Ghoshayatra Parva is the thirty ninth upa parva included in the third maha parva, named as Vana parva or Aranyaka parva in the epic Mahabharata. The original epic was composed by Vyasa in Sanskrit. Vyshampayana had narrated to Janamejaya the historical events, happened in the forests on his queries.
This upa parva is also called as Gau Goshayatra since the inspection of the cow herds of the Kauravas had been carried out near the Dvaitavana in this parva.
How a Brahmin had described about Pandavas to Dritarashtra and how he felt it?
A Brahmin from the Dvaithavana had visited Hastinapura and met with Dritarashtra. He had reported about the Pandavas narrating the hardships and their sufferings in the forests. Then Dritarashtra had become sympathetic towards Pandavas and repented for the past events of dice games held in his palace. Dritarashtra felt afraid of Arjuna since he procured special weapons and anticipated destruction of Duryodhana and his other children if a war would start.
How Duryodhana had secured the permission of Dritarashtra to go near Dvaitavana?
Shakuni advised Duryodhana to carry out the inspection of their royal cow herds that grazed near the Dvaithavana. They accompanied veterinary doctors with them and with inspection of cow herds as their primary reason, asked the permission of Dritarashtra to go near Dvaithavana. Dritarashtra had consulted with Bhishma and Drona and advised Duryodhana not to go near the camp of Yudhishtira to avoid unprecedented incidences. Then Duryodhana with his wife Bhanumathi and Karna started with their ministers and required security troops.