Another factor is the squeeze that conventional dairy farmers have felt as the price of grain they feed their cows has gone up, tightening their profit margins.
另一个因素是，传统的奶农在他们喂养奶牛的谷物价格上涨时感到了压力，他们的利润空间也被压缩。
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Now, as world grain prices hover near record highs, a new study finds that the effects are already starting to be felt.