Genesis 30:37-39

New Century Version

³⁷ So Jacob cut green branches from poplar, almond, and plane trees and peeled off some of the bark so that the branches had white stripes on them. ³⁸ He put the branches in front of the flocks at the watering places. When the animals came to drink, they also mated there, ³⁹ so the flocks mated in front of the branches. Then the young that were born were streaked, speckled, or spotted.