It comes both ways, and also in the pure form (feed grade magnessium oxide) that can be mixed with salt on the farm. It tastes bad, so its hard to get them to eat enough of it.
As to me personally, I dont use blocks of anything. There's a lot of reasons but mostly its to teach the cows that when they see me they come running to get it. With grass tetany season, I usually use a feeder to make sure they get it all the time but otherwise I hand feed them their salt and mineral mix. I've had some real train wrecks over the years with minerals so I get a custom mix from a mineral dealer. Its not that much more expensive (11.00 for a 50 pound bag) compared to generic mineral mixes and I know its balanced to my specific farm.
As to grass tetany it doesnt matter so much as you want to suppliment at the full rate. Just too much variance otherwise. Pastures that have been fertilized with nitogen and or potash will have more problems. Pastures with highly available calcium (near neutral pH) will have more problems. As to other minerals, it matters a lot more. I've got 2 farms less than 7 miles apart but in two different watershed. In looking at liver and blood samples its been rather amazing the difference in copper and selenium levels in the cows. Thats why I like the custom mineral blend, he can mix it farm specific.
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Today's Featured Article - The David Brown Rose Badge - by Samuel Kennedy. In the 13th century civil war was raging in England. Two English noblemen were involved in a conflict which became known as the War of the Roses. The Duke of York had as his emblem a white rose and the Earl of Lancaster had a red rose. Today the white rose is the official emblem of the county of Yorkshire and the red rose has been adopted by the neighboring county of Lancashire.
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