being raised on a farm where we raised purebred polled Herefords I can say without reservation there is in fact a distinct difference in not only flavor but texture as well.
the fat on a Hereford is a darker yellow than other breeds and it is not due to being fed out on grass or corn,it is their nature and that fat has a flavor all its own that contributes greatly to the overall flavor of the meat of whichever cut.
when angus and charolais rolled into town thanks to a huge advertising scheme as the bigger,faster growing,more tender beef we switched bulls to breed our Herefords as they were bringing better money,big mistake there as the live birth weight of the calves about doubled and killed many of our cows.
those that survived and were butchered were tough and basically flavorless compared to the purebred Hereford.
we learned long ago that hybridizing cattle changed everything about the animal including temperament and not to the good either.
I could go on but I am sure no one would listen as the animals have been so hybridized that there are almost no purebreds left to compare to.
hogs,again,purebreds rule the day for texture and flavor,buy hog parts today and they smell and taste exactly like the confinement they came out of unless you are lucky enough to find free range hogs,trust me on that one.
that gray scum you see in the crockpot floating at the top?? that never used to be there in any hog raised naturally,nor did it stink.
anyone who has skinned gut shot rabbits or muskrats understands that.
in the fall we turned our hogs out to the timber to clean up acorns and hickory nuts,talk about something that would drastically change the flavor for the better!!!!! very very hard to find hogs fed out this way and you will pay big $$$$$$ for it when you do.
sorry to go on like I did Denny,but yes, purebred vs hybrids,environment,feeds,meds,all play a very big part in flavor at the table.