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Journal of the Department of Agriculture, Western Australia, Series 3
Vitamin supplements, Sheep, Cattle
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Vitamin A is essential for the health and wellbeing of all animals and birds. This vitamin is obtained by grazing animals from carotene, an orange pigment present in green plants. When plant material matures and dies, the carotene is quickly destroyed by sunlight. This means that dry herbage in the field becomes worthless as a source of Vitamin A.
Snook, L. C.
"Vitamin A supplements for sheep and cattle,"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 6:
4, Article 9.
Available at: https://library.dpird.wa.gov.au/journal_agriculture3/vol6/iss4/9