010-15 Wyo. Code R. § 15-11
(a) An "outline slightly defined" (AA quality) yolk is indistinctly indicated and appears to blend into the surrounding white as the egg is twirled.
(b) An "outline fairly well defined" (A quality) yolk is discernable but not clearly outlined as the egg is twirled.
(c) An "outline plainly visible" (B quality) yolk is clearly visible as a dark shadow when the egg is twirled.
(d) An "enlarged and flattened" (B quality) yolk is one in which the membranes and tissues have weakened and moisture has been absorbed from the white to such an extent that it appears definitely enlarged and flat.
(e) A "practically free from defects" (AA or A quality) yolk shows no germ development, but may show other very slight defects on its surface.
(f) A "clearly visible germ development" (B quality) yolk is one in which the development of the germ spot of a fertile egg has progressed to a point where it is plainly visible as a definite circular area or spot with no blood in evidence.
(g) "Blood due to germ development" is blood caused by development of the germ in a fertile egg to the point where it is visible as definite lines or as a blood ring. An egg having blood due to germ development is classified as inedible.
010-15 Wyo. Code R. § 15-11