Genesis 30:39

39 and the flocks conceive at the rods, and the flock beareth ring-straked, speckled, and spotted ones.

Genesis 30:39 In-Context

37 And Jacob taketh to himself a rod of fresh poplar, and of the hazel and chesnut, and doth peel in them white peelings, making bare the white that [is] on the rods,
38 and setteth up the rods which he hath peeled in the gutters in the watering troughs (when the flock cometh in to drink), over-against the flock, that they may conceive in their coming in to drink;
39 and the flocks conceive at the rods, and the flock beareth ring-straked, speckled, and spotted ones.
40 And the lambs hath Jacob parted, and he putteth the face of the flock towards the ring-straked, also all the brown in the flock of Laban, and he setteth his own droves by themselves, and hath not set them near Laban's flock.
41 And it hath come to pass whenever the strong ones of the flock conceive, that Jacob set the rods before the eyes of the flock in the gutters, to cause them to conceive by the rods,
Young's Literal Translation is in the public domain.