In animals, Grass tetany is caused due to deficiency of

The correct answer is Magnesium.

Explanation:

Grass tetany (also known as hypomagnesemic tetany or grass staggers) is a serious and potentially fatal metabolic disease in livestock, particularly ruminants such as cattle and sheep.

Key Details:

1. Cause: It occurs due to an acute deficiency of Magnesium (Mg) in the animal's blood plasma.

2. Occurrence: This condition commonly happens when animals graze on rapidly growing, lush spring pastures or cereal crops. Such pasture grass is often high in potassium and nitrogen but low in magnesium and sodium, which impairs magnesium absorption in the rumen.

3. Symptoms: Affected animals may show symptoms such as twitching muscles, uncoordinated gait, hyperexcitability, convulsions, tetanic spasms, and sudden death if not treated promptly with magnesium supplementation.