Nepalis are in general, Hindu and do not sacrifice bovine cattle. They DO sacrifice and eat water buffalo and other non-divine species. They use khukuris, ramdao and kora. I've not heard of a tarwar being so used, but it's possible I guess.
The tradition is that the person chosen to conduct the sacrifice must behead the buffalo in one blow to ensure good luck and bountiful crops for the following year. If he does not, there will be bad luck for the year and he will be shunned until at least the next sacrifice. the khukuris used are generally larger and heavier than those used by Gurkhas in combat. I am not familiar with the slaughtering of buffalo in non-religious contexts tho. It's a low caste occupation relegated to the 'untouchables' or service castes.
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