一些关于后者的最深刻的挑战已经在欧洲，其中一个最大的抗生素生长促进剂对欧盟禁令的国家。
Some of the most profound challenges regarding the latter have come in the countries of Europe, with one of the biggest being the European Union ban on antibiotic growth promoters.
他说：它可以链接到出生，下跌仔猪大小，但也受到了撤出的抗生素生长促进剂和仔猪的饮食习惯的改变。
He said it can be linked to decreased piglet sizes at birth, but also has been influenced by the withdrawal of antibiotics as growth promoters and changes in the piglets' diet.
他说：它可以链接到出生，下跌仔猪大小，但也受到了撤出的抗生素生长促进剂和仔猪的饮食习惯的改变。
He said it can be linked to decreased piglet sizes at birth, but also has been influenced by the withdrawal of antibiotics as growth promoters and changes in the piglets' diet.
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