He set the sticks that he had peeled in front of the flocks in the troughs, that is, the watering places, where the flocks came to drink. And since they bred when they came to drink,
Here is Jacob's honest policy to make his bargain more advantageous to himself than it was likely to be. If he had not taken some course to help himself, it would have been a bad bargain indeed, which he knew Laban would never consider, or rather would be well pleased to see him a loser by, so little did Laban consult any one's interest but his own.
Commenting on Genesis 30:37-43
And when the cattle were feeble, he put them not in,.... Or "when covered", as Menachem, that is, with wool, and so not so desirous of copulation with the males, nor so fit and strong for generation; and therefore he put not in the rods into the gutters, partly that he might have none feeble in his flock, and partly that he might not spoil...
JACOB'S COVENANT WITH LABAN. (Gen. 30:25-43) when Rachel had born Joseph--Shortly after the birth of this son, Jacob's term of servitude expired, and feeling anxious to establish an independence for his family, he probably, from knowing that Esau was out of the way, announced his intention of returning to Canaan (Heb 13:14).
Commenting on Genesis 30:25-43