How to write to already opened FD in golang

I have the following opened FD (lsof output):

auth    11780 root    5w  FIFO               0,10      0t0  72061824 pipe

I need to write something in FD 5 (FIFO) in go. In C it is performed by the syscall write():

19270 write(5, "*************", 12 <unfinished ...>

Thank you in advance!