Calcium availability is a major component that can affect eggshell quality in layers. Both
an excess and a deficiency of calcium will negatively affect shell quality. Excess calcium will
decrease phosphorus availability and reduce feed intake, which will affect shell quality, as well
as egg production. Calcium deficiency will also affect shell quality and tends to deplete the
calcium content of the bone, which can lead to brittle bones and fractures or Cage Layer Fatigue.