To the best of my knowledge, there is no such compilation. Many of the shows have their own results service on their websites but these vary in terms of accuracy/usefulness - some for instance only list the exhibitor and not the name of the animal. Some of the Breeders' Clubs list major winners. Whilst I can see the advantage of a comprehensive results service, it gets quite unwieldly. Take the Three Counties Show for example, one of the major shows in the calendar.
There are 8 breed sections each with 5 classes + a group class, male, female and Breed Champions. If you report just 1st, 2nd and 3rd, that is 48 classes x 3 = 144 listings + 48 Champs (incl Reserves) Then there's the BPA Pig of the Year Qualifiers (10), Young Pig of the Year Qualifiers (4), Pairs Champs (2) Supreme Champ, Kune Kunes (3 classes + Champs) = 12. Then on the third day, there's a special Rare Breeds Pig Show with a similar number of results.
There's probably a dozen shows during the season of similar complexity plus around 30 smaller shows.
In other words, it would be a major undertaking. Anyone volunteering?