Thematic Bible: Facts about breeding

So that day he took all the he-goats which were banded or coloured, and all the she-goats which were marked or coloured or had white marks, and all the black sheep, and gave them into the care of his sons; And sent them three days' journey away: and Jacob took care of the rest of Laban's flock. Then Jacob took young branches of trees, cutting off the skin so that the white wood was seen in bands. read more.
And he put the banded sticks in the drinking-places where the flock came to get water; and they became with young when they came to the water. And because of this, the flock gave birth to young which were marked with bands of colour. These lambs Jacob kept separate; and he put his flock in a place by themselves and not with Laban's flock. And whenever the stronger ones of the flock became with young, Jacob put the sticks in front of them in the drinking-places, so that they might become with young when they saw the sticks. But when the flocks were feeble, he did not put the sticks before them; so that the feebler flocks were Laban's and the stronger were Jacob's. So Jacob's wealth was greatly increased; he had great flocks and women-servants and men-servants and camels and asses.

If he said, All those in the flock which have marks are to be yours, then all the flock gave birth to marked young; and if he said, All the banded ones are to be yours, then all the flock had banded young. So God has taken away your father's cattle and has given them to me.