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Aims: The purpose of this study was to determine the percentage value of spermatozoa acrosome integrity with the addition of gentamicin and sweet orange essential oil on the tris yolk extender on Simmental bull liquid semen. Methodology: The material that was used in this research included Simmental bull fresh semen, tris yolk extender, gentamicin, and sweet orange essential oil. Tris yolk extender prepares with Tris (hydroxymethyl) aminomethane (3.32 g), citric acid (1.86 g), fructose (1.37 g), glycerol (6 ml), egg yolk (20 ml), aqua dest (100 ml). The experimental design used in the study was a nonfactorial Complete Randomized Design with five treatments and five replications. The treatments comprised the addition of sweet orange essential oil at 0%, 0.25%, 0.5%, 0.75% and 1% inclusion levels. The parameter observed was the evaluation of the percentage value of acrosome integrity before and after equilibration equilibration. Results: The results showed that the percentage value of acrosome integrity in spermatozoa linearly increased along with the addition of sweet orange essential oil. The addition of sweet Original Research Article Sitepu and Marisa; AJARR, 9(3): 1-5, 2020; Article no.AJARR.56294 2 orange essential oil had a very significant effect (P <0.01) on the percentage of spermatozoa acrosome integrity in Simmental bull liquid semen. The percentage of acrosome integrity on the addition of 0% (P0) sweet orange essential oil is 60%, the addition of 0.25% (P1) is 64%,the addition of 0.5% (P2) is 67%, the addition of 0.75% (P3) is 69%, and the addition of 1% (P4) is 73%. Conclusion: The addition of 1% (P4) sweet orange essential oil can increase the value of acrosome integrity on spermatozoa, which subsequently improve the quality of Simmental bull liquid semen.

Acrosome Integrity Spermatozoa Test with Addition of Gentamicin and Sweet Orange Essential Oil in Simmental Bull Liquid Semen