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The tests are in ....
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<blockquote data-quote="regolith" data-source="post: 645803" data-attributes="member: 9267"><p>Low mag is implicated with milk fever and I def. have lost cows on this farm to low blood magnesium! Usually a calving problem, but in high potash (effluent) paddocks I've found milk cows flat out without warning. Then autumn, late lactation, more cows going down ... blood test showed low mag.</p><p>Dairy cows more susceptible of course because greater stress/milk yield.</p><p></p><p>I use magnesium oxide, in an all-grass system. The dose per cow straight down the throat is 30 grams MgO per day. Dusted on the pasture or over feed, it's 100 g (4 oz) per cow pre-calving, probably only fifty at other times of the year.</p><p>MgChloride can be added to water at 60 g/cow/day but needs to be introduced gradually and this is only half the requirement pre-calving/early lactation so needs to be supplemented in another way as well (but for beef cows half dose is possibly enough).</p><p></p><p>I wouldn't be pulling calves. The magnesium needs to be given directly to the cow, not free-choice. High potash feeds/pastures can cause Mg deficiency - I've been told balancing the potash with salt can be effective, never done it myself. The salt is spread on the pasture as fertiliser.</p><p>Mag chloride can be dissolved in water and sprayed on pasture, but it's nasty on gear - corrosive.</p><p></p><p>I'm not too sure what the treatment rate is for grass tetany as opposed to straightforward milk fever. The injectible calcium bags with added mag I'm pretty sure contain 60 g MgCl, but I've also been told that's not enough if magnesium deficiency is the main problem. For a 'preventative' calving drench I start with double the reccomended rate - 60 g MgO, 100 g CaC04 (limeflour), 1 - 200 g molasses - and give them that once daily till the danger period is over. It is possible to overdose them on magnesium (they will scour and look very relaxed/dopey).</p></blockquote><p></p>
[QUOTE="regolith, post: 645803, member: 9267"] Low mag is implicated with milk fever and I def. have lost cows on this farm to low blood magnesium! Usually a calving problem, but in high potash (effluent) paddocks I've found milk cows flat out without warning. Then autumn, late lactation, more cows going down ... blood test showed low mag. Dairy cows more susceptible of course because greater stress/milk yield. I use magnesium oxide, in an all-grass system. The dose per cow straight down the throat is 30 grams MgO per day. Dusted on the pasture or over feed, it's 100 g (4 oz) per cow pre-calving, probably only fifty at other times of the year. MgChloride can be added to water at 60 g/cow/day but needs to be introduced gradually and this is only half the requirement pre-calving/early lactation so needs to be supplemented in another way as well (but for beef cows half dose is possibly enough). I wouldn't be pulling calves. The magnesium needs to be given directly to the cow, not free-choice. High potash feeds/pastures can cause Mg deficiency - I've been told balancing the potash with salt can be effective, never done it myself. The salt is spread on the pasture as fertiliser. Mag chloride can be dissolved in water and sprayed on pasture, but it's nasty on gear - corrosive. I'm not too sure what the treatment rate is for grass tetany as opposed to straightforward milk fever. The injectible calcium bags with added mag I'm pretty sure contain 60 g MgCl, but I've also been told that's not enough if magnesium deficiency is the main problem. For a 'preventative' calving drench I start with double the reccomended rate - 60 g MgO, 100 g CaC04 (limeflour), 1 - 200 g molasses - and give them that once daily till the danger period is over. It is possible to overdose them on magnesium (they will scour and look very relaxed/dopey). [/QUOTE]
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