Hazell Mullins: Clinical Milk fever cases are only the tip of the iceberg

I remember vividly in my days in vet school in Nottingham, in which milk fever/Hypocalcaemia based lectures always contained an image of an iceberg floating ominously in the ocean.

The image is now ingrained in my memory and illustrates that the clinical cases, or the downer cows on farm, were only the smaller tip of the iceberg and the hidden base represented the subclinical cases.