Anytime that your animals are under stress they may need extra supplementation.

Unfortunately you often you can’t tell until it’s too late e.g. it is too late if the stock doesn’t fall pregnant or they suffer from birthing difficulties.

Then there are obvious signs of problems such as excessive worm burden, poor weight gain,

eye, foot, staggers problems, scours or animals simply unable to digest dry fibrous food.

It is far more economical to give a background dose before these problems occur.