科研之友
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摘要
Background Magnesium (Mg) is an essential nutrient in animals and thus an adequate supply of dietary magnesium is important to safeguard animal health. It is generally accepted that the efficiency of Mg absorption is the critical determinant in Mg supply of ruminants. Insufficient absorption of Mg in ruminants leads to Mg deficiency which manifests in clinical signs such as tetany (grass tetany) or paresis (milkfever). Scope This overview aims to provide insight in the most relevant dietary factors that influence Mg absorption in ruminants and the state of the art knowledge on the mechanism of Mg absorption. Conclusions In practice, the use of manure to fertilize the soil is associated with an increased risk on grass tetany because it increases the K content of grass. A high K intake is the most important dietary factor that inhibits Mg absorption which entails the risk on Mg deficiency. The inhibitory effect of K on the effciency of Mg absorption can be counteracted by supplemental Mg. Magnesium oxide is commonly used to prevent Mg defiency but solubility of MgO varies greatly in practice. Thus, it is recommended to use only tested MgO sources. In the light of prevention of milkfever, supplementation in the form of Mg-chloride might be of interest as well. Due to its chloride ion, Mg chloride has a beneficial effect on the dietary cation-anion difference (DCAD).
- 出版日期2013-7
