INSANITY AT PUBERTY

Nutritional rickets at puberty.

Moncrieff, M. W., Lunt, H. R. W., and Arthur, L. J. H. (1973). Archives of Disease in Childhood, 48, 221. Nutritional rickets at puberty. Four adolescent Asians with vitamin D deficiency rickets were seen in Derby in the 5 years 1967 to 1971. They had an extremely low intake of vitamin D, and this, combined with the extra metabolic demands of puberty, was judged to be the main cause of the rick...

Growth at puberty.

Somatic growth and maturation are influenced by a number of factors that act independently or in concert to modify an individual's genetic potential. The secular trend in height and adolescent development is further evidence for the significant influence of environmental factors on an individual's genetic potential for linear growth. Nutrition, including energy and specific nutrient intake, is ...

Insanity

Changes in the male voice at puberty.

The changes in the male voice in relation to the biological characteristics of puberty were assessed longitudinally in 26 boys. Speaking and singing fundamental frequencies were analysed in relation to the Tanner staging of puberty, saliva testosterone levels, and the Cooksey classification of voice analysis. There were abrupt changes in voice characteristics between Tanner stages G3 and G4 and...

Photoperiod influences age at puberty of heifers.

Two experiments were conducted to determine if exposure of prepubertal heifers to supplemental lighting hastens the onset of puberty. In Exp. 1, 16 heifers were paired according to birth date (April 21 to July 4) and assigned randomly to exposure to either 18 h light/d (L) or natural photoperiods (N) from 22 wk of age until puberty. Twenty-two heifers in Exp. 2, born between February 27 and Mar...