Genesis 30:41

And it came to pass in the time wherein the cattle became pregnant, conceiving in the belly, Jacob put the rods before the cattle in the troughs, that they might conceive by the rods.

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.

Whenever the stronger of the flock conceived, Jacob laid the rods in front of the eyes of the flock in the watering troughs, that they might conceive among the rods;