Matsya Purana — The Ravi-Śayana
रौप्यखुरीं हेमशृङ्गीं सवत्सां कांस्यदोहनाम् दद्यान्मन्त्रेण पूर्वाह्णे न चैनामभिलङ्घयेत् //
raupyakhurīṃ hemaśṛṅgīṃ savatsāṃ kāṃsyadohanām dadyānmantreṇa pūrvāhṇe na caināmabhilaṅghayet //
In the forenoon, with the proper mantra, one should gift a cow whose hooves are adorned as with silver and whose horns are adorned as with gold, together with her calf and a bronze milking vessel; and one should not transgress against her or violate the prescribed observance.
This verse does not discuss pralaya; it focuses on dharma in the form of ritual gifting (go-dāna) and the proper manner and timing of the donation.
It gives a clear householder/royal duty: perform charitable gifting with correct ritual form—offer a properly adorned cow with her calf and necessary implements, recite mantra, choose an auspicious time (forenoon), and avoid any act that violates the sanctity of the gift.
The significance is ritual rather than architectural: it specifies pūrvāhṇa timing, mantra-recitation, and complete gifting (cow + calf + bronze milking vessel), along with a rule of non-transgression/disrespect toward the donated cow.