Half Kosher

ובשר בשדה טריפה לא תאכלו

How is it possible to have half an animal kosher and the other half is Treifah?

The Pischei Teshuva (Y.D. 110 sk4) brings a story that actually happened.

A  butcher Schechted 7 cows. All seemed to be kosher. He sent 2 ½ cows to the shop (Yatkeh) and the rest he kept at home. After the 2 ½  cows were sent away (פרוש) he

discovered one stomach (unknown from which cow)

was pierced (Treifah)

There are two important rules in רוב .

כל קבוע כמחצה על מחצה

.At the place where Safek originated we don’t follow majority.

כל דפרוש מרובא פרוש

.If the object left original place, we do follow majority.

The two whole cows at the Yatkeh, (פרוש) we follow majority

(6 out 7 are kosher) and are kosher

The four whole cows at home, (קבוע) we don’t follow majority

and are Treifah.

The two Halves, we have a three-way Machloke, if both are

kosher or both are Treifah and the Pri Chadash who holds ,

the half at home (קבוע) is Treifah and

the half at the Yatkeh (פרוש) is kosher.