I forgot to mention Dr Mosley (UK-TV). A recent episode contained a feature on gut bacteria and it's importance to our wellbeing. A scientist ran a series of experiments on introducing healthy bacteria into the gut. It concluded that the best method was full fat probiotic yoghurt. As the stomach contains enough acid to melt a fizzy drinks tin (as shown in the programme), it explained that animal fat was by far the best method of protecting the bacteria long enough to get it into the gut. It worked even better than the capsules.
Hope that helps.