I've seen this a couple or three times and had one in particular recently. I had decided that this year I was going to mount a brant if the opportunity presented itself. Late in the season I got one, but it had a whole patch of feathers on the breast that were missing. On close inspection, it looked as if the bird had roosted on the ice and froze there. When the bird tried to move, it apparently broke or pulled out a patch of breast feathers. I wanted to mount the bird with its belly facing out and wings spread, so that brant wasn't suitable. On the second to last day of the season, I shot another, this one much bigger than the first. When I initially looked it over, it looked fine. When I started to skin the bird, I noticed the same thing on the breast, just not nearly as bad. I went ahead and mounted the bird and tried as best I could to hide the damaged plumage. Still, there's a noticeable line in the breast where the feathers were missing.
My question is this, was there any way to repair the damage during the mounting process? I had thought about trimming some skin off each side to bring the edges together, but decided against it. I tried grooming the feathers together, and that helped some, but the seam is still slightly noticeable. Any suggestions?