Associations between the detailed milk mineral profile, milk composition, and metabolic status in Holstein cows

• DOI: 10.3168/jds.2022-23161
• Publication Date: 2023-07-20T03:54:23Z
• Authors: Alessandro Toscano; Diana Giannuzzi; Sara Pegolo; Alice Vanzin; Vittoria Bisutti; Luigi Gallo; Erminio Trevisi; Alessio Cecchinato; Stefano Schiavon
• Keywords: 2. Zero hunger; Minerals; 3-Hydroxybutyric Acid; milk mineral profile; Lactose; blood metabolites; SF250.5-275; liver ultrasound; blood metabolites; liver ultrasound; milk composition; milk mineral profile; negative energy balance; Dairying; SF221-250; Milk; Glucose; Pregnancy; negative energy balance; milk composition; Animals; Lactation; Female; Cattle; Dairy processing. Dairy products

The causes of variation in the milk mineral profile dairy cattle during first phase lactation were studied under hypothesis that partially reflects animals' metabolic status. Correlations between minerals and main constituents (i.e., protein, fat, lactose percentages), their associations with cows' status indicators explored. (MET) we used blood energy-protein metabolites [nonesterified fatty acids, β-hydroxybutyrate (BHB), glucose, cholesterol, creatinine, urea], liver ultrasound measurements (predicted triacylglycerol content, portal vein area, diameter depth). Milk samples, taken from 295 Holstein cows belonging to 2 herds 120 d (DIM). contents determined by ICP-OES; these considered response variable analyzed through a mixed model which included DIM, parity, yield, MET as fixed effects, herd/date random effect. traits divided tertiles. results showed protein was positively associated body condition score (BCS) negatively BHB content; fat BCS; Ca, P, K S greatest number energy indicators, particularly BCS, predicted urea. We conclude lactose, reflect adaptation within DIM. Variations consistent changes major cows.