The cow-killing festival is the largest social event in the Mro tribal society. The festival is usually held in December, January, and February when their annual harvest ends.

Again, in the hope of curing the diseases of the house, in the hope of peace and high yield in the house, ‘Thurai’ or the purpose of the Creator is worshiped in this festival. Mrora still vows to kill cows if any member of the family suffers from an incurable disease.

Mrod believes that the soul of the cow is the enemy of their nation. When the soul of a cow falls on a family, the members of that family suffer from various diseases. Then they vowed to get rid of it.

The ceremony was completed by killing three cows. Mrora live by spring water. So they sacrifice animals to please and thank the fountain god. For this reason, when a family organizes a cow-killing ceremony, a cow has to be sacrificed for the god of the spring. The other two cows were killed in the middle of the neighborhood.

A week before the ceremony, everyone in the neighborhood made a bamboo mat and a two-storied machang. Below the machanga is a small enclosure. Cows are tied inside this enclosure. On the evening of the ceremony, invited guests, tribal people, close relatives and villagers present a bottle of wine (their favorite drink) as a gift to the event organizer. Gone are the days of drinking. In Mro language, this gathering is called 'Taoi'.

In preparation for the dance on the night of the festival, the young women adorn themselves with various kinds of silver ornaments and colorful flowers. They wear flowers of different colors on their heads and ears, beads around their necks, different types of belts, silver bangles on their hands and bells on their feet. At the end of the makeup, the young women gather under a tree to dance. The sound of their humming breaks the silence around them. The youths descended in a line from Machang with 10-12 hand long ‘Pung’ (flute made of bamboo).

At this time, a kind of wild gourd is pierced and 10-12 cubits long thin bamboo is inserted and wax is applied to make the flute melody. This shook all the hilly forests. Then the young men play the flute and the young women dance to the beat of the flute. The melody of a strange flute seemed to put the cow to sleep. To the tune of the flute and to the beat of the dance, he also began to cut his last jaw. A ritual that lasts all night.

In the morning, the householder blows a sharp spear in one hand and wine mixed with ginger-water into the mouth of the cow and utters a mantra. As soon as he finished reciting the mantra, he stabbed the spear along the heart on the right side of the cow. When the cow fights to the death with the spear, the speed of Mrod's dance and song increases. When the cow is scurrying to its death, the householder cuts out his tongue with a spear and puts it on the ‘linga’ (cow-tying pole). Because they believe that at one time the cows ate the religious texts containing the alphabet of Mrod. That is why the tongue of the cow has been stuck on the head of the pole today. Afterwards, everyone cooked various dishes with beef.

There is a folk tale behind Mrod's cow-killing ceremony. What's that story?

The Mro people believe that there is a superpower behind the creation of the moon, sun, planets and stars, the fauna and flora of the earth. He is the Creator or Thurai.

One day, the Creator decided to give a religious book containing the alphabet for the purpose of guiding the creatures, including mankind, to the right path. He summoned the leaders of all the nations of the world to be present one day to receive that book or religious text. Then the crops of Zum were growing. Therefore, the leader of the Mro nation could not attend the event in time due to his busy schedule. The Mro chief is present when the leaders of other nations return with the library. By then the creator or Thurai has returned to heaven.

The next morning the creator or Thurai took the initiative to send their books to Mrod through the cows. The texts mentioned about monthly farming, religious principles, socio-cultural issues. All religious restrictions and advice were also written on the banana page.

At the direction of Thurai, the cows set out with the library. The time was summer. The cow gets tired of walking in the hot sun. On the way there was a huge banyan tree. In his shadow the cow rested her head on the book and fell asleep unknowingly. By the time I woke up, the afternoon was getting darker. His stomach began to churn with hunger. Seeing no way out, he ate the banana leaf library.

In addition to the alphabet and religious subjects, the book also had instructions that paddy should be harvested three times a year, cotton three times, sesame three times a year, and weeding only once. When the bookless cow approached Mrod, he forgot all about it.

Seeing no way out, the cow went to Mrod and said, ‘Thurai is very angry with you for not being able to attend the book-giving ceremony at the right time yesterday. So he sent me to tell you what to do in the future because you will not be given the book. ' Asked about the instructions, the cow said, "Once the crop can be lifted from the zoom and weeded many times, including the maintenance of the zoom crop."

When the cow returned, the cow began to answer erratically when asked if the book had been delivered to Thurai Mrod properly. Thurai or the creator can understand the matter only then. Mrora, meanwhile, saw that their guidance did not match that of other nations. So one day they went to Thurai or the Creator to find out the reason.

On hearing all this, Thurai expelled the cow from heaven for the crime of lying. Besides, he said, "Unless the Mro people get religious texts containing the alphabet, the Mro will torture you (cattle)." Your punishment will be in the middle of the village of Mrod in Limpu (in the middle of the neighborhood). They will dance around you all night in cages. And in the morning he will kill with a spear. And your false tongues will be cut off and tied to the poles. That is the proper punishment for lying. '

The Mro tribes believe that their ancestors have been organizing cow-killing ceremonies since the incident. But now those of the Mrod who have adopted the ‘Krama’ religion refrain from cow-killing. Because the followers of 'Krama' religion now have the alphabet and religious texts. As a result, they think, the cow is now free from the curse of the Creator.