These are similar to symptoms of milk fever. Now is time to take preventative measures. So feed a mineral that's high in magnesium. Most feed companies sell high-magnesium mineral supplements. Use loose mixtures if your farm has a history of grass tetany.
Blocks are OK if there's been little pro blem in the past.
If you've had problems with grass tetany in the past, work closely with your veterinarian and county Extension agent to develop a grass tetany strategy. Things that prevented grass tetany in the past may not be enough this year. That's because of the poor hay-making conditions last year. Lactating cows will lose a large amount of weight and conditioning on hay of this quality unless you provide several pounds of supplementary grain. Nutritionally deprived cattle are more susceptible to metabolic diseases such as grass tetany and milk fever.