Keeps existing noun part of speech; "baaing" functions as a noun meaning the sound or the act of making that sound.
The baaing of the sheep was heard across the field.
Блеяние овец было слышно через все поле.
baaingгерундий или причастие настоящего времени Added because "baaing" is commonly used attributively to modify a noun (e.g., "the baaing sheep").