Reproductive Characteristics of Bali Polled Bull: Study on Libido, Semen Quality, and Sperm Kinematics

Abstract

This study aimed to identify the reproductive characteristics of Bali Polled bulls (libido, semen quality, and sperm kinematics) to enhance breeding and conservation strategies.Semen samples were from three Bali Polled Bulls and one Bali Horned bull.Libido was measured from the bull's approach to the teaser until ejaculation.Semen quality was assessed macroscopically and microscopically, while spermatozoa kinematics were analyzed using Computer-Assisted Sperm Analysis.The study found significant differences in libido, with the horned exhibiting a significantly (P<0.01)faster rate than Polled 3. Still, there was no significant difference between the Horned, Polled 1, and Polled 2. Polled 1 was significantly (P<0.05)faster than Polled 3. In fresh semen quality of Bali cattle bulls, Horned bulls exhibited a significantly (P<0.01)greater semen volume and sperm concentration (P<0.05)compared to Polled 3, with no significant differences between Polled 1 and Polled 2. Semen color, mass motility, consistency, and motility were similar across all bulls (P>0.05).In frozen semen, the Horned bull showed higher progressive motility (P<0.05)than Polled 3, with no significant differences between Polled 1 and 2. Polled 1 and 2 had fewer sperm abnormalities (P<0.05)than the Horned bull, but did not differ significantly (P>0.05) from Polled 3. Sperm kinematics in the Horned bull showed higher VAP and VSL compared to Polled 2 and higher BCF compared to Polled 2 and Polled 3 (P<0.05).In conclusion, Polled Bali bulls exhibit a longer duration of libido, greater variability in fresh semen quality, and lower abnormality rates in frozen semen.

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