Vitamins Flashcards
important B vitamins
thiamin
riboflavin
niacin
cobalamin
folacin
what is the active form of vitamin A
11-cis retinol
function of vitamin A
-synthesis of rhodopsin(light receptor pigment)
-proper function of epithelia, nervous tissue
-b-keratine is an antioxidant
what is b-karatine high in
leaves of forages and other carotenoids(carrots)
T/F b-karatine is readily converted to vitamin A
FALSE
T/F retinol is not naturally present in equine diets
TRUE
where is vitamin A stored?
how long can it last?
stored in liver for 3-6 months
symptoms of vitamin A deficiency
night blindness
how can vitamin A toxicity be achieved
only with supplementation
active form of vitamin D
25-hydroxy vitamin D
function of vitamin D
maintain Ca status and regulate its absorption
source of vitamin D
7-dehydrocholesterol is converted to vitamin D upon UV exposure
Sun cured plants(ergocalciferol)
D2 supplement
where is vitamin D stored?
how long can it last?
stored in bone and GIT
lasts 6-8 weeks
symptoms of vitamin D deficiency
rickets or osteomalacia
causes of vitamin D deficiency
-supplementation
-cumulative
-excessive Ca absorption and deposits
active form of vitamin E
a tocopherol
function of vitamin E
antioxidant
immune system
DNA synthesis
cellular respiration
muscle integrity
sources of vitamin E
forages and oil seeds
bioavailability of synthetic forms of vitamin E
74% of natural forms
how long is vitamin E stored in the body
3-7 weeks
symptoms of vitamin E deficiency
-white muscle disease in foals
-yellow fat disease
-equine degenerative myeloencephalopathy
T/F vitamin E is relatively non toxic but may interfere with other nutrients
TRUE
active form of vitamin K
hydroquinone
function of vitamin K
-activate clotting factors II, VII, IX, and X
-carboxylates some proteins
