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Titolo:
Daily estradiol and progesterone levels relative to laying and onset of incubation in canaries
Autore:
Sockman, KW; Schwabl, H;
Indirizzi:
Washington State Univ, Dept Zool, Pullman, WA 99164 USA Washington State Univ Pullman WA USA 99164 pt Zool, Pullman, WA 99164 USA Washington State Univ, Ctr Reprod Biol, Pullman, WA 99164 USA Washington State Univ Pullman WA USA 99164 od Biol, Pullman, WA 99164 USA
Titolo Testata:
GENERAL AND COMPARATIVE ENDOCRINOLOGY
fascicolo: 2, volume: 114, anno: 1999,
pagine: 257 - 268
SICI:
0016-6480(199905)114:2<257:DEAPLR>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
COPULATION-SOLICITATION DISPLAYS; HATCHING ASYNCHRONY; CLUTCH-SIZE; LUTEINIZING-HORMONE; FEMALE CANARIES; PLASMA-CONCENTRATIONS; MELEAGRIS-GALLOPAVO; NEOTROPICAL PARROT; ANAS-PLATYRHYNCHOS; SERINUS-CANARIUS;
Keywords:
fecal steroid; clutch size; ovulation; Serinus canaria;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
52
Recensione:
Indirizzi per estratti:
Indirizzo: Sockman, KW Washington State Univ, Dept Zool, Pullman, WA 99164 USA Washington State Univ Pullman WA USA 99164 lman, WA 99164 USA
Citazione:
K.W. Sockman e H. Schwabl, "Daily estradiol and progesterone levels relative to laying and onset of incubation in canaries", GEN C ENDOC, 114(2), 1999, pp. 257-268

Abstract

Female birds may optimize reproduction by modifying clutch size and the timing for the onset of incubation. We measured fecal estradiol-17 beta (E) and progesterone (P) in laying canaries to better understand how onset of incubation might regulate clutch size. Both E and P rose sharply to maxima 1 day before the first egg was laid. Thereafter, E steadily declined, but P remained high through 2 days after the first egg was laid, after which both hormones had returned to low levels. Clutch size did not explain variation in E or P output during the laying cycle. When analyzed with respect to onset of incubation, E and, to a lesser extent, P dropped significantly on theday incubation began, irrespective of whether or not females had finished ovulating. We suggest that factors initiating incubation also cause the decline in E production by small follicles, which in turn may inhibit yolk sequestration in large follicles. Further experiments in which onset of incubation is manipulated may reveal the mechanisms by which this behavior regulates clutch size and reproductive output. (C) 1999 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/11/20 alle ore 05:48:59