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In the present study causes for the development of milk ejection disorders (MED) inprimiparous cows of two herds were investigated. We hypothesised that MED are provokedby social problems within the herd that appear close to calving. Data were collected on 67heifers of herd A and 60 heifers of herd B. In herd A, heifers were introduced into existinggroups of cows 2–4 weeks prior to calving. They were kept in a group housing system withdeep bedding. All animals were hornless. In herd B, heifers were kept separated from the cowsfrom 2–4 weeks a.p. in a three-row cubicle barn. In contrast to herd A, all animals had horns.The animals´ reactions regarding the milking process and MED were analysed during thefirst four milkings p.p. We evaluated the correlation between social rank, group size andfrequency of group changes in the antepartal period and the occurrence of MED.  12 % of the animals in herd A and 47 % of the animals in herd B showed MED. In herd A, lowrankingheifers had significantly more often MED than higher-ranking heifers. A correlationbetween low rank, increasing strain due to rank order fights and increasing frequency ofMED can be assumed here. In herd B, a correlation between stocking rate and frequency ofMED could be observed

Effect of rank, group size and number of group changes ante partum on the occurrence of milk ejection disorders in primiparous cows – a field study