Vitamin D

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5 Terms

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Vitamin D

Calciferol

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Two most important forms

D2: Ergocalciferol - derived from ergosterol

D3: Cholecalciferol - derived from 7-dehydrocholesterol

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Sources of calciferols

-sunlight on skin

- oily fish

- egg yolk

- hay

- colostrum

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Metabolic functions:

- Promotes Ca2+ absorption from digest in gut lumen

- enhances intestinal absorption of Ca when blood Ca2+ concentration decreases

- stimulates phosphorous uptake from gut and reabsorption of Ca2+ and P from bone and kidney

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Problems associated with Vitamin D defficency

- Rickets: soft, weak, deformed bones in young growing animals

- Osteomalacia in adults: weak bones

-Poor egg shell quality and weak bones in poultry