Gênesis 30:41

E todas as vezes que as ovelhas mais vigorosas concebiam, Jacó colocava as varas à vista do rebanho nos canais de água, para que concebesse diante das varas.

And it came to pass, whensoever the stronger cattle did conceive, that Jacob laid the rods before the eyes of the cattle in the gutters, that they might conceive among the rods.