Commentary for Kiddushin 14:2

The Talmud learns three halakhot relevant to sacrifices and things dedicated to the Temple. The concept discussed here is called “defferal” or “dichui.” Once something has become invalid as a sacrifice, it can never return to becoming valid. This applies to live animals—so we learn from the half-dedicated animal. 2) It can be “deferred” even from the outset, as soon as it is fit. Others say (elsewhere) that in order for a sacrifice to be permanently deferred, it must first be fit for a sacrifice. This animal which was only half-dedicated, never was fit to be offered. 3) Deferral applies even if only the value of the animal was dedicated, like this one half of whose value was dedicated.