Old, high risk cows 1 when they first show signs of calving, then 2 or even 3 more at 12 or 24 hr. intervals after calving.
Lower risk 1 post calving.
First and second calvers ,nothing.
Has massively reduced clinical milk fever and use of bottles. My understanding is they only give about 12 hours cover.
We do put Mag in water for 3 weeks prior to calving
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