Varieties of Milk Supermarkets now stock many different varieties of milk. The most common is still cow's milk, but others include sheep and goat's milk, as well as a number of plant-based substitutes, including soya, rice, oat and almond milk. Milk is generally distinguishable by its fat content. Whole milk is relatively high in fat and certainly semi-skimmed and skimmed milk can be labelled as low-fat food. Contrary to popular belief, lowering the fat content in milk does not affect the calcium content, so an adequate calcium intake can still be obtained from lower-fat dairy products.