[Advaita-l] Query about a passage from taittirIya AranyakaM

[Venkata sriram P]

Namaste,
As shri Nori ji pointed out, the restrictions for nArAshamshi is on specific occasion only. 
It is a vidhi during brahmayajnA as it gives tripti to dEvatAs which is equivalent to "mAmsa-ahuti".  
gAtha is the "gAyati" mantra vishEsha (yO asya kauSTEya...)
regs,sriram