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Titolo:
The pattern of melatonin secretion is rhythmic in the domestic pig and responds rapidly to changes in daylength
Autore:
Tast, A; Love, RJ; Evans, G; Telsfer, S; Giles, R; Nicholls, P; Voultsios, A; Kennaway, DJ;
Indirizzi:
Univ Helsinki, Fac Vet Med, Dept Vet Clin Sci, Saarentaus 04920, Finland Univ Helsinki Saarentaus Finland 04920 in Sci, Saarentaus 04920, Finland Univ Sydney, Fac Vet Sci, Dept Vet Clin Sci, Camden, NSW, Australia Univ Sydney Camden NSW Australia pt Vet Clin Sci, Camden, NSW, Australia Univ Sydney, Fac Vet Sci, Dept Anim Sci, Camden, NSW, Australia Univ Sydney Camden NSW Australia , Dept Anim Sci, Camden, NSW, Australia Elizabeth MacArthur Agr Inst, Camden, NSW, Australia Elizabeth MacArthur Agr Inst Camden NSW Australia Camden, NSW, Australia Univ Adelaide, Dept Obstet & Gynaecol, Adelaide, SA 5001, Australia Univ Adelaide Adelaide SA Australia 5001 ol, Adelaide, SA 5001, Australia
Titolo Testata:
JOURNAL OF PINEAL RESEARCH
fascicolo: 4, volume: 31, anno: 2001,
pagine: 294 - 300
SICI:
0742-3098(200111)31:4<294:TPOMSI>2.0.ZU;2-S
Fonte:
ISI
Lingua:
ENG
Soggetto:
SERUM CONCENTRATIONS; PLASMA MELATONIN; PREPUBERTAL GILTS; LIGHT-INTENSITY; NOCTURNAL RISE; PROLACTIN; PROFILES; CORTISOL; LONG; SOW;
Keywords:
circadian; domestic pig; lighting; melatonin; seasonal infertility;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Tast, A Univ Helsinki, Fac Vet Med, Dept Vet Clin Sci, Pohjoinen Pikatie 800, Saarentaus 04920, Finland Univ Helsinki Pohjoinen Pikatie 800 Saarentaus Finland 04920 land
Citazione:
A. Tast et al., "The pattern of melatonin secretion is rhythmic in the domestic pig and responds rapidly to changes in daylength", J PINEAL R, 31(4), 2001, pp. 294-300

Abstract

The aim of the study was to investigate the capability of pigs to respond to abrupt changes in lighting conditions by means of alterations in circadian melatonin profiles. Sixteen pre-pubertal crossbred male pigs weighing 40-45 kg were housed in individual pens in four temperature- and lighting-controlled climate rooms (four pigs per room). In two rooms there was a light-dark cycle of 16 L:8 D (Group A) and in two other rooms 8 L:16 D (Group B). Under both lighting regimens light intensity at pig eye-level was 220-240 1x during the light phase and less than 7 1x (red light) during the dark phase. The lighting regimens were changed after 2 wks to the opposite regimenand the change was repeated after a further 2 wks, so that animals ended up with the same light cycle with which they started. Blood was sampled at 2-hr intervals for 48 hr spanning each time of change in lighting. A further24-hr sampling was performed at the end of the experiment (2 wks after thelast change) in both groups and 1 wk after the change from short to long day lighting in Group A. On 83/86 occasions, pigs exhibited a clear circadian rhythm in plasma melatonin under both lighting regimens. Pigs responded immediately to the change from long to short day lighting by advancing melatonin secretion to the earlier lights-off time and some pigs were able to extend secretion to the delayed lights-on time. For short to long day changeover there was a small immediate response, with secretion pattern following the previously entrained endogenous rhythm to within 3 hr of the previous lights-on time. After 1 wk commencement of secretion was delayed by up to 2 hr. while after 2 wks some pigs were able to delay commencement of secretion until lights-off or to cease at lights-on. It is concluded that the domestic pig is able to commence adjustment to abrupt changes in photoperiod within a 1-wk acclimatization by altering circadian melatonin secretion. The present study suggests that it may be possible to use simplified lighting regimens instead of stepwise changing lighting programs in commercial piggeries to reduce the influence of season on production.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 17:36:04