Puberty in gilts is the occurrence of first oestrus and the onset of reproductive capability (usually at between 200 and 220 days of age). It is the combined effect of genetic factors and management factors (including nutrition, boar exposure and season) that contribute to the age at puberty. Consumer demands for leaner pork have lead to genetic selection for increased lean tissue growth rate a...

Effects of pyrazine derivatives on the day of the first opening of the vagina in juvenile female rats were studied. Tetraethyl and 2,5-dimethyl pyrazine caused a significant delay in the first vaginal opening day of juvenile female rats, but no delay was noted in the case of 2,5-diethyl or triethyl pyrazine. These results suggest that tetraethyl and 2,5-dimethyl pyrazine cause delays in the ons...

Biallelic, partial loss-of-function mutations in GNRHR cause a wide spectrum of reproductive phenotypes from constitutional delay of growth and puberty to complete congenital hypogonadotropic hypogonadism. We studied the frequency of GNRHR, FGFR1, TAC3, and TACR3 mutations in nine adolescent and young adult females with clinical cues consistent with partial gonadotropin deficiency (stalled pube...

Primary hypothyroidism usually leads to retardation of linear growth and delay or even arrest of puberty in juvenile patients. In rare cases, pediatric patients with hypothyroidism may present with signs of VanWyk-Grumbach's syndrome (VWGS), which includes juvenile hypothyroidism, delayed bone age and pseudoprecocious puberty. The present study reported on a rare case of VWGS and other complica...

While the contributing role of testosterone to bone health is rather modest compared to other factors such as estradiol levels, male hypogonadism is associated with low bone mass and fragility fractures. Along with stimulating physical puberty by achieving virilization and a normal muscle mass and improving psychosocial wellbeing, the goals of testosterone replacement therapy in male hypogonadi...

Primary hypothyroidism in the juvenile population generally leads to retardation of linear growth and delay or even arrest of puberty. However, in rare conditions, children with long-standing hypothyroidism present with signs of Van Wyk-Grumbach's syndrome (VWGS) which include juvenile hypothyroidism, delayed bone age, and pseudoprecocious puberty. We report a rare case of prepubertal male chil...