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Nycthemeral change of some haematological parameters in horses

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

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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