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Aim of this study was to investigate the correlation value among testosterone concentrations, libido and sperm quality of Bligon, Kejobong and Ettawa Grade bucks. Samples used were 9 bucks (3 Bligon, 3 Kejobong and 3 PE). Testosterone 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. Data of correlation between testosterones, libido and sperm quality was determined. Results showed that Bligon’s testosterone in the morning was correlated with the first time to sniff (R= -0.79 and Y= 20.91-6.52X), to mount (R= -0.80 and Y= 20.28-7.16X), to ejaculation (R= -0.81 and Y= 14.03-7.56X), sperm volume (R= 0.65 and Y= -0.78+0.03X) and motility of spermatozoa (R= 0.70 and Y= -73.83+1.43X) (P<0.01). Kejobong’s testosterone in the morning was correlated with the first time to sniff (R= -0.75 and Y= 14.96-0.68X), to mount (R= -0.69 and Y= 21.59-0.86X), to ejaculate (R= -0.66 and Y= 28.51-0.83X) and concentration of spermatozoa (R= 0.59 and Y= 430.73+12.75X) (P<0.01), whereas Kejobong’s testosterone in the afternoon was correlated with the first time to sniff (R= -0.90 and Y= 21.50-1.06X), to mount (R= -0,90 and Y= 24.89-1.16X) and to ejaculate (R= -0.84 and Y= 34.27-1.14X) (P<0.01). Testosterone in the afternoon of PE was correlated with the first time to sniff (R= -0.72 and Y= 12.83-7.31X), to mount (R= -0.72 and Y= 9.11-7.67X) and to ejaculation (R= -0.69 and Y= 2.02-8.25X) (P<0.01), spermatozoa viability (R= 0.77 and Y= -90.99+2.20X) and spermatozoa concentration (R= 0.72 and Y= -452.10+9.56X) (P<0.01). It could be concluded that testosterone level was correlated with libido and sperm quality, and there were variations of correlation between breed of bucks.

KORELASI ANTARA HORMON TESTOSTERON, LIBIDO, DAN KUALITAS SPERMA PADA KAMBING BLIGON, KEJOBONG, DAN PERANAKAN ETAWAH