background: due to lack of detailed standards of sexual maturity in individuals with intellectual, sensory and motor disability in iran and the importance of timing of onset of puberty in these individuals, a study is necessary. by knowing the onset of puberty, physiologic and behavioral changes can be traced in these people, as well as the potential impact of the puberty on the underlying dise...

this study presents the first details on morphological and histological characteristics of gonads, gonadal development stages and reproductive index of the persian loach, oxynoemacheilus persa (heckel, 1847), an iranian endemic species. sampling was done from april 2010 to april 2011 using electrofishing device and a total of 196 individuals were collected. the gonads of specimens were removed,...

the sexual maturation and spawning period of blood cockle in matang mangrove estuary was studied by naked eye and histological observations of the gonads from july 2010 to april 2011. the high spawning period was from november to february. however, at one station where bottom sediment exhibited a severe reduction in potential of −100 mv lower, immature individuals were common. these results sug...

in this study, 54 five-year-old farmed female beluga at stage ii of sexual maturation were treated with 0 (control), 0.2, 0.4, 0.8 and 1.6 g of dietary soy equol (eq) and genistein (ge) per each kilogram (kg) of diet during a year. blood samples were collected and ovarian biopsy was performed quarterly. results showed that 64.4% of the huso huso sexually matured at eq 0.4 g/kg and reached stage...

objective: to compare the knowledge and attitude regarding pubertal changes among pre – adolescent girls before and after the pubertal preparedness program (ppp) in experimental and comparison group. materials and methods: a quasi experimental (non- equivalent comparison group pretest posttest) design was adopted with 104pre-adolescentgirls (52 in each experimental and comparison group) of age ...

the aim of this study was to investigate the effect of different sport fields, different training levels and their interactive effects on indicators of growth and sexual maturation of adolescent female athletes. the population consisted of all adolescent female athletes (aged 17-9) in gymnastics, volleyball and table tennis in arak city and the sample included 49 gymnasts, 82 volleyball players...

Effects of the social environment on age at sexual maturation are assumed to require direct interactions, such as suppression of subordinates through aggression from dominants. Using green swordtails (Xiphophorus helleri), we demonstrate for the first time that females and males adjust their age at maturation in response to visual cues of male sexual ornamentation in the current environment: fe...

In this study, 54 five-year-old farmed female beluga at stage II of sexual maturation were treated with 0 (control), 0.2, 0.4, 0.8 and 1.6 g of dietary soy equol (EQ) and genistein (GE) per each kilogram (kg) of diet during a year. Blood samples were collected and ovarian biopsy was performed quarterly. Results showed that 64.4% of the Huso huso sexually matured at EQ 0.4 g/kg and reached stage...

Early sexual maturation is considered a serious drawback for Atlantic salmon aquaculture as it retards growth, increases production times and affects flesh quality. Although both growth and sexual maturation are thought to be complex processes controlled by several genetic and environmental factors, selection for these traits has been continuously accomplished since the beginning of Atlantic sa...

Four types of chemosignal donors were used: adult intact males, grouped adult intact females, pregnant females and lactating females. A daily dose of 0.001 ml urine was sufficient to produce the same degree of acceleration or delay known to occur with whole urine from each donor type. With 0.00001 ml the age of puberty did not differ from that of water-treated controls for any of the treatments...