Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The photophase light intensity does not affect the scotophase melatonin response in the domestic pig
Autore:
Tast, A; Love, RJ; Evans, G; Andersson, H; Peltoniemi, OAT; Kennaway, DJ;
Indirizzi:
Univ Helsinki, Fac Vet Med, Dept Clin Vet Sci, Saarentaus 04920, Finland Univ Helsinki Saarentaus Finland 04920 et Sci, Saarentaus 04920, Finland Univ Sydney, Fac Med Vet, Dept Vet Clin Sci, Camden, NSW 2570, Australia Univ Sydney Camden NSW Australia 2570 in Sci, Camden, NSW 2570, Australia Univ Sydney, Fac Med Vet, Dept Anim Sci, Sydney, NSW 2006, Australia Univ Sydney Sydney NSW Australia 2006 im Sci, Sydney, NSW 2006, Australia Swedish Univ Agr Sci, Fac Vet Med, Dept Clin Chem, S-75007 Uppsala, SwedenSwedish Univ Agr Sci Uppsala Sweden S-75007 hem, S-75007 Uppsala, Sweden Univ Adelaide, Dept Obstet & Gynaecol, Adelaide, SA 5005, Australia Univ Adelaide Adelaide SA Australia 5005 ol, Adelaide, SA 5005, Australia
Titolo Testata:
ANIMAL REPRODUCTION SCIENCE
fascicolo: 3-4, volume: 65, anno: 2001,
pagine: 283 - 290
SICI:
0378-4320(20010330)65:3-4<283:TPLIDN>2.0.ZU;2-3
Fonte:
ISI
Lingua:
ENG
Soggetto:
PLASMA MELATONIN; PROLACTIN; PROFILES;
Keywords:
circadian; rhythm; pig-endocrinology; light intensity; melatonin; seasonal infertility;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Tast, A Univ Helsinki, Fac Vet Med, Dept Clin Vet Sci, Pohjoinen Pikatie 800, Saarentaus 04920, Finland Univ Helsinki Pohjoinen Pikatie 800 Saarentaus Finland 04920 land
Citazione:
A. Tast et al., "The photophase light intensity does not affect the scotophase melatonin response in the domestic pig", ANIM REPROD, 65(3-4), 2001, pp. 283-290

Abstract

This study investigated the effects of the photophase light intensity on the scotophase melatonin response. Twelve, 8-month-old crossbred gilts were allocated to three groups of four and housed in temperature- and lighting-controlled climate rooms. The rooms had a light intensity of 40, 200 or 10,000 lx and a light-dark cycle of 12 L:12 D. The gilts were allowed to acclimatize to a new lighting regimen for 1 week before being sampled at 2 h intervals for 24 h. Following the sampling, pigs were transferred under a different light intensity, allowed to adjust for I week and sampled again, The procedure was repeated three times so that all the groups went through all three lighting regimens (light intensities). All the gilts exhibited a clearcircadian serum melatonin rhythm under each lighting regimen with high melatonin concentrations occurring during the scotophase. There was no difference in the scotophase melatonin response in terms of mean concentrations orduration of increased melatonin levels within or between the groups under different lighting regimens. There was considerable inter-individual variation in the dark phase melatonin response but the individual profiles were consistent under the different lighting regimens. It is concluded that when a certain threshold light intensity (< 40 lx) is exceeded, the photophase light intensity has no effect on the scotophase melatonin response. These results imply that extremely high light intensities during the photophase would provide no additional benefits compared with normal comfortable light intensity, if artificial lighting programs were introduced to commercial piggeries in order to reduce seasonal effects on reproduction. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/12/20 alle ore 14:16:39