Western Australia, Vitamin A for sheep, Sheep supplements
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Grazing animals build up their reserves of Vitamin A from the carotene present jn green plants. In the West Australian wheatbelt most stock have to subsist mainly on dry feed during summers which last from five to seven months. It seems unlikely that any appreciable amount of edible greenstuff is available during this "annual drought." It is not surprising, therefore, that stock losses which have occurred in the late summer months have been attributed to lack of Vitamin A.
Snook, L C.
"Vitamin A supplements for sheep,"
Journal of the Department of Agriculture, Western Australia, Series 3: Vol. 3
, Article 20.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture3/vol3/iss4/20