Lamand M
INRA, Laboratoire des Maladies Nutritionnelles, Ceyrat, France.
Ann Rech Vet. 1989;20(1):103-6.
French forages usually have low levels of molybdenum, and sulfur contents are often in excess in ruminant feeds. The minimum level of molybdenum able to trigger the copper sulfur molybdenum interference in sheep was measured with either elemental sulfur or sulfate (diets enriched to 5.2 g S/kg DM). Four groups of 5 lambs weighing 35 kg received elemental sulfur and 4 increasing doses of molybdenum in the first experiment. In a second experiment, 6 groups of 5 lambs received sulfate (one group was a control group; the second received sulfate only) and 4 increasing molybdenum doses. The sulfur-molybdenum-copper interference was quantified by the plasma copper fraction insoluble in 5% trichloracetic acid (TCA insoluble copper). Whatever the form of sulfur, the interference appears with a molybdenum level of over 2.4 mg Mo/kg DM. Sulfate interferes less than elemental sulfur with the molybdenum on copper metabolism.
法国的草料通常钼含量较低，而反刍动物饲料中的硫含量往往过高。使用元素硫或硫酸盐（日粮中硫含量提高到5.2克/千克干物质）测定了能够引发绵羊体内铜硫钼相互干扰的最低钼含量。在第一个实验中，四组每组5只体重35千克的羔羊摄入元素硫和4种递增剂量的钼。在第二个实验中，6组每组5只羔羊摄入硫酸盐（一组为对照组；第二组只摄入硫酸盐）和4种递增剂量的钼。通过血浆中不溶于5%三氯乙酸的铜组分（TCA不溶性铜）对硫-钼-铜相互干扰进行量化。无论硫的形式如何，当钼含量超过2.4毫克钼/千克干物质时就会出现相互干扰。硫酸盐对钼在铜代谢方面的干扰比元素硫小。
