Question

In animals, Grass tetany is caused due to deficiency of
A. Silicon
B. Sodium
C. Magnesium
D. Selenium

Answer 1

Hint:
Low levels of magnesium in the blood are linked to the highly lethal condition known as grass tetany. All types of cattle are susceptible to grass tetany, but older cows with calves at foot in the winter and spring are especially vulnerable. Animals that are excessively thin or obese, as well as Angus cattle and their crosses, are also more prone. Grass tetany is usually a medical emergency requiring prompt care. A magnesium and calcium solution is intravenously administered as part of the treatment. A high level of magnesium in the blood may be achieved in 15 minutes after a subcutaneous injection of magnesium sulphate.

Complete answer:
Low blood serum magnesium levels (hypomagnesaemia), which can be caused by a simple diet shortage or more frequently by forage magnesium being converted to an insoluble form in the digestive tract, are a defining feature of grass tetany. Early in the growing season, forages have high moisture levels, which cause nutrient levels to be lower and more diluted. Because of the grass's high potassium content and low magnesium and calcium content, your herd may experience digestive problems.
So, Grass tetany is caused due to deficiency of Magnesium.

Option ‘C’ is correct

Note:
Chronic selenosis, also known as alkali illness, affects animals who consume grains containing 5 to 40 mg selenium/kg over the course of several weeks or months. Lameness, malformed hooves, hair loss, and emaciation are among the symptoms of liver cirrhosis. Selenium is a vital component of several enzymes and proteins, termed selenoproteins, that help to create DNA and guard against cell damage and infections; these proteins are also involved in the reproduction and the metabolism of thyroid hormones.
It can help with fertility, immune system performance, and cognitive function. Selenium is a nutrient that is essential for maintaining DNA synthesis, thyroid hormone metabolism, and defense against infection and oxidative stress.