Trani explain that it is the actual giving of the Challah portion to the Kohen that is the primary component of the Mitzvah. According to the Talmud, the requirement to separate Challah from the dough was imposed on the owner of the dough, not on the person who kneaded it; hence if the owner was not Jewish, even if the kneader was, Hafrashat Challah was not mandatory. The requirement does not apply to quantities of less than one omer, neither to bread prepared as animal feed. Although the Biblical expression when you eat of the bread of the land might be understood as applying only to bread eaten in the Land of Israel, Rabbinic sources interpret that Hafrashat Challah should be observed in the Diaspora as well. Minimal amount of source dough The minimal quantity of dough whose preparation mandates the performance of the Mitzvah is quantified by Chazal as a portion of flour equivalent to 43 and 1/5 eggs, also known as one omer (one-tenth of an ephah). According to Maimonides, it is possible to test the trigonometric calculations for the volume of 43.2 eggs. This said quantity of flour can be measured by filling-up a space 10 fingerbreadths x 10 fingerbreadths square (the finger's breadth being appx. 2.5 cm), with a depth of 3 fingerbreadths and 1/10 of another fingerbreadth, along with a little more than 1/100 of another fingerbreadth. In modern terms; The quantity that qualifies the reciting of a Brocha is about 1.64 kg. (Some do not recite a blessing unless the quantity is above 2.25 kg.) A quantity of flour weighing between approximately 2 lb 11oz (1.23 kg) and 3 lb 11oz (1.666 kg) qualifies for giving Challah but no Brocha is recited Amount of the actual gift The Torah does not specify how much dough is required to be given to the Kohen, this is discussed in the Talmud. The rabbinical stipulation is that 1/24 is to be given in the case of private individuals, and 1/48 in the case of a commercial bakery. If the baker forgets to set aside Challah, it is permissible to set aside Challah portion of the bread after it has been baked. Miscellaneous specifics The Mitzvah is listed as one in effect in Israel even during the Shmittah (Sabbatical) year. Even the pauper who is entitled to collect Peah and would be exempt from giving Ma'aser (Tithe) is