17 Horm & M behav1

17 Horm & M behav1 - Male Lifetime Cycle: T &...

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Plasma T (nmol/l) Sperm production (% of maximal)
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Ellison et al. 
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Diurnal Androgen Secretion Wiebe et al. 
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Seasonal Cycle: Androgens O N  D  J  F  M A M  J  J  A  S  O N  D  J n = 12 adult male Japanese macaques Rostal et al. (1986) 3X more
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O N  D  J  F  M A M  J  J  A  S  O N  D  J Rostal et al. (1986) Sex
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Rostal et al. (1986) births
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Social Control of Breeding? Nonbreeding Season receptive pregnant or lactating anestrus small testes Breeding Season Females: Males: large testes pale colored scrotum bright red color low androgen levels high androgen levels no spermatogenesis spermatogenesis no sexual behavior yawning, displays vaginal closure cycling less aggression more aggression
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M Behavioral Response to F Condition nonbreeding M  paired w/ ovex F same nonbreeding M  paired w/ ovex F on E2
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M Physical Response to F Condition 1)  nonbreeding M w/ ovex F ->  no physical change       (2 wks)  2)  nonbreeding M w/ ovex F on E2   ->
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17 Horm & M behav1 - Male Lifetime Cycle: T &...

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