Yoreh Deah Siman 24 Seif 2

 

ב שָׁחַט בְּהוֹלָכָה אוֹ בַּהֲבָאָה לְבַד, אִם יֵשׁ בַּסַכִּין כִּמְלֹא צַוָּאר וְחוּץ לַצַּוָּאר כִּמְלֹא צַוָּאר כְּשֵׁרָה; וְאִם לָאו, פְּסוּלָה, שֶׁכָּל שֶׁאֵין בּוֹ כַּשִּׁעוּר הַזֶּה אִי אֶפְשָׁר לִשְׁחֹט בְּלֹא דְּרָסָה, עַל יְדֵי הוֹלָכָה אוֹ הֲבָאָה לְבַד; וְאִם הוֹלִיךְ וְהֵבִיא, אֲפִלּוּ שָׁחַט בְּאִזְמֵל כָּל שֶׁהוּא כְּשֵׁרָה.

 

Seif 2

When one slaughters by only bringing the knife forward and backwards (on the neck)  if it is with a knife that is the fullness of the neck and extends off the neck, the fullness of the neck, it is acceptable  if not it is not acceptable.

Any [knife] that is not this measurement; it is impossible to slaughter without “dirasah” by going in a forward and backward motion alone. But if he goes forward and backward with a very sharp knife it is kosher. There are those that are stringent with cattle. The custom being that these circular motions are not acceptable in cattle even if forward and backward if it is not with a knife that extends the fullness of the neck and outside the neck.