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Nycthemeral change of some haematological parameters in horses

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Author(s): Giuseppe Piccione | Francesco Fazio | Elisabetta Giudice | Fortunata Grasso | Massimo Morgante

Journal: Journal of Applied Biomedicine
ISSN 1214-021X

Volume: 3;
Issue: 3;
Start page: 123;
Date: 2005;
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Keywords: Circadian rhythm | haematological parameters | horse

ABSTRACT
Many physiological processes of domestic animals exhibit daily rhythmicity. The goal of the presentstudy was to investigate, in horses, the existence of the daily rhythms of some haematological parameters:red blood cells (RBC), white blood cells (WBC), haemoglobin (Hb), haematocrit (Hct), mean corpuscularvolume (MCV), mean corpuscular haemoglobin (MCH), mean corpuscular haemoglobin concentration(MCHC) and platelets (PLT). Blood samples from 6 Thoroughbred mares were collected at 4-hourintervals for 48 hours (starting at 08:00 hours on day 1 and finishing at 04:00 on day 2) via an intravenouscannula inserted into the jugular vein. ANOVA showed a highly significant effect of time on haemoglobinand on haematocrit, in all the horses, on either day, with p values < 0.05. Cosinor analysis identified theperiodic parameters and their acrophases (expressed in hours) during the 2 days of monitoring. RBC, Hb,Hct and MCV showed nycthemeral variations included between 17.44 and 22.28, which could suggest thehypothetical influence of various exogenous factors.
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