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- W2015930048 abstract "The objective of this study was to evaluate the effect of supplementing high levels of vitamin D 3 to steers fed barley-grain-based finishing diets on Ca metabolism. Fifteen Hereford steers (607 ± 12 kg) were individually penned and fed at 0800 and 1600 with a ration consisting of 90% barley-grain-based concentrate and 10% barley silage [dry matter (DM) basis]. Steers were randomly assigned to one of three treatments: 0, 2.5 or 5 million IU (MIU) of vitamin D 3 steer -1 d -1 for 7 d. Daily blood samples were obtained for measurement of serum for total and ionized Ca, parathyroid hormone (PTH) and calcitonin and plasma for vitamin D 3 and 25(OH)D 3 . Data were analyzed by repeated measures analysis and single degree of freedom contrasts. Feed intake was depressed relative to control animals by 18 and 37% for the 2.5 and 5 MIU D 3 treatments, respectively. Relative to controls, total and ionized Ca increased (P < 0.05) by 8 and 19% and 6 and 18% for the 2.5 and 5 MIU D 3 treatments, respectively. Serum PTH concentrations were reduced (P < 0.05) by vitamin D 3 feeding with the greatest reduction seen with animals fed the 5 MIU treatment. Calcitonin values were not (P > 0.05) affected. Relative to controls, plasma vitamin D 3 concentrations increased (P < 0.05) in a quadratic fashion over time with vitamin D 3 supplementation, while that of 25(OH)D 3 increased (P < 0.05) in a linear fashion. It was concluded that the increase in serum calcium was stimulated by a rise in plasma vitamin D 3 and the resulting increased 25(OH)D 3 concentrations, which have been shown to influence calcium absorption either directly or via induced synthesis of 1,25(OH) 2 D 3 . Key words: Calcium homeostasis, vitamin D 3 , cattle, beef tenderness" @default.
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- W2015930048 date "2004-03-01" @default.
- W2015930048 modified "2023-10-17" @default.
- W2015930048 title "Effect of supplementing high levels of vitamin D3 on calcium homeostasis of steers fed barley-based finishing diets" @default.
- W2015930048 doi "https://doi.org/10.4141/a03-066" @default.
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