Calving difficulty (dystocia) is a leading welfare problem in dairy cattle that genetic selection and management can reduce.
Cows experiencing dystocia suffer prolonged labor pain, injury from obstructed delivery, and exhaustion. Calves in prolonged labor suffer hypoxia causing brain damage and reduced vitality. Uterine infections following difficult births cause systemic illness in cows. Genetic selection for calving ease and use of calving ease bulls for maiden heifers reduces the frequency of these welfare emergencies.