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Titolo:
Differential effects of meal size and food energy density on feeding entrainment in goldfish
Autore:
Sanchez-Vazquez, FJ; Aranda, A; Madrid, JA;
Indirizzi:
Univ Murcia, Fac Biol, Dept Physiol & Pharmacol, E-30100 Murcia, Spain Univ Murcia Murcia Spain E-30100 siol & Pharmacol, E-30100 Murcia, Spain
Titolo Testata:
JOURNAL OF BIOLOGICAL RHYTHMS
fascicolo: 1, volume: 16, anno: 2001,
pagine: 58 - 65
SICI:
0748-7304(200102)16:1<58:DEOMSA>2.0.ZU;2-A
Fonte:
ISI
Lingua:
ENG
Soggetto:
LOCOMOTOR-ACTIVITY; ANTICIPATORY ACTIVITY; CIRCADIAN OSCILLATOR; ACTIVITY RHYTHMS; MELATONIN; LIGHT; FISH; RATS;
Keywords:
feeding anticipatory activity; dietary energy; circadian rhythms; activity rhythms; diluted diets; Carassius auratus;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Life Sciences
Citazioni:
23
Recensione:
Indirizzi per estratti:
Indirizzo: Sanchez-Vazquez, FJ Univ Murcia, Fac Biol, Dept Physiol & Pharmacol, E-30100 Murcia, Spain Univ Murcia Murcia Spain E-30100 30100 Murcia, Spain
Citazione:
F.J. Sanchez-Vazquez et al., "Differential effects of meal size and food energy density on feeding entrainment in goldfish", J BIOL RHYT, 16(1), 2001, pp. 58-65

Abstract

The synchronizing stimulus, its transduction site, and the afferent pathways responsible for feeding entrainment remain unknown. In fish, the role ofthe diet in the development of feeding anticipatory activity (FAA) is not well understood and fundamental questions on the mechanisms of feeding entrainment, such as the meal characteristics required to develop FAA, remain unexplored. To test the entraining properties of daily meals with different sizes and energy densities, activity rhythms were studied after a 12-h shift of the feeding cycle in individual goldfish under constant light. In the Ist experiment, the energy content of a control diet (16.7 kJ/g) was diluted by replacing 50% (8.3 kJ/g) or 90% (1.7 kJ/g) of the diet with cellulose. However, the number of days required to stabilize FAA after the shift did not differ statistically between diets. In the 2nd experiment, meal size was modified by reducing the daily feeding ration to 0.5% and 0.1% b.wt.d(-1). In this case, differences in the entraining properties of the two feedingrations appeared because goldfish fed at 0.1% b.wt.d(-1) resynchronized faster than those fed at 0.5% b.wt.d(-1). These results revealed that the dilution of the dietary energy up to 1.7 kJ/g had no significant effect on theentraining properties of the feeding-entrainable oscillator (FEO), whereasthe reduction of the meal size to 0.1% b.wt.d(-1) provoked a faster resynchronization after shifting the daily meal cycle. Taken together, these results suggest that gut distension may be involved in feeding entrainment, as a reduction in meal size but not in the amount of dietary energy supplied significantly shortened the time required for resynchronization and highlighted the different synchronizing properties of meal size and energy density as zeitgebers for the FEO.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 05/04/20 alle ore 08:10:32