Data/hora: 25/04/2024 19:28:50

Biblioteca(s): 	Embrapa Caprinos e Ovinos.	
Data corrente: 	14/03/2017	
Data da última atualização: 	14/03/2017	
Autoria: 	MAEDA, K.; MORI, Y.; SAWASAKI, T.	
Título: 	Diurnal changes in peripheral melatonin concentration in goats and effects of light or dark interruption.	
Ano de publicação: 	1984	
Fonte/Imprenta: 	Japanese Journal of Veterinary Science v. 46, n. 6, p. 837-842, Oct. 1984.	
Idioma: 	Inglês	
Conteúdo: 	Abstract: Diurnal changes in peripheral plasma concentrations of melatonin (MLT) and effects of 2 h light exposure during the nighttime and 2 h dark exposure during the daytime on MLT concentrations in goats were examined in natural lighting condition. Two breeds of goats, the Saanen goat as a seasonal breeder at the breeding season, and the Shiba goat as a non-seasonal one, were used while they were at luteal phase. Plasma concentrations of MLT showed a marked diurnal change in both breeds of goats, which was high during the nigttime (20-120 pg/ml) and low during the daytime (< 20 pg/ml). Light exposure during the nighttime (for 2 h) caused an abrupt decline in plasma concentrations of MLT to the basal level, and, when the light was turned off, plasma MLT began to increase. On the contrary, 2 h dark treatment during the daytime did not induce a rapid increase in plasma MLT as observed at the onset of the night. The pattern and the magnitude of the nocturnal elevation in plasma MLT and the responses to the dark or light interruption were virtually identical between the 2 breeds. The secretion of MLT in goats is driven by the endogenous rhythm, though the lighting stimulus temporarily suppresses the MLT secretion.	
Palavras-Chave: 	Melatonina.	
Thesagro: 	Caprino.	
Thesaurus Nal: 	Goats; Melatonin.	
Categoria do assunto: 	L Ciência Animal e Produtos de Origem Animal	
Registro original: 	Embrapa Caprinos e Ovinos (CNPC)	
Exemplares: 	CNPC - (33097-1) - ADD - AP - PP -  -  -  - DIS