A comprehensive review of the Sugya of ביטול thus far, with in depth explanations of the major points of the Sugya. Continuing on with a discussion of bitul according to Rebbe Yehudah involving meat that was properly shechted שחוטה and meat that was not נבילה.
Rav Chisda is explaining the position of Rebbe Yehudah who holds that מין בשאינו מינו is batel, whereas מין במינו is not. The reason for the position of רבי יהודה is that when something is mixed within another מין the small amount of the foreign substance is not readily discernible and is therefore בטל to the greater amount of the other מין that is present. However, in a case of מין במינו, since it is all the same material, when you look at it you even see the smaller foreign substance, as it is all the same material, and there is therefore no place for ביטול.
רב חסדא is explaining that according to רבי יהודה the determination of whether something is mixed with its own מין or not, can depend on the Halachic relationship between the two items.
Therefore, in a case where נבלה has fallen into שחוטה we say that the שחוטה can never take on itself the טומאה which is present on the נבילה, therefore they remain two distinct מינים and the נבילה is בטל to the שחוטה. By contrast, where the שחוטה has fallen into נבלה it is possible for the נבלה to taken on the no טומאה characteristic of the שחוטה and we therefore view the שחוטה as having fallen into its own מין and it cannot be בטל according to רבי יהודה.
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