In order to provide further evidence for the association of an indurative lymphocytic mastitis in sheep with MVV (maedi‐visna virus) infection, an experimental study was performed. Fourteen MVV‐free pregnant ewes, 2 years of age, were divided into two groups. Eight were intravenously inoculated with MVV (strain ZZV‐1050); six ewes served as sham‐inoculated controls. Post‐mortem exat. inations were carried out at 8, 16 and 28 months.