Thousands of years of selective breeding have produced extensive genetic changes in the plants and animals we eat, not all of them good.
数千年的选择性培育已经造成了食用植物和动物广泛的基因改变,并非所有的改变都是好的。
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They will now look into breeding new plants and feed with high sources of fat and sugar, as well as dietary additives such as garlic extract.
除研制大蒜提取物等饲料添加物外,现在他们正准备培育新品种植物以及高脂、高糖分饲料。
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The team made the discovery while hunting for genes that boost heterosis, the phenomenon by which cross-breeding two varieties ofplants produces more vigorous hybrid offspring with higher yields.