An experiment was done to test the hypothesis that seasonal changes in environment during the first and second 6 months of life influence age at puberty in heifers. Twenty-eight Angus X Holstein heifers, born in March (M) or September (S), were reared under natural conditions until 6 months of age. From 6 to 12 months of age, heifers were reared in environmental chambers programmed to simulate ...

this study was to determine the health knowledge, attitude, and practice of adolescence girls during puberty among 8th grade students in southern part of tehran in 1996-1997. it also addressed the health needs and therefore the necessary steps to be taken to promote adolescent's health. sample study consisted of 225 students, their mothers, and their teachers. each person was interviewed by a...

The authors studied eight sets of healthy twins, ranging in physical maturity from prepubertal to late pubertal, and their parents, to assess psychological changes in early adolescence. A phase-specific psychosocial regression correlates with the biological onset of puberty. We present preliminary findings related to twinship, parental reactions, and longitudinal development, based on detailed ...

Most children explore various aspects of gender and sexuality as children. Youth with consistent, persistent, and insistent gender non-conformity or gender dysphoria are important to identify in the pre- and early-pubertal years as early intervention and support may be lifesaving. Those whose gender non-conformity persists into puberty and adolescence are most likely to identify as transgender....

hypothalamic hamartoma (hh) is a rare intracranial lesion that usually presents with classic triad of central precocious puberty, gelastic epilepsy, and developmental delay. herein, a 14-year old boy is presented in whom the diagnosis of hh was made by magnetic resonance imaging. while he did not have any complain of precocious puberty, he surprisingly suffered from delay in puberty. the defini...