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Biology of Reproduction Feb 1992The development of physiological responsiveness to male stimuli in peripubertal female gray short-tailed opossums was examined in this study. Prepubertal females were...
The development of physiological responsiveness to male stimuli in peripubertal female gray short-tailed opossums was examined in this study. Prepubertal females were exposed directly or indirectly to male chemicals (odors) or to no male stimuli. All females exposed directly to deposited male stimuli (22/22) showed estrus at a mean (+/- SEM) age of 127 +/- 2 days. Only 59% (13/22) of females exposed indirectly showed estrus, and at an older mean age of 162 +/- 5 days (p less than 0.01). Vaginal estrus was not observed in any of the females isolated from male stimuli (0/11). Direct exposure of prepubertal females to male odors was associated with higher uterine weights compared to those of indirectly exposed and isolated females. Reproductive success, measured as litter production, of peripubertal females greater than 140 days old was comparable to adult reproductive success. This study has shown that reproductive maturation in pubertal female opossums requires male stimuli, that this stimulus appears to be pheromonal, and that direct exposure to deposited male odors is the most effective stimulus for female reproductive maturation.
Topics: Animals; Estrus; Female; Male; Odorants; Opossums; Ovulation; Pregnancy; Reproduction; Sex Attractants; Sexual Maturation
PubMed: 1536905
DOI: 10.1095/biolreprod46.2.290 -
Journal of Pediatric Endocrinology &... 1995The purpose of this study was to present US reference data for chronological ages at which stages of sexual maturation were observed in white youths. Recent serial data...
The purpose of this study was to present US reference data for chronological ages at which stages of sexual maturation were observed in white youths. Recent serial data from 78 males and 67 females were analyzed to obtain descriptive statistics for the ages at onset of these stages and the mean ages at which the stages are observed. These reference data should assist the identification of white US youths who are maturing at rapid or slow rates and the interpretation of growth data.
Topics: Adolescent; Aging; Child; Female; Growth; Humans; Male; Puberty; Sexual Maturation; Time Factors; United States; White People
PubMed: 7584691
DOI: 10.1515/jpem.1995.8.1.11 -
Pest Management Science Aug 2017Raspberry ketone (RK) is highly attractive to sexually mature, but not immature, males of many Bactrocera species, including Queensland fruit fly ('Qfly', Bactrocera...
BACKGROUND
Raspberry ketone (RK) is highly attractive to sexually mature, but not immature, males of many Bactrocera species, including Queensland fruit fly ('Qfly', Bactrocera tryoni), and acts as a metabolic enhancer in a wide diversity of animals. We considered the possibility that, as a metabolic enhancer, RK in adult diet might accelerate sexual maturation of male Qflies.
RESULTS
Recently emerged adult Qfly males (0-24 h old) were exposed to RK-treated food for 48 h and were then provided only sugar and water. Four doses of RK (1.25, 2.5, 3.75 and 5%) along with control (0%) were tested with two types of food: sugar alone and sugar mixed with yeast hydrolysate (3:1). For flies tested when 4-10 days old all RK doses increased mating probability of flies fed sugar mixed with yeast hydrolysate but did not show any effect on mating probability of flies fed only sugar. No effects of RK were found for flies tested when 10-30 days old for either diet group. There was no evidence that RK affected longevity at any of the doses tested.
CONCLUSION
Feeding of RK together with yeast hydrolysate to immature Qfly increases mating propensity at young ages and accordingly shows significant potential as a pre-release supplement that might increase the proportion of released flies that attain sexual maturation in Sterile Insect Technique programmes. © 2017 Society of Chemical Industry.
Topics: Animals; Butanones; Longevity; Male; Sexual Behavior, Animal; Sexual Maturation; Tephritidae
PubMed: 28139095
DOI: 10.1002/ps.4538 -
Endocrinology Aug 1967
Topics: Animals; Female; Male; Mice; Sex Factors; Sexual Behavior, Animal; Sexual Maturation
PubMed: 4952008
DOI: 10.1210/endo-81-2-345 -
Advances in Experimental Medicine and... 2020What is it about sexuality that makes it such a burning matter since the dawn of mankind? Much was lost of humankind heritage because of society's attitude toward sex... (Review)
Review
What is it about sexuality that makes it such a burning matter since the dawn of mankind? Much was lost of humankind heritage because of society's attitude toward sex and gender, but we've made progress. Medical knowledge progressed incredibly and so did social and cultural norms. In these days, on most places on the planet, there is acceptance. Still, gender issues take a center stage, often inflaming the social and political milieu everywhere. So how informed and prepared is the medical community to deal with these issues? Aside from medical treatments, gender dysphoric patients need mental health and social support throughout life. Do we have enough guidelines for treatments that have life-long effects? Do we actually know all of those effects? There are many issues to consider, like fertility preservation, puberty suppression with its adverse effects, and not in the least, the effects of the hormonal therapy on the target tissues.
Topics: Gender Dysphoria; Gender Identity; Hormone Replacement Therapy; Humans; Sexual Behavior; Sexual Maturation; Sexual and Gender Disorders
PubMed: 32406031
DOI: 10.1007/978-3-030-38474-6_7 -
Hormones and Behavior Jul 2013This article is part of a Special Issue "Puberty and Adolescence". Studies of birds and reptiles have provided many basic insights into the neuroendocrine control of... (Review)
Review
This article is part of a Special Issue "Puberty and Adolescence". Studies of birds and reptiles have provided many basic insights into the neuroendocrine control of reproductive processes. This research has elucidated mechanisms regulating both early development, including sexual differentiation, and adult neuroendocrine function and behavior. However, phenomena associated with the transition into sexual maturation (puberty) have not been a focus of investigators working on species in these taxonomic classes. Research is complicated in birds and reptiles by a variety of factors, including what can be extended times to maturation, the need to reach particular body size regardless of age, and environmental conditions that can support or inhibit endocrine responses. However, careful selection of model systems, particularly those with available genetic tools, will lead to important comparative studies that can elucidate both generalizability and diversity of mechanisms regulating the onset of reproductive maturity.
Topics: Animals; Birds; Neurosecretory Systems; Reproduction; Reptiles; Sex Differentiation; Sexual Maturation; Time Factors
PubMed: 23998665
DOI: 10.1016/j.yhbeh.2013.05.002 -
Current Opinion in Neurobiology Jun 2016The adolescent transition from childhood to adulthood requires both reproductive and behavioral maturation as individuals acquire the ability to procreate. Gonadal... (Review)
Review
The adolescent transition from childhood to adulthood requires both reproductive and behavioral maturation as individuals acquire the ability to procreate. Gonadal steroid hormones are key players in the maturation of behaviors required for reproductive success. Beyond activating behavior in adulthood, testicular and ovarian hormones organize the adolescent brain and program adult-typical and sex-typical expression of sociosexual behaviors. Testicular hormones organize sexual and agonistic behaviors, including social proficiency-the ability to adapt behavior as a function of social experience. Ovarian hormones organize behaviors related to energy balance and maternal care. These sex differences in the behaviors that are programmed by gonadal hormones during adolescence suggest that evolution has selected for hormone-dependent sex-specific organization of behaviors that optimize reproductive fitness.
Topics: Animals; Gonadal Steroid Hormones; Humans; Mammals; Sex Characteristics; Sexual Behavior; Sexual Maturation
PubMed: 26963894
DOI: 10.1016/j.conb.2016.02.004 -
Journal of Pediatric Nursing 2016
Review
Topics: Adolescent; Adolescent Development; Female; Humans; Male; Menarche; Pediatric Nursing; Puberty; Sexual Maturation
PubMed: 27600163
DOI: 10.1016/j.pedn.2016.08.004 -
Delayed sexual maturation in the female rat during chronic exposure to delta-9-tetrahydrocannabinol.Life Sciences Oct 1984delta-9-Tetrahydrocannabinol (THC), the major psychoactive component of marihuana, retarded sexual maturation in the pubertal female rat as indicated by a delayed...
delta-9-Tetrahydrocannabinol (THC), the major psychoactive component of marihuana, retarded sexual maturation in the pubertal female rat as indicated by a delayed appearance of estrus and ovulation. Twice daily intraperitoneal injections of 10 mg THC/kg body weight from 27 days of age until the first day of full vaginal cornification delayed the onset of estrus and the occurrence of the first ovulation by an average of 4.3 +/- 0.9 (S.E.M.) days in comparison with pair-fed, vehicle-treated animals (p less than 0.001). Ovulation during the first estrus occurred in 92% of the animals in each treatment group without a difference in the average number of ova ovulated. The delayed sexual maturation in animals treated with THC could not be attributed to reduced body weight gain since body weights in THC- and vehicle-treated groups were equivalent when vehicle-treated animals came into estrus. Delayed ovulation in THC-treated animals did not merely reflect the repeated blockade of ovulation from otherwise competent follicles in that the onset of vaginal cornification was delayed to a comparable extent. Rather, the data suggest retarded development of ovarian follicles, possibly as a result of pituitary suppression. It is noteworthy that, although delayed, both vaginal cornification and ovulation occurred in spite of continued THC treatment, suggesting the development of drug tolerance.
Topics: Animals; Body Weight; Dronabinol; Drug Tolerance; Estrus; Female; Pregnancy; Rats; Sexual Maturation; Time Factors
PubMed: 6090846
DOI: 10.1016/0024-3205(84)90268-6 -
The Journal of Pediatrics Jul 2017
Topics: Physicians; Sexual Maturation
PubMed: 28648279
DOI: 10.1016/j.jpeds.2017.05.013