The aim of this study is to investigate the effects of different levels of humate addition to colostrum quality, milk composition, somatic cell count, some blood metabolites and reproductive performance in the period from prepartum 40thto postpartum 60thday. In this study, dairy cows from prepartum 40thto postpartum 60thday were given humate additive which was according to dosed on dry matter consumption basis from (75 g, 150 g). In the study, 26 Swiss Brown cows in the same care and feeding conditionswere used in the second lactation. The feeds were weighed to determine the dry matter intake of the individual cows daily. Blood was collected from the vena jugularis at 40, 30, 20 and 10 days before the estimated date of birth, at calving (day 0) and on days 5, 10, 20, 30, 45, and 60 after birth. Colostrum and milk samples were taken in the study. As a result of the study, it has been determined that the use of humate additives has no effect on body condition score, body weight, in milk non-fat milk solid, density, protein, lactose, freezing point, somatic cell count, in blood triglicerides, phosphorus, magnesium, albumin, glucose, blood urea nitrogen. It was foundthat with the addition of humate additive to the feed, colostrum specific gravity increased,prepartum and postpartum dry matter intake increased, milk yield and the fat percentage increased, serum non-esterified fatty acid and blood beta-hydroxybutyric acid levels decreased, and postpartum serum calcium level increased.It was concluded that 75 g of humate, which is determined based on dry matter consumption, can be added to the rations of the dairy cows at this dose and has positive effects on colostrum quality, milk yield, milk fat ratio, and negative energy balance.