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首页> 外文会议>International Symposium on the Nutrition of Herbivores(ISNH-7); 20070917-22; Beijing(CN) >Growth rate responses to magnesium or sodium supplements in lambs grazing dual-purpose wheats
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Growth rate responses to magnesium or sodium supplements in lambs grazing dual-purpose wheats

机译：放牧两用小麦羔羊对镁或钠补充剂的生长速率响应

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摘要

Lambs grazed vegetative wheat crops in south-east Australia with and without Mg or Na supplements. Relative to the requirements for lamb growth, wheat forage was marginal for Mg, adequate for Ca, excessive for K and very low in Na. In Experiment 1, a combined Mg/Ca/Na supplement led to a 54% increase in lamb liveweight gain compared with unsupplemented lambs. Further experiments were then conducted to separate the responses to Mg or Na. In Experiment 2, Mg or Na supplements increased liveweight gain by 24 and 37%, respectively. In Experiment 3, Mg intake by lambs was increased by fertilizing the wheat crop with MgSO4. This increased wheat forage Mg from below (0.10% DM) to above (0.17% DM) that required by lambs and resulted in 24% faster liveweight gain at a stocking rate of 18/ha. At higher stocking rates (33, 47 sheep/ha), the response to Mg declined as herbage supply became increasingly limited. In the final experiment, Na-supplemented lambs grew 25% faster than unsupplemented lambs. The observed responses to Mg and Na may be separate responses, but diets low in Na and high in K have been shown to impair ruminal Mg absorption. The wheat forage in Experiments 1-4 contained 3-4% of DM as K and very low Na concentrations. We present evidence suggesting that the response to Na could partly be due to improved Mg absorption, arising from a reduction in dietary K:Na ratio.
机译：在有或没有镁或钠补充剂的情况下，小羊在澳大利亚东南部的无草小麦作物上吃草。相对于羔羊生长的需要，小麦饲草的镁含量很小，钙含量充足，钾含量过多，而钠含量很低。在实验1中，与未补充的羔羊相比，组合的Mg / Ca / Na补充剂可使羔羊的活体重增加54％。然后进行进一步的实验以分离对Mg或Na的响应。在实验2中，镁或钠补充剂分别使体重增加24％和37％。在实验3中，通过用MgSO 4对小麦作物施肥来增加羔羊的镁摄入量。这使羔羊所需的小麦饲草镁从低于（0.10％DM）增至高于（0.17％DM），并且在18 / ha的放养率下使牲畜体重增加了24％。在较高的放养率下（33、47只羊/公顷），随着牧草供应越来越有限，对镁的反应下降。在最后的实验中，补充Na的羔羊比不补充Na的羔羊快25％。观察到的对镁和钠的反应可能是单独的反应，但是低钠和高钾的饮食已显示会降低瘤胃中镁的吸收。实验1-4中的小麦草料含有3-4％的DM（以K计）和非常低的Na浓度。我们目前的证据表明，对Na的反应可能部分归因于饮食中K：Na比例降低引起的Mg吸收提高。

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