Oestrous and birth synchrony in Norway rats, Rattus norvegicus
Article Abstract:
Research into oestrous and birth synchrony in 22 groups of four sibling Norway rat females from puberty to the birth of their first litters is presented. It was found that the degree of oestrous synchrony is not linked to the degree of birth synchrony. This indicates that oestrous synchrony is not a mechanism for birth synchrony.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 2001
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Prudent sperm allocation in Norway rats, Rattus norvegicus: A mammalian model of adaptive ejaculate adjustment
Article Abstract:
The study collects copulatory ejaculates from 12 male rats that each mated under two experimental conditions: alone in a cage with a female and male who observed the competition from behind a perforated plastic screen. It concluded that mal rats ejaculated significantly more sperm when mating in the presence of a rival male than when mating in a monandrous setting.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 2004
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Does risk of small mustelid predation affect the oestrous cycle in the bank vole, Clethrionomys glareolus?
Article Abstract:
Risk of small mustelid predation suppresses the reproduction of female bank voles. When exposed to predation risk, females have fewer but sometimes abnormally longer oestrous cycles. The suppression can be a direct effect of the predators' odor. Indirectly also, reproductive cycling is affected as males exposed to predator risk avoid advertising their presence and odor cues that would have stimulated females. Further research is needed to determine the selective advantage of oestrous suppression on future survival.
Publication Name: Animal Behaviour
Subject: Zoology and wildlife conservation
ISSN: 0003-3472
Year: 1996
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