During the era of Varaha Avatar, after restoring the Earth from the deep ocean waters and killing Hiranyaksha, Sree MahaVishnu in the form of ADI YAGNA VARAHA, was drenched in muck.
It was mid noon, and he plucked a few of his hairs, that became DARBHA, and from his skin pores, evolved Black sesame seeds or TILA. Having put the DARBHA on the ground, and from the mud of his body, he made 3 balls, placed them on the DARBHA, and with the TILA he first did PINDA PRADHANA to the Pitru devatas.
When the Devatas asked about the same, he said
I am the Pitrudevatas, and I am also the father, grandfather and great grandfather of the entire Cosmos , and from now on all should do PITRU KARMA without fail.
This is the ritual of Pitrukarma that was taught to the universe by Sree MahaVishnu himself.
Pitrudevatas are the progeny of the Devatas and are responsible for the travel of Jeevatma to different realms according to their karma .
Everyone, including Devatas, should do Pitrukarma with same austerity and shraddha as they do Devakarma or Yagna.
When the Jeevatma attains a body, it is put to many troubles and turbulences according to its Sanchita karma. Pitrudevatas, who are spread in the entire Cosmos in different categories are the protection for the Jeevatma in this janma, and other realms after leaving the body.
There are 31 PITRU GANAS according to NARAYANEEYAM, who are divided into 7 categories according to the benefit they bestow.
PITRU DEVATAS are of two types:
MOORTHA (Those who have a distinct form) PITRU DEVATAS
AMOORTHA (who are formless) PITRU DEVATAS
All the 31 PITRU GANAS are from these 7 categories, and they are an invisible sheath of protection to our lives. Pitrukarmas energise these devatas, which in turn become an invincible protection from negative and evil forces that create unnecessary material and otherwise obstacles which in the form of failure, pain, suffering, unhappiness and loss of progeny, try and obstruct the elevation of the Aatma.
The Drik Pitrudevatas which protect us from four directions are
AGNISHWARTA in the East
BARHISHADA in the South
AADHYAPA in the West
SOMUKHA in the North
Apart from these there are 31 PITRU GANAS, which bestow us and protect in the material realm.
First category consists of 9 GANAS:
VISHWA, VISHWABHUK AARADHYA, DHARMA, DHAANYA, SHUBHAANANA, BHUTIDA, BHUTIKRUT, BHUTI SWARUPA.
As their names suggest these 9 GANAS help us in determining or etching our direction in this janma.
The second category consists of 6 GANAS
KALYADA, KALYAKARTA, KALYATARASRYA, KALYANA, KALYATHAHETHU, ANAGHA
These 6 GANAS help in fructifying the direction that we etch for ourselves in lives
The third category consists of 7 GANAS
VARA, VARENYA, VARADA, THUSHTIDA, PUSHTIDA, VISHWAPATHA, DATHA
These 7 GANAS make our efforts successful
The fourth category consists of 5 GANAS
MAHAAN, MAHATMA, MAHITHA, MAGIMANAYA, MAHABALA
These 5 GANAS help our success noticeable and increase our fame.
The fifth category consists of 4 GANAS
SUKHADA, DHANADA, DHRAMADA BHOOTADA
These 4 GANAS help consolidate happiness in the form of progeny.
Such astute science is embedded in the PITRU DEVATA VIGNANA.
To lead a life of fulfillment and Happiness in all avenues, PITRU DEVATA KRUPA is extremely essential.
According to NARAYANEEYAM, every person who obtained a physical form of human has to perform 96 Shraddha Karmas annually. As this is not possible for various reasons in Kaliyuga, one should at least perform Pitru Karmas for the following occasions in a year:
Every Mahalaya Paksha,
Annual Shraaddha Tithi of Departed Ancestors.
The Pinda Pradhana is usually done through water, Yagna, or through crows, but doing so will satiate those Pitrus who are in that particular realm.
Swayam SREE MAHAVISHNU says that when a Gowmata is fed, all the Pitrus spread in different realms in the cosmos would be satisfied and they would bless and protect us in all avenues.
At Kamadhenu Gowshala, we perform Amavasya Tarpana amidst the Gowmatas, on your ancestors Nama Gotra and Gowmata would be fed so that Pitru Doshas are satiated.