Reference for Chullin 157:1

ולחנניה כתיב אותו דמשמע זכר וכתיב בנו מי שבנו כרוך אחריו דמשמע נקבה הלכך נוהג בין בזכרים בין בנקבות

According to Hananiah, however, [the implication of the verse is this]: It says: 'it', which indicates the male parent, and it also says: 'its young', which relates to that parent to whom the young clings; hence it is clear that the law applies both to the male and female parent.

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