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Article Dans Une Revue Biological Rhythm Research Année : 2002

Effect of the ageing on the circadian activity in selected Japanese quail

Résumé

Our aim was to study the age-related changes of the rhythm of feeding activity in sexually inactive Japanese quail, Coturnix japonica. For that, we recorded the feeding activity of 16 birds maintained in constant darkness during a fortnight, when they were 1 month old. and when they were 19+/-3 months old. We used birds from selected lines in order to test individuals of rhythmic and arrhythmic phenotypes. Three parameters were studied: the period. the clarity of the rhythm and the level of activity. All the birds kept the same circadian phenotype during the both recordings. For the rhythmic birds, the circadian period of feeding activity weakly lengthened, but this increase was not statistically significant. For all the birds, the clarity of the circadian rhythm and the level of activity per cycle decreased significantly with ageing. We found a positive relation between the ratios of the correlation coefficients of circadian activity, expressing the clarity of the rhythm, when the birds were young and older. So, it seems that a basic decrease of clarity as well as of level of activity, though these two parameters are not directly linked, take place with ageing. The results are discussed in terms of causal and functional aspects of circadian rhythm of feeding activity.
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hal-01308874 , version 1 (28-04-2016)

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Sophie Lumineau, Catherine Guyomarc'H. Effect of the ageing on the circadian activity in selected Japanese quail. Biological Rhythm Research, 2002, 33 (1), pp.15--22. ⟨10.1076/brhm.33.1.15.1326⟩. ⟨hal-01308874⟩
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