וַיֶּחֱמ֥וּ הַצֹּ֖אן אֶל־הַמַּקְל֑וֹת וַתֵּלַ֣דְןָ הַצֹּ֔אן עֲקֻדִּ֥ים נְקֻדִּ֖ים וּטְלֻאִֽים׃
Il bestiame entrava in calore guardando i bastoni, indi le femine partorivano segnati ai piedi, punteggiati e variegati.
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.