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• W2578819860 abstract "Recent studies in mid- and late-lactation dairy cows showed that β-hydroxybutyrate (BHB) infusion had a considerable effect on glucose metabolism and immune response during intramammary lipopolysaccharide challenge. The objective of the present study was to infuse BHB during the dry period and after parturition to investigate the effects of elevated plasma BHB concentrations on metabolism and endocrine changes in transition dairy cows. The hypothesis tested was that regulation of glucose metabolism would change at different physiological stages and an additional elevation of BHB concentration would alter glucose concentration. Multiparous Holstein cows in wk -2 (antepartum, a.p.; n = 6) and wk +2 (postpartum, p.p.; n = 8) relative to calving were infused (4 h from 0800 to 1200 h) with a BHB solution to increase plasma BHB concentration to 1.5 to 2.0 mmol/L (HyperB). The same period the next day without any infusion was considered the control period (CON). Blood samples were taken 1 h before the start of infusion as reference samples and every 30 min during the following 6 h (4 h of infusion and 2 h after infusion) in the HyperB and CON periods, and analyzed for glucose, BHB, insulin, and glucagon concentrations. During the steady state period (the latter 2 h of the 4-h infusion), plasma BHB concentration reached 1.87 ± 0.05 mmol/L (a.p.) and 1.93 ± 0.05 mmol/L (p.p.) in HyperB compared with 0.55 ± 0.06 mmol/L (a.p.) and 0.64 ± 0.04 mmol/L (p.p.) in CON, respectively. The 4-h average BHB infusion rate was 12.4 ± 1.0 and 13.3 ± 0.9 μmol/kg of BW per minute in wk -2 and +2, respectively. Infusion of BHB caused a decrease of plasma glucose concentrations relative to preinfusion levels both before and after parturition, although basal glucose concentrations were different before and after calving. Infusion of BHB increased plasma insulin concentrations a.p. but not p.p., despite a higher basal insulin concentration before than after parturition. These findings show that effects of hyperketonemia on plasma glucose concentrations are similar before and after calving but that endocrine adaptation to hyperketonemia differs before and after parturition. We assume that BHB is a metabolic key regulator in early lactating dairy cows and may affect glucose concentration by further pathways such as gluconeogenesis and altered lipolysis." @default.
• W2578819860 created "2017-01-26" @default.
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• W2578819860 date "2017-03-01" @default.
• W2578819860 modified "2023-10-02" @default.
• W2578819860 title "Elevation of blood β-hydroxybutyrate concentration affects glucose metabolism in dairy cows before and after parturition" @default.
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• W2578819860 doi "https://doi.org/10.3168/jds.2016-11714" @default.
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