Genesis 30:41

Whenever the stronger females of the flock were in heat, Jacob would place the branches in the troughs, in full view of the animals, so that they would breed in front of the branches.
BSB · Berean Standard Bible
And it came to pass, whensoever the stronger cattle did conceive, that Jacob laid the rods before the eyes of the cattle in the gutters, that they might conceive among the rods.
KJV · King James Version
Whenever the stronger of the flock conceived, Jacob laid the rods in front of the eyes of the flock in the watering troughs, that they might conceive among the rods;
WEB · World English Bible
And it came to pass, whensoever the stronger of the flock did conceive, that Jacob laid the rods before the eyes of the flock in the gutters, that they might conceive among the rods;
ASV · American Standard Version

Related passages

From the Treasury of Scripture Knowledge, grouped by the word they explain.

whensoever the stronger cattle did conceive
As the means which Jacob used would not in general produce similar effects, nay, probably the experiment was never in any other instance tried with effect, it is more in harmony with Divine truth to suppose that he was directed by some Divine intimation; and rendered successful, if not by a direct miracle, yet at least by the Lord's giving a new and uncommon bias to the tendency of natural causes.
Genesis 30:41