(in other words, a batch of kefir milk
culture left unattended for an extended period of time (4 + days, unrefrigerated) will become rancid and useless)[Also difficult to ship or preserve]- GRAINS
= Kefir grains are the source for original kefir
culturing and can be used directly in the
culture, or removed from partially
cultured mixes (creating starter and
mother culture batches) and also used indefinitely.