Genesis 30:38 in the King James Version
And he set the rods which he had pilled before the flocks in the gutters in the watering troughs when the flocks came to drink, that they should conceive when they came to drink.
Context
37 Jacob took to himself rods of fresh poplar, almond, and plane tree, peeled white streaks in them, and made the white appear which was in the rods.
38 He set the rods which he had peeled opposite the flocks in the watering troughs where the flocks came to drink. They conceived when they came to drink.
39 The flocks conceived before the rods, and the flocks produced streaked, speckled, and spotted.