在美国，部分奶牛被注射一种名为重组牛生长激素(RBST)的激素，据称，这种激素可以使牛奶产量提高。
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2.3.3 基于退避式二进制搜索树(RBST)防冲突算法 37-40
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高温条件下应用重组牛生长激素(recombinantsomatotropin,rbST)可提高奶牛的泌乳性能[3],但奶牛长期使用rbST导致激素在乳产品的残留,影响人畜?
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rBST-free 生长激素
Growth hormones in milk (rBGH or rBST) are genetically modified and have been directly linked to cancer, especially in women.
生长激素在奶业中(rbgh或rbst)被用于基因改造，并能直接诱发癌症，尤其是妇女人群。
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The RBST said the breed had experienced a "resurgence in its fortunes" with almost 4, 000 UK ewes now registered.
BBC: Shropshire Sheep are officially 'no longer rare'
The Rare Breeds Survival Trust (RBST) has removed the sheep from its annual watch list of native breeds "of genetic conservation importance".
The annual watch list was revealed at a RBST event attended by The Prince of Wales, who said he may consider establishing a flock of Shropshire Sheep himself.
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