with the milk fever, it's always due to extremely bad management. cows that are going to or have just calved have a sudden higher need of calcium. when you feed your lactating cows and your dry cows the same amount of calcium, you will most likely get milk fever, because the cow's metabolism excretes all the excess calcium, not needed prior to calving, and will continue to do for a while after the need for more calcium has arised. so it's a question of not letting a dry cow's metabolism get used to too much calcium. that way the extra calcium in the lactation ration will be kept inside the cow, and can be used, istead of the cow not finding any calcium, causing her metabolism to flip.
a few weeks before calving the animal has to be put on a lactation diet, not after she calved, because then your problem will be even worse.
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