Sheep, Feed supplements, Calcium
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Sheep fed cereal grains as an energy source over summer usually need added calcium because cereal grains are generally low in calcium (for example, 0.03 per cent calcium compared to 0.26 per cent phosphorus), and there may not be a natural source such as clover, weeds, leafy stubble or edible bush in the paddock.
The safestt and most effective calcium supplement is finely ground limestone added to the feed, but some farmers have used other sources of calcium such as gypsum and superphosphate in this manner.
Peet, R L. and Hare, Michael
"Choosing a calcium supplement for sheep fed cereal grains,"
Journal of the Department of Agriculture, Western Australia, Series 4: Vol. 30
, Article 8.
Available at: https://researchlibrary.agric.wa.gov.au/journal_agriculture4/vol30/iss2/8