[...] A milk cow only lactates if she has recently given birth, and this means that each dairy cow must be bred back roughly once a year. Calving is continual, and crucial. At the same time, the calf must be displaced so that it does not consume the bulk of the milk that is to be collected and sold. [...] The mothers cried out for their calves all through the night, and the night after, and the night after that. [...]