Yoreh Deah Siman 19 Seif 8

 

ח הָיָה שׁוֹחֵט חַיָּה אוֹ עוֹף וְדַעְתּוֹ לִשְׁחֹט עוֹד, וְשָׁכַח וְכִסָה וּבֵרַךְ, כְּשֶׁחוֹזֵר לִשְׁחֹט אֵין צָרִיךְ לַחֲזֹר וּלְבָרֵךְ עַל הַשְּׁחִיטָה, שֶׁאֵין הַכִּסוּי הֶפְסֵק.

 

Seif 8

If one slaughtered a beast or fowl and he intends to slaughter another, and forgot that he was planning to slaughter more, so he covered the blood and said the blessing over the mitzvah of covering, when he slaughters again he doesn’t need to repeat the blessing on the slaughter, and covering the blood is not an interruption.