Abstract This study was conducted to observe Bali cows’ primipara reproductive performance between natural mating and artificial insemination. Fifty cows owned by 44 farmers in Central Lombok Regency, West Nusa Tenggara Province, were used as the research sample at first mating; 19 subjected (NM) 31 insemination (AI). Farmer’s profile data, rearing system, (the age of puberty, mating, gestation...