This was very interesting. I was looking to see discussion of regrowth possibilities as most of the study seems to be on 3 months or younger. I wonder if as they age, if they have any regrowth or scurring. I see this, but it only says they recorded horn growth for two months and then compared it to horn growth data---I keep rereading the last part though and I am not sure I follow.
"The speed of horn growth was evaluated by measuring of horn height (distance from base to tip of horn) with a fine caliper. The data of horn height was recorded during two months study and compared statistically, after that; the horn growth was evaluated clinically between the groups for a 12-month study period."
I think this graph they provided may address that. It clearly shows the clove horn has zero growth over the 2 month period, while the saline slowed growth for a couple of days and then no longer had any effect with similar growth rates between the saline and the non injected horn growth.