Apex domains cannot have CNAME records.
Question and response
Question
dig ns1.agr.co.za. NS
Answer
ns1.agr.co.za. 4 NS ns2.afternic.com.
ns1.agr.co.za. 4 NS ns1.afternic.com.
Authority
The response has no authority records.
Additional
ns1.afternic.com. 4 A 97.74.98.69
ns2.afternic.com. 4 A 173.201.66.69
ns1.afternic.com. 4 AAAA 2603:5:2126:0:0:0:0:45
ns2.afternic.com. 4 AAAA 2603:5:2226:0:0:0:0:45
. 0 OPT ; payload 1232, xrcode 0, version 0, flags 0