וַיֶּחֱמ֥וּ הַצֹּ֖אן אֶל־הַמַּקְל֑וֹת וַתֵּלַ֣דְןָ הַצֹּ֔אן עֲקֻדִּ֥ים נְקֻדִּ֖ים וּטְלֻאִֽים׃
Les brebis s’échauffèrent devant les rameaux et produisirent des agneaux rayés, pointillés, mouchetés.
Rashi on Genesis
אל המקלות means at the sight of the rods.
Rashbam on Genesis
ויחמו הצאן, this is a masculine construction.
Radak on Genesis
ויחמו, a reference to the males. However, as we learned earlier, the females would be in heat simultaneously.