Variations in haematological and biochemical parameters in healthy ponies

Witkowska-Piłaszewicz, Olga; Cywińska, Anna; Michlik-Połczyńska, Katarzyna; Czopowicz, Michał; Strzelec, Katarzyna; Biazik, Anna; Parzeniecka-Jaworska, Marta; Crisman, Mark; Witkowski, Lucjan

doi:10.1186/s12917-020-02741-5

BMC Veterinary Research

Table 2 Hematological parameters in ponies class A, Felin ponies and Polish Koniks compared with so far published reference intervals for various types of horses (according to ¹Rossdale & Partners, 2011 [5], ²Weiss & Wardrop, 2010 [7], ³Hinchcliff & Geor, 2013 [1])

From: Variations in haematological and biochemical parameters in healthy ponies

Parameter^a	Ponies class A (n = 73)	Felin ponies (n = 28)	Polish Koniks (n = 41)	General linear model p-value for the effect of				Reference intervals
Parameter^a	Ponies class A (n = 73)	Felin ponies (n = 28)	Polish Koniks (n = 41)	groups	sex	age^c	group & sex interaction	“hot-blooded” horses	“cold-blooded” horses	American Miniature Horses
RBC [T/L]	7.4 ± 1.0 (5.6–11.5)	7.9 ± 1.0 (6.3–10.7)	7.7 ± 0.9 (6.0–10.0)	0.201	0.609	< 0.001 −0.41 (− 0.58, − 0.24)	0.686	8.2 (6.2–10.2)¹	5.5–9.5²	4.7–9.4²
HGB [mmol/L]	6.9 ± 0.9 (4.9–9.3)	7.1 ± 0.7 (6.0–8.4)	7.0 ± 0.6 (5.5–8.4)	0.466	0.883	0.927	0.673	8.4 (6.9–9.9)¹	4.96–8.69²	5.52–10.12²
HCT [l/l]	0.35 ± 0.04 (0.30–0.50)	0.36 ± 0.03 (0.30–0.40)	0.35 ± 0.03 (0.30–0.40)	0.417	0.999	0.645	0.565	0.37 (0.31–0.43)¹	0.24–0.44²	0.24–0.44²
MCV [fL]	46.9 ± 3.4 (36–55)	46.0 ± 3.8 (37–52)	46.0 ± 3.4 (39–51)	0.355	0.172	< 0.001 0.75 (0.61, 0.88)	0.126	46 (40.0–50.0)¹		37–58²
MCH [fmol]	0.92 ± 0.07 (0.7–1.1)	0.91 ± 0.07 (0.7–1.0)	0.91 ± 0.07 (0.8–1.0)	0.336	0.170	< 0.001 0.66 (0.51, 0.80)	0.809	1.03 (0.94–1.18)¹		0.81–1.43²
MCHC [mmol/L]	1.97 ± 0.06 (1.8–2.1)	1.97 ± 0.07 (1.8–2.1)	1.98 ± 0.06 (1.8–2.1)	0.788	0.490	0.015 −0.22 (−0.40, −0.04)	0.025	2.38 (2.07–2.40)¹		2.17–2.48²
WBC [G/L]	7.1 ± 1.2 (4.5–10.7)	6.8 ± 1.4 (4.0–10.4)	7.5 ± 1.1 (5.5–10.3)	0.383	0.667	0.007 −0.24 (− 0.42, − 0.07)	0.197	7.5 (6.0–10.0)¹	6.0–12.0² 3.9–12.4³	5.0–14.97² 10 ± 2.5³
GRA [G/L]	2.2 ± 0.7 (1.2–4.2)^A	1.8 ± 0.5 (1.2–3.8)^A	3.0 ± 0.7 (1.7–4.8)^B	< 0.001	0.566	0.001 0.25 (0.10, 0.39)	0.774	4.4 (3.4–5.4)¹	2.6–7.2³	3.7 ± 0.8³
LYM [G/L]	4.0 ± 1.0 (2.3–8.4)^A	4.3 ± 1.1 (1.9–6.7)^A	3.6 ± 0.9 (2.0–5.6)^B	< 0.001	0.704	< 0.001 −0.56 (− 0.71, − 0.41)	0.177	2.6 (2.0–3.2)¹	0.89–3.6⁴	5.9 ± 0.9³
MON [G/L]	0.9 ± 0.3 (0.3–1.5)	0.8 ± 0.2 (0.4–1.2)	0.9 ± 0.2 (0.6–1.5)	0.037^b	0.426	< 0.001 0.36 (0.19, 0.52)	0.824	0.3 (0.2–0.4)¹	0–0.62⁴	0.04 ± 0.08³
PLT [G/L]	277, 196–364 (95–900)^A	435, 314–701 (181–900)^B	403, 358–476 (116–900)^B	< 0.001	0.981	0.453	0.452	156 (100–250)¹

RBC Number of red blood cells, HGB Haemoglobin concentration, HCT Haematocrit, MCV Mean corpuscular volume, MCH Mean corpuscular haemoglobin, MCHC Mean corpuscular haemoglobin concentration, WBC Number of white blood cells, GRA Number of granulocytes, LYM Number of lymphocytes, MON Number of monocytes, PLT Number of platelets
^a presented as arithmetic mean ± SD and range in parenthesis except for PLT which was non-normally distributed and presented as the median, interquartile range (IQR) and range in parenthesis
^b despite significant result of the omnibus test, pairwise comparisons were insignificant
^c standardized regression coefficient with 95% confidence interval (CI 95%) presented if significant
^A-C groups marked by different capital letters differ significantly in between-group pairwise comparisons at α = 0.05

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