urethra from compression during copulation. Consistent with a role in mechanical support, certain primates and carnivore species that have prolonged copulation also have a longer baculum. A role in female stimulation also seems likely, particularly in species where copulation is prolonged with multiple intromissions, thrusting or multiple ejaculations. Copulatory stimulation can have important ...

The health industry has acquired a reputation as lagging in the use of IT. This reputation is usually based upon the relatively narrow measure of comparative IT expenditure, often examined as a proportion of total revenue. This study has been undertaken to assess health's use of IT using a broader frame of reference. The health industry was compared to the banking industry, on the basis that th...

The purposes of the present study were to establish a noninvasive monitoring assay of fecal progestagen measurement to detect pregnancy and to identify the components of fecal progestagens in early, middle and late pregnancy in cheetahs. Feces were collected from 7 female cheetahs and analyzed from 30 days before the last copulation to parturition in 9 pregnancies. Blood was collected from one ...

Microinjection of apomorphine into the ventral tegmental area (VTA) of male rats was previously shown to delay the onset of copulation and slow its rate, presumably by stimulating impulse-regulating autoreceptors on cell bodies of the A10 mesocorticolimbic dopamine tract. Such stimulation would be expected to slow the firing rate of these neurons and, thereby, to impair locomotion and/or motiva...

Dopamine (DA) in the medial preoptic area (MPOA) has been shown to facilitate male rat sexual behavior. However, injections of the catecholamine (CA) neurotoxin 6-OHDA into the MPOA did not impair copulation in tests 3 days after injection. In the present study, three weekly (serial) injections produced no copulatory deficits compared to animals that received a single injection or to preinjecti...

Steroid hormones regulate sexual behavior primarily by slow, genomically mediated effects. These effects are realized, in part, by enhancing the processing of relevant sensory stimuli, altering the synthesis, release, and/or receptors for neurotransmitters in integrative areas, and increasing the responsiveness of appropriate motor outputs. Dopamine has facilitative effects on sexual motivation...