Suwaid bin Ghaflah reported The collector of the Prophet ﷺ came to us. I caught hold of his hand and read in the document that the goods were not to be combined nor were they to be separated for fear of zakat. There is no mention of milch animals in this tradition. (Using translation from Abū Dāʾūd 1580)   

أَتَانَا مُصَدِّقُ النَّبِيِّ ﷺ فَأَخَذْتُ بِيَدِهِ فَقَرَأْتُ فِي عَهْدِهِ «أَنْ لَا يُجْمَعَ بَيْنَ مُتَفَرِّقٍ وَلَا يُفَرَّقَ بَيْنَ مُجْتَمِعٍ خَشْيَةَ الصَّدَقَةِ»