Sentences with phrase «male rhesus»

Researchers from the University of North Carolina at Chapel Hill (UNC) and the Oregon National Primate Research Center found that the sperm of the male rhesus macaques that were tested stopped moving 30 hours after the compound was administered intravenously.

Red - hot males: sexual strategies of high - ranking male rhesus macaques (Macaca mulatta)[abstract].

Is the red facial coloration of male rhesus macaques (Macaca mulatta) subject to intra-sexual selection?

Alpha male status and availability of conceptive females are associated with high glucocorticoid concentrations in high - ranking male rhesus macaques (Macaca mulatta) during the mating season.

In the PLOS ONE paper, Chan and colleagues describe how three male rhesus macaques they studied displayed cognitive and motor impairments emerging at 16 months of age, and dystonia and signs of neurodegeneration on brain imaging at 24 months of age.

Using a process called somatic cell nuclear transfer (SCNT), a team from Oregon Health & Science University (O.H.S.U.) in Portland implanted the contents of individual skin cells from adult male rhesus macaques into each of 304 macaque egg cells stripped of their genetic material.

Falk suspects the size discrepancy can be linked to the philandering tendencies of our primate ancestors.Falk found that like humans, male rhesus monkeys had larger brains than females, while male and female gibbon apes were equally endowed.

During the study, thirty hours following a high - dose intravenous infusion of EP055 in male rhesus macaques, O'Rand and researchers in the Oregon National Primate Research Center at OHSU in Portland, Oregon, found no indication of normal sperm motility.

Indeed, George once observed that the primitive stasis of the rhesus monkey was largely due to the fact that once a male rhesus obtained senior status «he didn't have to do anything to get laid.»

Not exact matches

Previous studies have shown that rhesus macaque skin coloration is involved in mate selection - both males and females show interest in darker red faces displayed in the opposite sex.

The collaborative international research also shows that skin coloration in male and female rhesus macaques is an inherited quality — the first example of heritability for a sexually - selected trait to be described in any mammal.

Using these images and 20 years of genetic parentage data, the researchers assessed whether the variation in red ornaments influenced fecundity — that is they produced more offspring — and is heritable in male and female rhesus macaques, two necessary conditions for the trait to be considered under sexual selection.

A dominant rhesus with a full belly may let a subordinate take away his meal, says Irwin Bernstein, a University of Georgia psychologist, and a female bored by her alpha male may slip away for a fling with a hot young beta.

Falk reasoned that the extra neurons of men and rhesus males are most likely dedicated to visual - spatial skills, such as map reading, distinguishing between left and right, and mentally rotating figures — all abilities useful for navigating uncharted territories in search of mates.

There's the clutching reaction of the rhesus monkey, in which the female generally reaches back with one hand and grasps the male, sometimes turning and looking over her shoulder at the presumed moment of his climax — which, if it does indicate a female eruption as well, would leave people in the dust when it comes to simultaneous orgasms.

Ten male Indian rhesus macaques (Macaca mulatta), aged 2 — 3 years were subjected to infection with B. burgdorferi by nymphal Ixodes scapularis tick feeding.

In rhesus macaques, mothering style is correlated with offspring cortisol and serotonin levels (14, 15), and in baboons, the male offspring of subordinate mothers exhibit higher glucocorticoid levels than the offspring of more dominant mothers (16).

We tested the hypothesis that a repeat polymorphism in the rhesus macaque MAOA gene promoter region influences aggressive behavior in male subjects.