In Nepal's Preliminary Draft Constitution 2015 it is stated that Cow will be the national animal of Nepal like it was stated in our old Constitution.
BUT how It can be possible that COW to be an national animal in the country where historically Tamang, Sherpa, Limbu, Sarki etc eat cow meat "beef" as per their tradition and culture that was banned by Rana Regime because Rana rulers considered cow as their MOTHER as per their belief system but for Tamang, Sherpa, Limbu, Sarki cow is an animal like others such as goat, buffalo, pig, etc.
For an animal that is eaten worldwide by more than 85% people to be considered national animal is BLIND in MIND thoughts and ideas. If our law makers are wise they would propose One Horn Rhino as a national animal which is an endanger animal in the process of extinction.
Abuse Of Religious Freedom: Loss Of Identity: Dr. Govinda Bahadur Tumbahang 
The statement of great King Prithivi Narayan Shah that Nepal was a Hindustan (the place of the Hindus) in the real sense is criticised especially by the Janajatis whose traditional religion is Kirant, which has distinctive characteristics. The rulers after him prohibited cow slaughter as the Hindus consider her as a "mother" and worship her on her day.
Janajatis like the Limbus, on the other hand, have a tradition of offering a cow's head to a goddess in order to please her. Therefore, the ban on cow slaughter would prevent them from performing their religious rituals. They were bound to lie to the goddess by promising her a cow's head and offering her instead a goat's head. Even now the tradition of lying to the goddess has not stopped. All Janajatis were compelled to observe the Hindu festival Dashain. Two Athpahariyas, namely Lalima and Ritima, who did not obey the order to observe it were hanged to death.
Junga Bahadur Rana, the then prime minister, introduced a Civil Code to strengthen and consolidate Hinduism. The Constitution of the Kingdom of Nepal 2019 and the Constitution of the Kingdom of Nepal 2047 continued this trend. In the beginning several schools and finally Nepal Sanskrit University were established to spread Hinduism at the expense of public taxes. As the state encouraged Hindu religion and discouraged others, they have been marginalised. These are the grievances that the Jananatis have against the state.
1. Abuse Of Religious Freedom: Loss Of Identity: Dr. Govinda Bahadur Tumbahang http://trn.gorkhapatraonline.com/index.php/op-ed/3132-abuse-of-religious-freedom-loss-of-identity-dr-govinda-bahadur-tumbahang.html