Genesis 30:41

Whenever the stronger females were in heat, Jacob would place the branches in the troughs in front of the animals so they would mate near the branches,

(New International Version)

Moreover, whenever the stronger of the flock were mating, Jacob would place the rods in the sight of the flock in the gutters, so that they might mate by the rods;

(New American Standard Bible)

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.

(King James Version)