They said four suspected poachers were arrested last night for the killing of the endangered species, protected under the Wildlife Act, in a forest area of the district.
The animal's beheaded carcasses, a gun and a jeep were seized from the four - identified as Nitin Jauhri, Riyaj Hussain (both from Sehore), Sayeed of Bhopal and Nathan Singh Rajput, a resident of Vidisha, the officials said.
The four were caught by a patrolling team when they were taking away the carcasses of black bucks in a jeep after hunting them in the jungles of Nipaniya and Atraliya villages, about 20km from Sehore city, they added.