Genesis 30:39

And the flocks conceived before the rods, and brought forth cattle ringstraked, speckled, and spotted.

Cross-reference

In Genesis 31:9-12, God claims credit: He took Laban's flocks and gave them to Jacob — revealing the spotted offspring as divine, not strategic.

In 31:10, Jacob recounts a dream where God showed him the same striped and speckled goats mating — revealing the divine intervention behind the flocks' multiplication.

In Genesis 31:42, Jacob credits God with seeing his affliction — the spotted flocks being God's recompense for Laban's exploitation.