Results 271 to 280 of about 740,340 (315)

Reproductive Capacity of Aging Female Rats

Neuroendocrinology, 1975
Multiparous female Long-Evans rats, 20 months or older, were seen to progress from irregular estrous cycles to a constant-estrous syndrome to a series of irregular pseudopregnancies to an anestrous state. An animal in constant estrus was characterized by ovaries with well developed and sometimes cystic follicles, no corpora lutea, an estrogen ...
H H, Huang, J, Meites
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Curt Richter and the female rat

Appetite, 2007
Richter fully appreciated the fundamental biological importance of sex differences, in particular the challenges of female reproductive function to the two classes of behavior that most engaged him, endogenous rhythms and "self-regulatory" behaviors.
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Sexual behavior in female rats born in all-female litters

Behavioural Brain Research, 1982
Females born in all-female litters and females stemming from predominantly male litters were compared for masculine (mounting) and feminine sexual behavior (lordosis) under various dosages of estradiol followed by progesterone and under testosterone stimulation. Estradiol did not affect mounting levels in these groups.
N E, Van de Poll, S M, Van der Zwan, H G, van Oyen, J H, Pater   +3 more
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Urethral catheterization of the female rat

Lab Animal, 2011
Urinary tract catheterization of the rat may be required for a variety of clinical and experimental reasons. The external urinary orifice is easily visualized and rests anterior to the vaginal opening, making urinary tract catheterization easier in the female rat than in other species.
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Sexual reflexes in male and female rats

Neuroscience Letters, 1988
A novel preparation for the study of male and female sexual function in anesthetized, acutely spinalized rats is reported. In both sexes, the coitus reflex (the neuromuscular concomitants of sexual climax) could be elicited by mechanical stimulation of the distal urethra.
Chung, SK, McKenna, KE, McVary, KT
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Proestrous gonadotropin levels in thyroparathyroidectomized female rats

Experientia, 1976
Intact and TPTx animals showed the expected afternoon increase in serum LH,FSH and prolactin levels. But the afternoon increase in serum LH levels in TPTx rats was less than that observed for intact animals (p less than 0.001). Neither serum prolactin nor FSH levels were altered by TPTx.
J, Dunn, R, Peppler, M, Hess, D C, Johnson   +3 more
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Receptive behavior in developing female rats

Hormones and Behavior, 1975
Abstract In a series of experiments the development of sexual behavior was studied in female rats. Lordosis behavior in response to manual stimulation was induced in 100% of 19-day old females by treatment with 10 μgm estradiol benzoate (EB) and 0.5 mgm progesterone (P) and earwiggling was displayed at earlier ages. During normal development, vaginal
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Sexual behavior in aged, noncycling female rats

Physiology & Behavior, 1977
Abstract Sexual behavior of 19 month old, noncycling, female rats was evaluated for a period of 8 days. The sexual behavior of 11 aged females revealing constant vaginal cornification (CVC) for 30 days prior to, and during the observation period was variable.
R L, Cooper, M, Linnoila
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Episodic Corticosterone Secretion in the Female Rat

Hormone Research, 1980
Studies conducted in several laboratories have shown primate glucocorticoid secretion to occur episodically. In light of the methodological, as well as physiological importance of this finding, the present study was undertaken to determine whether the rat corticosteroid secretion also occurs episodically.
A J, Carrillo, P G, Duke, J D, Dunn
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Comparison of cystometric methods in female rats

Neurourology and Urodynamics, 2007
AbstractAimsRat cystometry is a common model used to investigate urinary storage and voiding function. The effect of cystometric instrumentation in rat studies might be a source of deviation from normal physiologic responses. We hypothesized that transurethral catheterization would produce obstruction‐related changes, and that suprapubic ...
Phillip P, Smith, Eric, Hurtado, Christopher P, Smith, Timothy B, Boone, George T, Somogyi   +4 more
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