The purpose of this study is to determine the level of breeders' and artificial inseminators' skills on reproductive management, reproductive efficiencies of their beef cows, and the effect of their skills on reproductive managements on the level of reproductive efficiency of their beef cows. The method used in this research is a case study with qualitative approach. The respondents were beef cattle breeders and inseminators. From the results of this study, it is indicated that breeders' knowledge on reproductive management is categorized into lacking. On the other hand, breeders' attitude on Upsus Siwab program is categorized into "agreed", and breeders' skills in implementing reproductive management are categorized into "sometimes". Moreover, inseminators' knowledge on technical artificial insemination (AI) is categorized into "knowing", inseminators' attitudes on AI are categorized into "agreed", and inseminators' skills on technical AI are categorized into -capable‖ and "always". Besides, it is found that 50.9% of Service per Conception is infertile, 47.3% is less fertile, and 1.8% is normal. For the Calving Rate, it is found that 98.2% are categorized into excellent (80%-90%), and the Calving interval value is 100% categorized into optimal (12 months).