However , the differences between levels in treated and non-treated animals were deemed significant enough for the EU to ban imports of U.S. beef .
Thus , current scientific evidence is insufficient to support the hypothesis that pubescent maturation is caused by the hormonal substance use in animals .
The differences between levels in treated and non-treated animals were deemed significant enough for the EU to ban imports of U.S. beef .
Thus , current scientific evidence is insufficient to support the hypothesis that pubescent maturation is caused by the hormonal substance use in animals .