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    Characteristics and Kinematics of Bali Bull Sperms after Thawing Using Tris Soy Lecithin

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    Soy functions as an extracellular cryoprotectant, which can maintain the integrity of spermatozoa cell membranes with its main content is lecithin. Lecithin from soybeans protects sperm cells from cold stress and reduces the effects of oxidative stress during cryopreservation. This study aimed to analyse the effect of various levels of lecithin diluent on the quality of Bali bull semen during cryopreservation. Semen collection of Bali bull was carried out once a week during four times consecutively using an artificial vagina. The semen was then diluted using the essential ingredient Tris Aminomethan with the addition of powdered soy lecithin; P1 (1 %), P2 (3 %) and P3 (5 %), respectively. Andromed® (K1) as a positive control and Tris without soy lecithin (K2) as a negative control. The parameters observed were motility, progressive motility, kinematics, viability, membrane integrity, and acrosome integrity. The results of this study showed that the dilution of semen with soy lecithin before and after thawing the semen quality was not significantly different (P< 0.05) in motility, viability, plasma membrane integrity, and acrosome integrity. Meanwhile, the kinematics of VAP, VCL, VSL, DAP, DCL, and DSL showed that the average quality increased at P3 compared to K1, K2, P1, and P2, which decreased after thawing or were significantly different (P< 0.05). It can be concluded that Bali bull semen diluted with 3% and 5% of tris soy lecithin produces good characteristics and kinematics, can protect spermatozoa from cold shock