Let him know that all beings are dependent on him (the sun). What he is before his rising, that is the hinkâra. On it animals are dependent. Therefore animals say hin (before sunrise), for they share the hinkâra of that Sâman (the sun).

In plain words: All living beings depend on the sun. The time before sunrise is the first part of the chant, and animals belong to it. That is why animals make the sound 'hin' before dawn.