Matthew Poole and continuators on Genesis 30:39

39 And the flocks conceived before the rods, and brought forth cattle ring-straked, speckled, and spotted .

Heb. were heated, i. e, inflamed or excited and disposed to conceive, and this in a more than ordinary manner by the divine disposal.

This hath some foundation in nature because of the great power of imagination; and there are divers instances in many authors both of Women and of Beasts who either by the strong fancying, or by the actual and frequent contemplation of some certain objects have brought forth young ones exactly [illegible: 1+ letters]f the same colour and complexion, as one did an Ethiopian, &c. But the Providence of God was the principal cause of this effect, without which the productions of that kind would neither have been so many, nor so certain. This policy of Iacobs could scarcely be excused from deceit and injustice, if it were not manifest that it was done by the direction and authority of the sovereign Lord of all estates, Gen. 31. 9, 11, &c. who may take them from one and give them to another, as it pleaseth him, who also observed Labans injustice, and gave to Iacob no more than he abundantly deserved from Laban.