The present study aimcd at investigating the biological evaluation of ii synbiotic fermented milk synergistic with some active ingredients of herbal hydrosols and honey on the sexual activity, semen characteristics and testosterone levels in .tuadhi and Damascus goal's bucks. A synbiolic syrup was prepared by mixing fermented cow's milk containing some probiotic strains and natural antioxidants isolated from functional food and herbal hydrosols_ fifteen Damascus and Aradhi bucks were utilized in the c-_-xperirnent Two bucks served as control (given DO Sylibi01iC). 7 bucks were designed to be orally given twenty ml of the mixture three times per week for E C-OrLieCtitiVe weeks (Low dose, Aradhi-Low = AL, Damascus-Low = DL) and 6 bucks were orally given 40 mL of the mixture (High dee, Aradia-High ML Damascus-High = DH) by the same reorne_ Bucks were tested for the libido and semen ejaculates were collected once a week for teaing the physical characteristics. A imular blood sample WU taken once a week in a non-Ixparinzed rube for the determinations of serum testosterone! Amine and aspartatc. Amino transarrrinas..-_-s (ALT and AST), urea -and ereatirune levels. Results indiead a significant enhancement of the libido due to the breed of the buck; Aradhi bucks exhibited less reaction time than Darna SCUS bucks (p