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A Number of copulations by males of different ranks. B Number of young sired by males of different ranks. A total of five groups were observed during the breeding season. DNA was extracted from blood of adults and the tails of pouch young. Blood samples were collected each week from males in groups 1 and 2 at the peak of the breeding season between 20 January and 11 February , and assayed for testosterone. Testosterone concentrations are significantly higher in the breeding season, but there is no clear correlation between dominance rank at either time of the year. A scoring system was used to analyse sexual activity.

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Every 5 min, the enclosure was scanned visually to locate all animals and note their current behaviour.

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A copulating male was considered to have ejaculated when he stopped thrusting. This is surprising, as the tammar has some characteristics often associated with a first-mating advantage, including mate guarding and the formation of a copulatory plug Rudd In these males and those housed with the melatonin-implanted females, this rise in testosterone coincided with the middle of active gestation, suggesting that the increase may result from pheromones induced by the rise in progesterone or other pregnancy hormones at this time. Olfactory stimuli are clearly important in signaling the reproductive condition of females, and males monitor the reproductive status of females by sniffing their urogenital region or pouch sexual checking Renfree et al.

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