PSYC 327 Lecture Notes - Lecture 21: Ejaculation, Defeminization, Teratospermia
25 Sep 2016
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Document Summary
In humans the number of sperms ejaculated is correlated with the time since last within-pair copulation. Males need time for sperms to be replaced. Abnormal morphology (teratospermia) is associated with male factor infertility with reduced fertilization and pregnancy rates. Female rat there is variation in mating strategy. Parental effect as a major source of individual differences in life history strategies. Environmental signals -> parental investment -> developmental outcome. Environmental signal: nutrient supply, mate quality, violence, infection, and population density. Cricket frogs- males can be calling vs satellite. More testosterones in the last eggs that are laid. No difference in the # of living pups and weight at weaning between high and low grooming mothers. Daughters that had high levels of care from mother will give high levels of care to their offspring. She paces the mating until male reaches 15 intromissions/ejaculations. Females with low levels of care were more receptive and had more reproductive success.
