pcv
In the small intestine, proteins are broken down into their amino acids with the help of enzymes. The horse can only utilise the proteins or amino acids that are digested and absorbed before the large intestine (caecum = first section of the large intestine). The abbreviation pcv (precaecal, i.e. digested before the large intestine) is used for such protein or such amino acids.
See also: Small intestine digestible, Crude protein