Commentary for Chullin 57:9

אמר רבא

Thereupon Abaye said to him: But is there not here an a fortiori argument: If in the law concerning trefah, notwithstanding that [in certain cases] the slightest defect will render an animal trefah, nevertheless whenever we do require a greater portion we insist upon a greater portion that is perceptible to the eye, how much more in the law concerning shechitah, where no slaughtering is valid without the greater portion having been cut, should we insist upon a greater portion which is perceptible to the eye? - Rather say [thus]: All are of the opinion that an exact half is not equivalent to the greater portion, and when the dispute between Rab and R'Kahana was reported it was only in connection with the passover sacrifice.

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