Do you cut off all the fat and silver skin before you grind the deer meat? I want to use all the skirt meat and the rib meat but its all covered with fat and silver skin and would not be worth the time it would take to trim it all off.
How much silver skin you remove will be related to personal preference, how sharp your knives and grinder plates are, how cold the meat is, fineness of grind, what size the chunks are you put into the grinder and how well your grinder works.
In short, there is no firm rule. I usually remove the thicker stuff and don't worry about the more transparent thinner stuff but we use a commercial grinder with sharp plates and knives, cold meat and chunks about 1 to 1-1/4"cube sized. That works for us and results in cleanly cut and tender ground meat but your mileage may differ.
While opinions over what fat to remove are all over the place Utah State University research shows that not all fat is likely to taste gamey and that some is very beneficial to tenderness in the finished product, especially in roasts.
Cod fat is found on the brisket. Tallow fat is on the back, rump and somewhat less on the outer surface of the neck and the rear of the front shoulders. Marbling fat is the fat in between muscles, attached to the skirt meat and includes stuff clinging to and between the ribs once any tallow fat is peeled off. You will clearly see any tallow fat as a separate layer lying over the upper ribs and upper skirt meat.
The gaminess, if any, is generally limited to the tallow and cod fat with the most likely exception being deer 3-1/2 years old or older. Also, diet can affect taste in any animal and deep woods deer are going to taste different from farm country deer so you may want to take that into account if you are hunting in an area with poor browse.
As a result of all this, and a lot of experience processing deer. I recommend the following: For the significant majority of deer the fat in the rib area, the marbling and the skirt itself is fine for grinding so just make an adjustment in the amount of fat you add to the meat when grinding. If there is tallow fat on the upper outer surface of the skirt meat just pop it into the coldest part of the fridge for a while and it will peel right off. The tallow fat at the top of the ribs will be easy to remove before cutting the loins (AKA backstraps) out or splitting the backbone to make bone in chops.
Good luck and I hope you enjoy the results of your efforts.
Lance
I agree with a lot of this from lance..... Some really good info about the deer's diet and age. I remove the silver but I leave the small stuff.It may be easiest to see the difference between tallow fat and the marbling fat over and between the ribs when working with a cold carcass. The tallow fat is the layer over the top of the back and rump and it can be seen as a separate layer that can be worked off the carcass (or primal cut) buy peeling it back while running the tip of a knife under it to separate it, The thicker parts especially will usually come off pretty easily. The thinner parts may need a little more time to trim out but still usually come off cleanly. Very cold meat is a lot easier to work with than warm meat.
What is between the ribs or backing the sheet of skirt meat is not tallow fat and in the big majority of cases it won't have any flavor issues.
I don't know if you are looking for any information on the process of butchering deer but there are a lot of good books and videos around on butchering your own deer. One writer I particularly like is John Weiss. His books on the subject can be found on online. Over the years I've taught several folks how I butcher deer (there are a lot of ways to go about it) and Weiss' books (I have the 2002 edition of Butchering Deer) are particularly nice as they basically lead you through all the prep, meat cutting and storage steps while offering multiple ways to prepare and cut each major part. I've found his books used online for a lot less than new and have given several copies away to folks I was helping out.
Lance