Sexual Maturation of Male and Female White-Footed Mice (Peromyscus leucopus noveboracensis): Influence of Physical or Urine Contact with Adults

1984 ◽  
Vol 65 (1) ◽  
pp. 97-102 ◽  
Author(s):  
C. R. Terman
Keyword(s):  
Sexual Maturation ◽  
Peromyscus Leucopus ◽  
Male And Female

scholarly journals Characterization of the imaginal reproductive diapause of Oebalus poecilus (Dallas) (Hemiptera: Pentatomidae)

2003 ◽  
Vol 63 (4) ◽  
pp. 695-703 ◽  
Author(s):  
R. S. S. Santos ◽  
L. R. Redaelli ◽  
L. M. G. Diefenbach ◽  
H. P. Romanowski ◽  
H. F. Prando
Keyword(s):  
Body Fat ◽  
Sexual Maturation ◽  
Abdominal Cavity ◽  
Reproductive Organs ◽  
Reproductive Organ ◽  
The Body ◽  
Reproductive Diapause ◽  
Male And Female ◽  
In The Beginning

The state of development of the internal reproductive organs of male and female Oebalus poecilus (Dallas) as well as the body fat amount in the abdominal cavity during hibernation, of individuals sampled in bamboo litter in Eldorado do Sul (30º02'S and 51°23'W), RS, Brazil was investigated. Females and males showed the abdominal cavity filled with body fat in the beginning of the hibernation phase. The decrease in fat reserve level occurred from August on for males and from October on for females. Ovaries and testis doubled in length and tripled in width from immature to the reproductive phase. Male sexual maturation occurred in the hibernation sites while for females it occurred later on outside of the sites. Reproductive organ immaturity and abdominal body fat hypertrophy characterized the diapause of O. poecilus.

scholarly journals The influence of psychological stress in early life on sexual maturation and sexual behavior in male and female rats

2020 ◽  
Vol 19 (2) ◽  
pp. 135-141
Author(s):  
Kiyohito Yano ◽  
Toshiya Matsuzaki ◽  
Takeshi Iwasa ◽  
Yiliyasi Mayila ◽  
Rie Yanagihara ◽  
...  
Keyword(s):  
Sexual Behavior ◽  
Psychological Stress ◽  
Sexual Maturation ◽  
Early Life ◽  
Female Rats ◽  
Male And Female ◽  
Male And Female Rats

Sexual maturation and fertility of male and female mice exposed prenatally and postnatally to trivalent and hexavalent chromium compounds

1998 ◽  
Vol 10 (2) ◽  
pp. 179 ◽  
Author(s):  
M. H. Al-Hamood ◽  
A. Elbetieha ◽  
H. Bataineh
Keyword(s):  
Hexavalent Chromium ◽  
Sexual Maturation ◽  
Potassium Dichromate ◽  
Reproductive Toxicity ◽  
Female Offspring ◽  
Male Offspring ◽  
Experimental Conditions ◽  
Male And Female ◽  
Female Mice ◽  
Chromium Compounds

The reproductive toxicity of trivalent and hexavalent chromium compounds was investigated in male and female mice exposed to 1000 ppm chromium chloride and potassium dichromate via their mother during gestational and lactational periods. Fertility was reduced in male offspring exposed to either trivalent or hexavalent chromium compounds. Body weights and weights of testes, seminal vesicles and preputial glands were reduced in trivalent-exposed male offspring. The exposure of female mice offspring to trivalent and hexavalent chromium compounds delayed sexual maturation. Fertility was reduced in female offspring exposed to either trivalent or hexavalent chromium compounds. The exposure of female mice to hexavalent chromium compound reduced the number of implantations and viable fetuses respectively. Body weight and weights of ovaries and uteri were reduced in trivalent-exposed female offspring. The results indicate that under our experimental conditions, the exposure of male and female mice offspring to either trivalent or hexavalent chromium compounds during gestational and lactational periods impair reproductive functions and fertility in adulthood.

scholarly journals Food of the squid Nototodarus gouldi in Bass Strait

1983 ◽  
Vol 34 (2) ◽  
pp. 261 ◽  
Author(s):  
D O'Sullivan ◽  
JM Cullen
Keyword(s):  
Water Column ◽  
Sexual Maturation ◽  
Mantle Length ◽  
Frequency Of Occurrence ◽  
Benthic Species ◽  
Male And Female ◽  
Timing Of Spawning

A study was carried out on the food of the squid N. gouldi, based on 1277 individuals collected by Japanese vessels jigging in Bass Strait from November 1979 to April 1980. Most of the food consisted of crustaceans, fish and cephalopods, with crustaceans being more common in smaller animals and cephalopods in larger ones. The crustaceans, which included several benthic species, were more common in the diet at night than by day. Cannibalism by N. gouldi did not appear to increase appreciably after the animals were brought aboard and laid together in the collecting troughs. By frequency of occurrence, the contributions to the diet, averaged over all sizes sampled, were fish 37%, crustaceans 36%, and squid 26%; but in terms of biomass fish contributed more. From the size of the beaks of squid taken, it could be shown that the mantle length of these prey was usually not more than half that of the predator. N. gouldi feeds primarily at night, probably moving up from the bottom into the water column. Larger specimens, both male and female, were less likely to contain food in the stomach than smaller ones, and possible explanations are considered. There are some indications about the timing of spawning in 1979-1980, from records of the size and sexual maturation of the animals sampled.

Travel path characteristics for free-living white-footed mice (Peromyscus leucopus)

1995 ◽  
Vol 73 (8) ◽  
pp. 1474-1478 ◽  
Author(s):  
Brock R. McMillan ◽  
Donald W. Kaufman
Keyword(s):  
Surface Structure ◽  
Peromyscus Leucopus ◽  
Structural Features ◽  
Moon Phase ◽  
The Moon ◽  
Free Living ◽  
Male And Female ◽  
Female Mice ◽  
Travel Path ◽  
Fluorescent Pigment

Characteristics of the travel paths of white-footed mice (Peromyscus leucopus) were examined by tracking animals marked with fluorescent pigment in a wooded site in northeastern Kansas. Based on 84 trails made by 49 individuals, it was concluded that tops of structural features (rocks, branches, logs, or rock fence) were selectively used for nighttime travel. Trails averaged 41.7% structural features (SE = 6.0%), whereas sample points 20 cm away from trails averaged 18.0% structural features (SE = 1.8%). This pattern of use of structural features did not differ between male and female mice. Nighttime illumination (according to the moon phase) and season did not affect the proportion of structural features used along travel paths; this suggests that risk from visual predators was not driving the pattern of use of structural features for travel paths by white-footed mice. Rather, white-footed mice may have used surface structure for travel because structural features provide paths that are more easily traveled and remembered. Trees were climbed infrequently (0.6 trees per 100 m of trail), but more in autumn (1.9 trees per 100 m of trail) than in other seasons (0.2 trees per 100 m of trail), which likely resulted from greater availability of seeds, nuts, and fruits during autumn than during other seasons.

Growth Hormone Pulsatility and the Endocrine Milieu during Sexual Maturation in Male and Female Rats

1992 ◽  
Vol 56 (5) ◽  
pp. 619-628 ◽  
Author(s):  
Steven M. Gabriel ◽  
Jaime R. Roncancio ◽  
Nancy S. Ruiz
Keyword(s):  
Growth Hormone ◽  
Sexual Maturation ◽  
Female Rats ◽  
Male And Female ◽  
Male And Female Rats
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