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- W1991755963 abstract "The objective was to investigate the effect of different dry cow feeding strategies on the degree of ketonemia postpartum. Epidemiologic studies provide evidence of an association between elevated β-hydroxybutyrate (BHBA) concentrations in postpartum dairy cows and a decreased risk for reproductive success as well as increased risk for several diseases in early lactation, such as displacement of the abomasum and metritis. The plane of energy fed to cows in the prepartum period has been shown to influence ketogenesis and the degree of negative energy balance postpartum. Our hypothesis was that a high-fiber, controlled-energy diet (C) fed during the dry period would lead to a lower degree of hyperketonemia in the first weeks postpartum compared with either a high-energy diet (H), or a diet where an intermediate level of energy would only be fed in the close-up period (starting at 28 d before expected parturition), following the same controlled-energy diet in the far-off period. Hyperketonemia in this study was defined as a blood BHBA concentration of ≥1.2 mmol/L. Holstein cows (n = 84) entering parity 2 or greater were enrolled using a randomized block design and housed in individual tiestalls. All treatment diets were fed for ad libitum intake and contained monensin. Cows received the same fresh cow ration after calving. Blood samples were obtained 3 times weekly before and after calving and analyzed for BHBA and nonesterified fatty acids (NEFA). Milk components, production, and dry matter intake were recorded and energy balance was calculated. Repeated measures ANOVA was conducted for the outcomes dry matter intake, energy balance, BHBA and NEFA concentrations, milk and energy-corrected milk yield, as well as milk composition. Predicted energy balance tended to be less negative postpartum in group C and cows in this group had fewer episodes of hyperketonemia compared with both the intermediate group and group H in the first 3 wk after calving. Postpartum BHBA and NEFA concentrations over time were highest in group H and lowest in group C, whereas milk production was not affected by prepartum plane of energy. Analysis of milk fatty acid composition showed a higher yield of preformed fatty acids in group H compared with group C, suggesting higher lipid mobilization for cows fed H. In this study, a 1-group, controlled-energy dry period approach decreased the degree of negative energy balance as well as the number of episodes and degree of hyperketonemia postpartum." @default.
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- W1991755963 date "1951-06-01" @default.
- W1991755963 modified "2023-10-17" @default.
- W1991755963 title "ACTH In cirrhosis of the liver" @default.
- W1991755963 doi "https://doi.org/10.1016/0002-9343(51)90370-1" @default.
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