It's kind of hard for any of us to tell you what "the taste" that you are detecting is without having tasted the sausages you're talking about! If you're buying them at the grocery store and they have a brand name - it would help to know what it is. If it is a national brand more of us might be able to try it, if a regional brand then someone in the south might be able to pick some up and give them a taste.
One of the things about sausage brands is that they all are blended a little differently. Some of the things you might expect to find in breakfast sausages in various combinations and amounts would be:
sage, savory, nutmeg, allspice, marjoram, cloves, cumin, thyme, rosemary, bay leaf, red pepper flakes, brown sugar, maple syrup, onion, garlic, paprika, black pepper.
For some recipes - that you can read and maybe recognize the flavor or combination of flavors:
For Homemade Breakfast Sausage Rcipes: http://www.google.com/search?hl=en&q...sausage+recipe
For Homemade Sausage Recipes: http://www.google.com/search?hl=en&l...sausage+recipe