Magnesium butyrate is a readily available magnesium source in dairy cow nutrition
Animal Feed Science and Technology(2023)
摘要
The aim of the present study was to measure the apparent absorption of magnesium (Mg) originating from Mg-butyrate. Six mid-lactation Holstein Friesian dairy cows were used with dietary treatments arranged in a cross-over design. Two different diets were fed during the experiment, consisting of a low Mg diet without Mg-butyrate (L-Mg, 3.1 g Mg/kg dry matter) or a high Mg diet with Mg-butyrate (H-Mg, 3.9 g Mg/kg dry matter). Cows offered the L-Mg diet ingested 54.7 g Mg/day while the cows fed the H-Mg diets ingested 66.3 g Mg/day (P < 0.001). The fecal excretion of Mg, however, was similar between the two experimental diets (P = 0.174). Consequently, apparent Mg absorption was found to be 7.9 % units greater (P = 0.038) when the cows were fed the diet supplemented with Mg-butyrate. The greater Mg absorption after feeding the H Mg diet was, however, not reflected by a greater urinary Mg concentration (P = 0.228). The fractional Mg absorption from Mg-butyrate was calculated to be 71.6 %, which indicates that Mg from Mg-butyrate is readily available for absorption. In conclusion, Mg-butyrate is an attractive alternative to supplement dairy rations with Mg.
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关键词
Magnesium,Absorption,Rumen,Butyrate
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