Hi Pavithra.

As per the official notification dated February 22, 2018 released by The Veterinary Council of India, candidates seeking admission in B.V.Sc & AH courses through 15% All India Quota seats will have to compulsorily appear for NEET 2019.
Admissions to these 15% seats in UG course in Veterinary Science & Animal Husbandry for 2019-20 session at recognized veterinary colleges will be on the basis of NEET 2019 merit list issued by NTA. These 15% seats will be filled through counseling conducted by Veterinary Council of India (VCI).

Since this has been added to neet only this year , it is difficult to find the exact cutoff score. But a score of above 520 would be a safe bet.

Hope this helps.

Good luck!