sn He put the branches in front of the flocks … when they came to drink. It was generally believed that placing such “visual aids” before the animals as they were mating, it was possible to influence the appearance of their offspring. E. A. Speiser notes that “Jacob finds a way to outwit his father-in-law, through prenatal conditioning of the flock by visual aids—in conformance with universal folk beliefs” (Genesis [AB], 238). Nevertheless, in spite of Jacob’s efforts at animal husbandry, he still attributes the resulting success to God (see 31:5).