To make a Cow give a good supply of Milk (Spell)

From Egyptian Secrets of Albertus Magnus, Joseph H. Peterson edition:

To make a Cow give a good supply of Milk.

When a cow, for the first time, calves, or while carrying a calf, give her half of the tail of an eel on a half slice of bread, and henceforth she will give milk in abundance.

The grimoire Egyptian Secrets of Albertus Magnus lists this spell.

Timeline of related events