Figure 1From: Circulating β-endorphin, adrenocorticotrophic hormone and cortisol levels of stallions before and after short road transport: stress effect of different distancesCirculating β-endorphin concentrations (mean ± SD) of stallions before and after short road transport of different distances. Label on X-axis: Groups, Distances (km), number of subjects. Asterisk indicates significant (*P < 0.001) differences vs before. Symbol indicates significant (°P < 0.01) differences vs Group I.Back to article page