Table 4 Correlation matrix between oxidative profile and proteolysis regulator parameters in the seminal plasma, semen parameters and sperm kinetics in donkey stallions (n = 9).

From: Oxidative profile and protease regulator potential to predict sperm functionality in donkey (Equus asinus)

 

Osm

Vol

Conc

Prod

Tot mot

Prog

VCL

VSL

VAP

FRAP

–

–

 + 0.811**

 + 0.738**

 + 0.686*

 + 0.684*

 + 0.651*

 + 0.629*

 + 0.591†

TAC

–

 + 0.578†

 + 0.810**

 + 0.787**

 + 0.785**

 + 0.704*

 + 0.737**

 + 0.640*

 + 0.647*

FRSA

−0.524†

–

 + 0.873***

 + 0.824**

–

–

–

–

–

TTL

–

–

 + 0.905***

 + 0.864***

–

–

 + 0.510†

–

–

TOS

–

 + 0.822**

–

–

–

–

–

–

–

NOx

–

−0.745**

−0.636*

−0.738**

−0.811**

−0.670*

−0.878***

−0.784**

−0.837***

AOPP

–

–

 + 0.844**

 + 0.784**

 + 0.656*

–

 + 0.611†

 + 0.535†

 + 0.544†

PA

–

–

 + 0.660†

–

–

–

–

–

–

APA

–

–

 + 0.987***

 + 0.873***

 + 0.580†

–

 + 0.578†

–

 + 0.528†

TP

–

–

 + 0.876***

 + 0.730*

–

–

–

–

–

  1. FRAP: ferric reducing ability of plasma; TAC: total antioxidant capacity; FRSA: free radical scavenging activity; TTL: total thiol levels; TOS: total oxidant status; NOx: nitric oxide metabolites; AOPP: advanced oxidation protein products; PA: protease activity; APA: antiprotease activity; TP: total protein; Osm: osmolarity; Vol: volume; Conc: sperm concentration; Prod: sperm production; Tot mot: total sperm motility; Prog: progressive sperm motility; VCL: curvilinear velocity; VSL: straight-line velocity; VAP: average path velocity. *, **, ***: indicate a statistic significance for P < 0.05; P < 0.01 and P < 0.001, respectively; †: indicate a tendency for P < 0.10.
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