Check with a Vet..Reason,when I was in Cancer treatment the DR.use to look at my finger nails,,so one day I asked ,Why,,The Dr. said anytime the human body experiences a sever sickness/chemo treatment,it affects the nail beds in the fingers,caused deep ridges in mine.SO a DR can look at your finger nails and tell if you have been very sick and approximately how long ago....
As horns are made of basically the same substance,,could be the cow was sick or something along those lines and it caused the horn to grow like yours....
Interesting either way....