| Summary: | The aim of the study was to investigate the comparison and correlation among testosterone concentrations, libido, and sperm quality of Bligon, Kejobong, and Etawah cross-bred (PE) bucks at the similar of age, feed, and season. Samples used were 9 bucks (3 Bligon, 3 Kejobong, and 3 PE) in ±18 months of age. Testosterones was measured by enzyme-linked immunosorbent assay (ELISA) method. Libido observation were quantified at the first time to sniff, mount, and finally ejaculation. Sperm was collected by using artificial vagina, and correlation between testosterones, libido, and sperm quality was measured. Results showed that Kejobong�s testosterone in the morning (12.00±6.56 ng/ml) was significantly different with PE (6.82±4.18 ng/ml) (P�0.05), whereas Bligon�s testosterone in the morning (9.23±4.73 ng/ml) was similar with Kejobong and PE. The best time of Kejobong�s libido was in the morning (6.77±5.96
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