Species or sub species/strain of milk kefir
Milk kefir typically refers to a type of fermented milk beverage made by fermenting milk with kefir grains. Kefir grains are a combination of bacteria and yeast that ferment the lactose in milk, producing various strains of beneficial bacteria and yeasts.
There are different strains of bacteria and yeasts found in kefir grains, resulting in variations in taste and texture of the final product. Some commonly known species or strains of bacteria and yeasts found in milk kefir include Lactobacillus kefiranofaciens, Lactobacillus kefir, Lactococcus lactis, Streptococcus thermophilus, Saccharomyces kefir, and Kluyveromyces marxianus.
However, it is important to note that milk kefir is not typically categorized into specific sub-species or strains, as the composition of kefir grains can vary depending on various factors such as geographical location and production conditions.