In summer, vitamin D3 should be added in appropriate amounts to laying hen feed

Vitamin D3 can promote the intestinal absorption of calcium and phosphorus and increase the levels of calcium and phosphorus in the blood, with a typical addition amount of 0.1% to 0.15%. Other studies have shown that replacing inorganic phosphorus in feed with phytase can significantly improve eggshell quality and reduce the broken egg rate; this may be because the addition of phytase reduces the content of fluorine, arsenic, cadmium, etc. contained in the inorganic phosphorus from feed in the ration, and when the levels of these elements exceed the standard, they can harm eggshell quality.