The problem with these programmes, like a lot of wildlife programmes is that they disneyfy animals. Yes, cows will look after other babies in the herd as do a lot of animals, but they will attack without caution a strange calf trying to suckle. Sheep will butt off lambs and pigs will kill their own piglets, so its not all cuddles down on the farm. Animals only have three motivations, reproduction, food and safety from predators.
This is why I avoid programmes like this, aimed at those who know little about real farm animals. Another fallacy is that farmers are 'cruel'. I have yet to meet a cruel farmer, and have seen many grown men reduced to tears because they have lost a calf or lambs.