Articles | Volume 51, issue 1
10 Oct 2008
 | 10 Oct 2008

Characteristic of selected rheological parameters of stallion ejaculate

L. Severa, L. Máchal, I. Křivánek, M. Machatková, and O. Mamica

Abstract. Dynamic viscosity of native (30 minutes after ejaculation) and 24 hours stored (at 4 °C) stallion ejaculate was measured. The ejaculate from 10 breeding stallions was examined in three different experimental series. The average value of dynamic viscosity at shear rate 1.02 s−1 was found to be 416.8 ± 10.1 mPa.s. The correlation between ejaculate volume, sperm concentration and viscosity was tested. The experiments resulted in finding a dependence between increasing viscosity and decreasing sperm concentration (rp = −0.67; P<0.05). Performed experiments with changing shear rate demonstrated non-Newtonian characteristics of stallion ejaculate with a clear shear-thinning behaviour. Stallion ejaculate appeared to be slightly time-dependent liquid.