Broilers have breast muscles which are too big for their bones to support, leading to lameness.

肉鸡的胸肌太大，骨头无法支撑，导致跛足。

In fact, vitamin D promotes heart, metabolic, and immune system health in addition to supporting bone health.

事实上，维生素 D 除了有益骨骼健康外，还对心脏、新陈代谢和免疫系统健康有益。