Effect of parasympathetic stimulation on saliva production is
Regulation of saliva production :

Parasympathetic ⇒ High volume, watery enzyme rich secretion.
Sympathetic ⇒ small volume,.thick viscous mucus  secretion.
Causes high volume, thick viscous secretion
Causes small volume, watery secretion
Causes high volume, watery secretion
Causes small volume, thick viscous secretion