Magnesium status of dairy cows

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Abstract
Extract Madam:– Magnesium has been identified as an important mineral in the nutrition of dairy eows and reeent findings in New Zealand( 1 Young, P.W. , Rys, G. and O'Connor, M.B. 1981. Hypomagnesemia and dairy production. Proc. N.Z. Soc. An. Prod., 41: 61–67. [Google Scholar] ) emphasize this importance. For example, a large survey of dairy animals( 2 Young, P.W. , O'Connor, M.B. and Feyter, C. 1979. Importance of magnesium in dairy production. 30th Ruakura Farmers Conf. Proc. MAP, : 110–120. [Google Scholar] ) showed one-third of almost one million cows could be suffering from hypomagnesemia. A separate survey ( 3 1984. Surveillance. Bovine hypomagcsemia, 11: 5–7. Published by the Ministry of Agriculture and Fisheries Private Bag, Wellington [Google Scholar] )> involving 76 farms estimated that supplementing with magnesium to prevent hypomagnesemia would have produced a net benefit of between $1,600 and $4,250 per farm. The cost/benefit ratio was remarkably high and ranged from 11–28.

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