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Not AvailableIn order to determine the effect of various mating regimens on the expression of sexual behavioural activities of purebred Landrace boars, a study was conducted at Swine Production Farm, LPM Section, IVRI, Izatnagar, India. Six apparently healthy (Age: 8.5±0.5 months) purebred Landrace boars were selected and randomly mated to 18 purebred Landrace gilts following outdoor hand mating system under three different treatment groups, viz., single mating (T1), double mating (T2) and triple mating (T3) during a single oestrus of the gilts. Pre-treatment libido score was similar for all the boars. Data were manually recorded in all the mating sessions (Average duration of 19.50±1.00 minutes) using specialized data coding sheets for the occurrence, frequency and duration of the behavioural activities performed by the boars. Among pre- and post coital behavioural activities, the most frequent behaviour was nosing (2.61±0.16 and 1.65±0.14). On an average, 1.26±0.09 successful mounts were achieved after an average of 3.35±0.32 total mount attempts during the mating sessions. During copulation, a significantly (P