Body and organ growth in the newborn rat.
Body and organ growth were described in rat pups 1 h and 10 days of age. Several organs (e.g., brain and pineal gland) exhibited significant growth in 1-hour-old but not in 10-day-old rats. Further, organs such as the testis and liver showed significant growth in 10-day-old but not 1-hour-old pups. 11 h of exposure to a warming oven, devoid of maternal and nutritional input, significantly influenced the body and organ growth of both newborn and 10-day-old pups. These data show that the first 12 h of life is an active period of growth for the rat.
D000818:Animals; D000831:Animals, Newborn / Q000254:growth & development*; D001835:Body Weight; D001921:Brain / Q000254:growth & development; D005260:Female; D006358:Hot Temperature; D008099:Liver / Q000254:growth & development; D008297:Male; D009929:Organ Size; D010870:Pineal Gland / Q000254:growth & development; D051381:Rats; D011919:Rats, Inbred Strains / Q000254:growth & development*; D013737:Testis / Q000254:growth & development