Cold-induced changes in circulating levels of catecholamines and thyroid hormones are modulated by energy intake in newborn pigs.
Newborn pigs were kept at a low ambient temperature from 6 until 54 h of age and supplied with a limited (LI, 415 g (kg body weight)-1) or a high (HI, 655 g (kg body weight)-1) intake of milk. At the end of the treatment, both groups had similar deep body temperatures and metabolic rates. However, plasma adrenaline and noradrenaline levels were, respectively, 5.8- and 3.0-fold lower (P < 0.01) in HI than LI piglets, whereas plasma 3,5,3'-triiodothyronine (T3) was 1.5-fold higher (P < 0.01) in HI piglets. It is concluded that the hormonal control of cold-induced thermogenesis is modulated by energy intake, with catecholamines and thyroid hormones acting in a closely related and complementary manner.
INRA, Station de Recherches Porcines, St-Gilles, France.
P
P
Herpin
D
D
Berthon
R
R
Bertin
F
F
De Marco
M J
MJ
Dauncey
J
J
Le Dividich
D000375:Aging / Q000378:metabolism / Q000502:physiology; D000818:Animals; D000831:Animals, Newborn / Q000502:physiology*; D001831:Body Temperature / Q000502:physiology; D001833:Body Temperature Regulation / Q000502:physiology; D002395:Catecholamines / Q000097:blood*; D003080:Cold Temperature; D004435:Eating / Q000502:physiology; D004734:Energy Metabolism / Q000502:physiology*; D013552:Swine; D013963:Thyroid Hormones / Q000097:blood*
D002395:Catecholamines; D013963:Thyroid Hormones