| The organism animal synthesizes it from the ultra-violet rays, so its very important of the sun in the loft. | |
| Action: | Its fundamental action is to promote the absorption and fixation of calcium and phosphorus in the skeleton. |
| Deficiency: | Deformation of the breastbone. Fragile bones. Eggs with thin and soft rind. Fragile peak and soft nails. Delay of the growth. Problems in the plumage. A prolonged deficiency leads to the ” raquitismo ” (rháchîtis = to meager) |