These two readings are forms IV and I of the same verb, with the same meaning. Allah speaks with the first-person majestic plural.

The form I verb is here ascribed to the cattle etc. which produce the milk by Allah's will.

Abū Jaʿfar al-Madanī

Ibn ʿĀmir al-Shāmī

وَإِنَّ لَكُمْ فِى ٱلْأَنْعَـٰمِ لَعِبْرَةً ۖ نُّسْقِيكُم مِّمَّا فِى بُطُونِهَا وَلَكُمْ فِيهَا مَنَـٰفِعُ كَثِيرَةٌ وَمِنْهَا تَأْكُلُونَ