Benefits of Castor Oil in the water for chickens

HELLO CHICKEN KEEPERS.

COULD ANYBODY TELL ME WHAT THE BENEFITE ARE WHEN ADDING CASTOR OIL TO THE CHICKENS DRINKING WATER AND HOW MUCH C/O WOULD IA DD PER LITRE OF WATER?

the only uses ive found on castor oil and chickens are:
egg bound
compacted crop
and scaly legs

and this one:
Wasting
Management Treatments
Purge birds with castor oil (2 tsp.) followed by a stimulating tonic
of powdered fennel, anise, coriander, and cinchona (30 grains
each). Give powdered gentian and ginger (1 dram each).
Give powdered sulfate of iron (15 grains); mix and add to feed.
Homeopathic Treatments
Hepar sulph or Nat Mur