increase thyroid activity, promote the metabolism of calcium and minerals, and directly or indirectly affect eggshell quality and color. The calcification process of the eggshell in the body requires zinc-containing carbonic anhydrase. When laying hens are deficient in zinc, carbonic anhydrase activity decreases, and high manganese can also inhibit zinc absorption; usually each egg requires no less than 4.2 grams of calcium, and adding 3% to 3.5% to the diet is appropriate, with calcium content reaching 4% during the peak period.