The above image graphically shows a fleece which has a high vegetable matter (vm) content evenly spread across all points of the sheep.
This image highlights a different situation where the vm is confined to the edges of the fleece.
Fleece wool - wool from the body of a sheep. Fleece wool should be approximately 80% of the total wool shorn from one sheep
Skirtings - taken from the edges of a fleece. Designed to remove the main areas where vegetable matter will accumulate.
Bellies - shorn from the belly area. Usuall matted and with a higher content of vegetable matter, dust, and urine stain in the case of wether sheep.
Crutchings - shorn from the chutch area. High risk of urine stain (ewes) and faeces stain (dags).
Top knots or wigs - shorn from the head. Usually higher vm content. (If wool is not shorn from the head, sheep can become 'wool blind')
Locks - very short wool