Probably both this and homogenization. Homogenized milk doesn't taste as good as non-homogenized, in part because homogenized milk is often made of older batche

Probably both this and homogenization. Homogenized milk doesn't taste as good as non-homogenized, in part because homogenized milk is often made of older batches blended into new. Depending on the store, sometimes it's hard to find non-homogenized milk.