1 a percent of males copulating each week to a

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Fig. 1. (A) Percent of males copulating each week to a criterion of behavioral ejaculation. One group of males was tested bi-weekly beginning 1 week after castration (filled circles; N = 9) and the other was first tested 7 weeks after castration (open circles; N = 11). Mean ± SEM (B) mount, (C) intromission, and (D) ejaculation latencies and (E) post ejaculatory interval of persistent copulators (those that that ejaculated 7 weeks after castration) tested bi-weekly beginning 1 week after castration (filled circles; N = 6) and first tested 7 weeks after castration (open circles; N = 10). *Significantly different from respective pre-castration values at week − 1 ( p < 0.05). Ruth M. Costantini , Jin Ho Park , Annaliese K. Beery , Matthew J. Paul , June J. Ko , Irving Zucker Post-castration retention of reproductive behavior and olfactory preferences in male Siberian hamsters: Role of prior experience Hormones and Behavior Volume 51, Issue 1 2007 149 - 155
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The Coolidge Effect:
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Germline cells a.k.a Germ stem cells is a preparatory step for reproduction…need to get to ova… This requires sexual arousal and ejaculation which are controlled by ANS…
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Sex in the Autonomic NS Sexual behavior requires coordination of parasympathetic and sympathetic NS. Parasympathetic NS is activated during sexual arousal. Sympathetic NS is activated during orgasm. Sensory pathways carry information regarding genital stimulation to CNS.
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Autonomic Control of Sexual Arousal
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Female Rat Precopulatory Behavior: Solicitation (Appetitive) Female rats actively solicit males Used competitively during group mating
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Female Rat Precopulatory Behavior: Proceptivity Proceptive behavior enhances “attractivity” Includes ear wiggling, hopping-darting, pheromone emission “Attractiveness” increases male approach/proximity measures and pursuit.(e.g. rats will not attempt to copulate with an OVX F) Disruption of proceptive behavior (e.g P antagonist) decreases attractiveness to male.
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Female rat consummatory (copulatory) behavior: Lordosis For rats and other rodents, female copulatory behavior is passive and consists of promoting male intromission The arching of the back with tail displacement (where applicable) is referred to as Lordosis
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Lordosis scores
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Effects of Ovarectomy (OVX) on F sexual behavior in rodents OVX—removal of the ovaries Ovaries produce both Estrogens E & Progesterone P F rodents only allow a male to intromit (show a lordosis response) during proestrus or behavioral estrus F ovulate in estrus (importance of pacing) Removing either E P or both can affect both appetitive (motivation) and consummatory behaviors
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Endocrine Function in Rat Estrus Cycle Diestus: Low E & P, releases LH & FSH from negative feedback and LH & FSH rise producing growth of follicle which increases E. Proestrus: Hypothalamic GnRH control of LH & FSH regulated by E in positive feedback (unknown mechanism) resulting in LH surge that causes ovulation.
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