Genesis 30:36

33 And my justice shall answer for me tomorrow before thee, when the time of the bargain shall come; and all that is not of divers colours, and spotted, and brown, as well among the sheep as among the goats, shall accuse me of theft.

34 And Laban said: I like well what thou demandest.

35 And he separated the same day the she-goats, and the sheep, and the he-goats, and the rams of divers colours, and spotted; and all the flock of one colour, that is, of white and black fleece, he delivered into the hands of his sons.

36 And he set the space of three days journey betwixt himself and his son-in-law, who fed the rest of his flock.

37 And Jacob took green rods of poplar, and of almond, and of plane-trees, and pilled them in part: so when the bark was taken off, in the parts that were pilled, there appeared whiteness: but the parts that were whole, remained green: and by this means the colour was divers.

38 And he put them in the troughs, where the water was poured out; that when the flocks should come to drink, they might have the rods before their eyes, and in the sight of them might conceive.

39 And it came to pass, that in the very heat of coition, the sheep beheld the rods, and brought forth spotted, and of divers colours, and speckled.