This study aimed to determine the effect of adding trehalose of duck egg yolk-tris extender medium on the quality of frozen semen at buffalo. The design used was experimental a Randomized Block Design (RBD) method with 4 treatments and 4 replications as a group. The addition of trehalose (T) with several concentrations in the extender of tris duck-egg yolk as the first treatment, namely the control consisted of egg yolk tris 80% + 20% + 0% trehalose (T0), the second treatment 0.5% (T1), the third treatment % (T2) and the fourth treatment 1.5% (T3). The observed variables included: motility, viability, abnormality, and membrane integrity. The results of this study showed that the addition of trehalose of duck egg yolk-tris had a non-significantly different effect (P>0.05) on the percentage of spermatozoa motility with the average successively at T0,
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