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- W4200366018 abstract "Abstract Background: Most of the dairy cows in early lactation suffer from a period of negative energy balance (NEB) and hypocalcemia metabolic disorders. Calcium propionate is a source of energy and calcium for alleviating NEB and hypocalcemia. The objective of the study was to investigate the changes of milk compositions and blood metabolites of postpartum dairy cows fed with calcium propionate for 5 weeks. Methods: Thirty-two multiparous Holstein cows after calving were randomly allocated to control (CON), low calcium propionate (LCaP), medium calcium propionate (MCaP) and high calcium propionate (HCaP) groups with 8 cows per group balanced with parity, milk yield and body weight. The dairy cows in the four groups were oral drenching with 0, 200, 350, 500 g/d calcium propionate per cow from calving to d 35 in early lactation, respectively. Results: The results showed that the milk yield in MCaP group was significantly higher than those in the other groups. At d 35, the somatic cell count (SCC) in MCaP group tended to be lower than those in other groups. Compared with the CON group, serum non-esterified fatty acid (NEFA) in MCaP and HCaP groups tended to decrease. The serum alanine aminotransferase (ALT) concentration in MCaP group was lowest among the four groups. The concentration of aspartate aminotransferase (AST) in HCaP group was significantly higher than the other groups. Feeding calcium propionate had no significant effect on serum calcium, phosphorus and magnesium concentrations. The serum parathyroid hormone (PTH) in HCaP group tended to decrease. The calcium propionate treatments significantly decreased the serum alkaline phosphatase (ALP) level. The MCaP treatment significantly decreased serum total antioxidant capacity (T-AOC), glutathione peroxidase (GSH-Px), superoxide dismutase (SOD) and catalase (CAT) activity, while increased the concentration of malondialdehyde (MDA) when compared with the other groups. The metabolomic results showed that calcium propionate significantly affected the bile acid compositions. Conclusions: It was concluded that the 350 g/d calcium propionate feeding level could significantly improve milk performance, alleviate body fat mobilization and bone calcium utilization, however decrease antioxidant capacity of dairy cows as well. The effect of calcium propionate on milk performance and serum metabolites in early lactation cows may be regulated through the serum bile acids metabolism." @default.
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- W4200366018 date "2021-09-16" @default.
- W4200366018 modified "2023-09-26" @default.
- W4200366018 title "Effects of Calcium Propionate on Milk Performance and Serum Metabolome of Dairy Cows in Early Lactation" @default.
- W4200366018 doi "https://doi.org/10.21203/rs.3.rs-827771/v1" @default.
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