Light Regulation of Sexual Activity in the Male Sparrow (Passer domesticus)

Autor:	Gardner M. Riley
Rok vydání:	1936
Předmět:	Zosterops palpebrosa Early winter Sparrow biology biology.animal Starling Seasonal breeder Zoology Quiescent period biology.organism_classification Passer Junco General Biochemistry Genetics and Molecular Biology
Zdroj:	Experimental Biology and Medicine. 34:331-332
ISSN:	1535-3699 1535-3702
DOI:	10.3181/00379727-34-8609p
Popis:	The importance of light as a regulating factor of the sexual cycle in birds has been demonstrated by Rowan1 (junco), Bissonnette2 (European starling), Miyazaki3 (Zosterops palpebrosa) and Kirschbaum4 (English sparrow). These investigators have observed a precocious development of the testes following daily increases in the period of illumination. Such experiments were usually carried out during the early winter. The present author has undertaken to determine whether lengthened daily periods are equally effective at a time further removed from the normal breeding season. In this paper, a group of male sparrows, exposed to additional light beginning November 18th, is compared with another group first exposed on September 30th.The November group of sparrows had been in the laboratory 16 days previous to the artificial lengthening of the days and all possessed the horn-brown bill of the sexually quiescent period. The birds received 4 1/2 additional hours of light, daily, from a 100-watt incandescent bulb thro...
Databáze:	OpenAIRE
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