Neonatal testosterone augmentation increases juvenile play fighting but does not influence the adult dominance relationships of male rats

Article Abstract:

Neonatal testosterone supplementation does not influence adult dominance behavior among male rats, but juvenile play fighting does increase with neonatal hormonal treatment. An analysis of play fighting between pairs of male sibling rats was made in which one sibling in each pair had been injected with testosterone propionate (TP) or oil vehicle and one sibling was untreated. Juvenile TP-treated rats started more attacks, though defense responses remained similar between treated and untreated rats. Adult dominance was not influenced by neonatal testosterone treatment.

Testosterone

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Juvenilized play fighting in subordinate male rats

Article Abstract:

The subordinate sibling in a pair of adult male rats is pinned down more often in play attacks because he originates more playful attacks and defends himself in a more juvenile way than his dominant sibling does. A study of 26 male Long Evans hooded rats from five litters analyzed the development of dominance-subordinance relationships. Dominant partners use adult defensive techniques, while subordinates revert to juvenile patterns of turning supine when attacked at the nape.

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