AD3E

vitamin A plays an important role in the protection of the epithelial
tissues (including retina and skin) and the mucous
membranes and therefore as a protection against general
infections. Vitamin A deficiency symptoms are hyperkeratosis of
the skin, xerophthalmia, blindness, nervous symptoms, decreased
growth rates and lower fertility. Vitamin D3 takes care of the
regular process of the calcium phosphorous metabolism. It also
plays a role in increasing the rate of Ca++- absorption and transport
from the intestine and so promoting calcification of bone. Vitamin D3
deficiency symptoms are rickets in young animals and osteomalacia in
adults. Vitamin E has an anti-oxidant action. This action links vitamin E
with vitamin A metabolism (it is used for the stabilising of vitamin
A in foodstuffs), and with the unsaturated fatty acids (deficiency
symptoms are muscular disorders, e.g. White Muscle Disease, Stiff Lamb Disease).