The assesment of reproductive success for dairy cattle by the use of recorded blood biochemical biomarkers and innovative technologies

Purpose: Effective reproduction is essential dairy production, impacting milk yield, production, sustainability, and the general health of animals. Recent technological advancements allow veterinarians to keep track of the herd by measuring activity, milk composition, rumination and estrus. The main goal of the study is to assess the reproductive success in dairy cattle by integrating innovative technologies combined with blood biochemical biomarkers. Material and methods: The study included 100 dairy cows, categorized into five groups of 20, according to their reproductive period. During the study, blood samples were collected and analyzed to assess metabolic readings. The data of animals was retrieved from the herd management program „Lely“ (Netherlands), while disease histories were documented using „DelPro“ (Sweden). Results: The study found that milk yield was 13 % higher in the second group of fresh cows (31–60 days after calving) than in both the first group of recently calved cows (1–30 days after calving) and expecting cows at 99 days (P<0.01). Also a positive correlation was found between the duration of rumination and the amount of milk, noticed by a 40 % increase of rumination among the first group and pregnant cows. (P<0.001). Non­ pregnant cows had the most active aminotransferase enzyme, while dry cows had the lowest, representing a 91 % difference (P<0.001). The highest concentrations of β­ hydroxybutyric acid were recorded in both fresh cow groups, whereas the lowest levels were observed in pregnant and dry cows, with a 376 % difference among the second group of fresh dairy cows and cows in the dry period. Conclusion: Main results, including the correlation with milk yield and rumination, highlight opportunities to improve productivity and advance the sustainability of a dairy farm. The collected data provides important strategies for optimizing dairy herd management, contributing to more efficient and sustainable milk production.