The Sages of the Talmud forbade the drinking of milk which was milked by a non-Jew without a Jew’s supervision, as it may have been mixed with milk from a non-kasher animal. Nevertheless, the halakhic authorities in many Sefaradi communities have traditionally permitted the consumption of milk bought from non-Jews and that was milked without Jewish supervision. The reason is that it was uncommon, even for gentiles of the region, to keep non-kasher animals, and the milk of non-kasher animals (such as camels) was very expensive. Therefore, there was no concern that the milk of non-kasher animals would be mixed with that of kasher ones [1].


In the United States, where the government strictly regulates the production of foodstuffs and does not allow the mixing of milk from different animals, Ribi Moshé Feinstein zt”l also permitted the consumption of non-Jewish milk [2].


However, it must be mentioned that in Morocco there were those who were strict and refrained from consuming any non-Jewish dairy product [3].


[1] See Responsa of the Rashbash 554 and the Peri Hadash.