(Mishnah): Pigul and Nosar are Metamei hands.

(Rav Huna or Rav Chisda): This is [a decree] on account of Kohanim who are suspected [of intentionally being Mefagel Korbanos];

(The other of Rav Huna and Rav Chisda): This is on account of lazy Kohanim (they are not zealous to eat their portion in time).

The first opinion explains the decree about Pigul; the latter opinion explains the decree about Nosar.

(Rav Huna or Rav Chisda): A k'Zayis is Metamei.

(The other of Rav Huna and Rav Chisda): A k'Beitzah is Metamei.

The first opinion says that the Shi'ur of [liability for the] Isur is the Shi'ur for Tum'ah; the second opinion adopts the usual Shi'ur for Tum'ah of food.

(Mishnah - R. Yishmael): If one blessed for the Mitzvah of eating Pesach, he need not bless for the Zevach (Chagigah of the 14th); if he blessed for the Zevach, he must also bless for Pesach.

R. Akiva says, neither of them exempts the other.

(Gemara): (The Torah requires Shefichah [pouring on the Mizbe'ach] for blood of Pesach, and Zerikah (throwing) for Shelamim.) R. Yishmael holds that Shefichah is considered [a form of] Zerikah (therefore, if one poured Dam of the Zevach like a Pesach, he was Yotzei - hence, a Berachah on Pesach exempts Chagigah);

However, Zerikah is not a form of Shefichah (if one threw Dam Pesach like a Shelamim, he was not Yotzei, so a Berachah on Chagigah does not exempt Pesach. Igros Moshe (Choshen Mishpat 1:108 u'Fele) sharply questions Rashi, who says here that we discuss the leftover blood; elsewhere, e.g. 89A, Rashi himself holds that we discuss the primary Matanos.)

R. Akiva holds that neither is a form of the other.

R. Simlai went to a Pidyon ha'Ben (redemption of a firstborn son).

Question: Obviously, the father blesses Asher Kidshanu b'Mitzvosav v'Tzivanu Al Pidyon ha'Ben (it is his Mitzvah);

Does the Kohen [who receives the money] bless Shehecheyanu, or the father?

Perhaps the Kohen blesses, for he benefits;

Or, perhaps the father blesses, for he does a Mitzvah! (Rashash - the Berachah is fitting for both of them - we ask which should bless to exempt the other, this is similar to our Mishnah.)

R. Simlai did not know.

Answer (Rabanan of Beis Medrash): The father blesses both.

The Halachah is, the father blesses both.