Assertion: goat's age | /r/HasProperty | determined
Facets:
value: by counting their growth rings
type: MANNER
Source sentences:
text: The age of mountain goats can be determined when they are about 22 months old by the number of rings on their horns.
text: They do not shed their horns, so a goat's age can be determined by counting the annual growth rings.
text: Pygmy goats do not shed their horns, so their age can be determined by counting their growth rings.