This translation may not appear in the Seventy, but rather than terms like 'lagging behind' and 'keeping up,' they have offered an interpretation that is difficult to grasp. Scripture reveals that Jacob, a man skilled in strategy and resourcefulness, manages to remain fair and just through a clever contrivance. If all the livestock had produced colorful lambs and kids, it would have raised suspicions, prompting the jealous Laban to object publicly. Therefore, Jacob orchestrated his approach so that he would reap the rewards of his efforts while not leaving Laban completely deprived. At the time of mating, he placed branches before the flocks to encourage them to bear spotted young, since spring yields better results.
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When the sheep and goats sought mates later on, he refrained from presenting branches, ensuring that monochromatic livestock would be produced. Thus, all the offspring born first were attributed to Jacob, as they were of mixed colors, while those that came afterward belonged to Laban, comprising solely black and white animals. The passage that states 'that they should conceive before the branches' corresponds to the Hebrew term jeamena (לְיַחְמֵ֖נָּה). I can only describe the essence of the Hebrew word, as jeamena refers to an intense state of physical arousal during mating, where the entire body is in motion, and the act of desire is reaching its climax.