Genesis 30:38-40

Young's Literal Translation

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.