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In behavioural ecology weaning is the life-history transition at which a mother ceases to invest milk in her current offspring, and because mother and young value that investment differently it is a site of conflict: the young demand nursing longer than the mother is selected to give. Trivers's 1974 Parent-offspring conflict made weaning the paradigm case, deriving when selection favours the mother cutting off and the offspring resisting. The referent is the same biological event (the end of dependence on maternal milk) that livestock managers later had to stage deliberately, measured here by the timing and intensity of weaning conflict.[1]
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