Genesis 30:35; Genesis 30:41-42

35 But that day Laban removed the male goats that were striped and spotted, and all the female goats that were speckled and spotted, every one that had white on it, and every lamb that was black, and put them in the charge of his sons.

41 Whenever the stronger of the flock were breeding, Jacob would lay the sticks in the troughs before the eyes of the flock, that they might breed among the sticks,

42 but for the feebler of the flock he would not lay them there. So the feebler would be Laban's, and the stronger Jacob's.