Preliminary observations on diurnal rhythm in the haematological parameters of male African giant rats (Cricetomys gambianus, Waterhouse)

Abstract

The diurnal rhythm of haematological parameters was investigated in the male African giant rat (Cricetomys gambianus, Water house). There was a significant difference (P<0.001) between the values of red blood cell count (RBC) obtained during the day (light phase) and at night (dark phase). The lowest value (RBC) was recorded at 12.00hrs, but showed a gradual increase from 12.00 hrs to 24.00hrs, although the differences were not significant. It reached a peak at 21.00 hrs. The packed cell volume (PCV) showed a progressive decline between 9.00 hrs and 24.00hrs. The value obtained at 24.00 hrs was also significantly lower than the values at 9.00 hrs (P<0.01) and 12.00 hrs (P<0.01). White blood cell count (WBC) gradually decreased during the period of the study. The WBC values obtained at 24.00 hrs were significantly lower than the values at 9.00 hrs (P<0.01) and 12:00 hrs (P<0.02).

Keywords: Diurnal Rhythm, Haematological Parameters, and male African giant rat.

Le rythme duirne des parametres hematologiques a ete observe chez le rat geant d’Afrique (cricetomys ganbienne, maison deau). Il ya eu une difference significante (P<0.05) entre les valeurs de globules rouges (GR) obtenues pendant la journee (phase lumiere) et celles obtenues la nuit (Phase obscure). La valeur la plus base a ete enregistre a 12 Heures et la valeur la plus elevee a 24 Heures avec un niveau de significance de P<0.001. La concentration Hemoglobulaire a ete reduite considerablement (P<0.005) de 9 Heures a 12 Heures. mais a montre une augmentation progressive de 12 Heures a 24 Heures, meme si les differences n’ etaient pas significantes. cette concentration a atteint une valeur maximale a 21 heures. Li Hematocrite a montre une baisse progressive entre 9 heures. Li Hematocrite a montre une baisse progressive entre 9 heures et 24 heures. Les valeurs obtenues en 24 heures etaient significamment tres basse que les valeurs a 9 heures (P<0.01) et 12 heures (P<0.01). Le taux des globules blancs diminuait gradueuement pendant la periode d’analyse. les valeurs obtenues a 24 heures etaient notamment plus basse que les valeurs a 9 heures (P<0.01) et a 12 heures (P<0.01).