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- W2019937008 abstract "Forages commonly used in dry cow rations contain high K concentrations. This results in a high dietary cation–anion difference (DCAD), which can compromise the calcium homeostasis of periparturient cows. The aim of this study was to determine the effect of 2 types of hay, fed during the prepartum period and differing in their K concentrations, on the peripartum acid–base status and mineral balance of dairy cows. During the prepartum period, the cows of group K33 (n = 6) received a diet based on hay with a high K concentration (33 g/kg of DM), whereas the cows of group K13 (n = 6) received a diet based on hay with a low K concentration (13 g/kg of DM). Both experimental diets were formulated to be isoenergetic and isonitrogenous. After calving, all cows received the same diet based on hay K33. Blood and urine samples were taken on d 14, 7, and 3 before parturition, at parturition, and then daily during the first 8 d after calving. Concentrations of minerals were analyzed in both blood and urine. Creatinine was also measured in urine for the calculation of the mineral:creatinine ratio. The acid–base parameters in blood (pH and HCO3− concentration) and urine (pH, net acid–base excretion, and base–acid quotient) were determined on d 14, 7, and 3 before parturition, at parturition, and on d 1 after parturition. The use of hay K13 reduced the DCAD value of the prepartum diet by half (195 vs. 514 mEq/kg of DM). No significant differences between the 2 groups were observed for blood acid–base indicators or plasma minerals except for the Mg plasma concentration, which tended to be higher in group K13 from d 3 prepartum to d 2 after calving. In group K13, urinary Ca excretion tended to be higher from d 3 prepartum to d 1 after parturition than that in group K33. On d 3 before parturition, urinary pH and net acid–base excretion were significantly lower in group K13 than in group K33. On d 14, 7, and 3 before parturition, base–acid quotient was significantly lower in group K13 than in group K33. In group K13, daily feed intake and hence daily intake of Ca, P, and Mg during d 3 and 4 after parturition were higher than in group K33. The decrease of the DCAD in positive ranges by feeding a low-K hay before parturition induced a reduction of the metabolic alkalotic charge, as observed in acid–base parameters in urine, and increased the availability of Ca and P as a result of higher feed intake at the onset of lactation." @default.
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- W2019937008 date "2009-12-01" @default.
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- W2019937008 title "Effect of different potassium levels in hay on acid–base status and mineral balance in periparturient dairy cows" @default.
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- W2019937008 doi "https://doi.org/10.3168/jds.2009-2449" @default.
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