For example the epd's that Smithfield has on their pigs is far superior to anything in the beef industry because they control the data points and have no reason to lie to some poor unsuspecting soul at a sale or a fool like me gazing through a semen catalog wondering if those epd's could possibly be true.
Pig and cattle EPD data gathering cannot be compared due to the greater number of progeny pigs are capable of and the short period of time it takes to verify that data.
Why would a cattle breeder skew EPD data? Since EPD's are based on contemporary groups, if he jacked up the data on one animal, it would lower the data, and subsequent EPD's, on the rest. I am sure it has been done, but the truth comes out sooner or later.
The biggest problem I see with cattle EPD's is that the 2 year old bulls going into the commercial breeding herd are "Interim" and never proven.
One thing for sure that the pig folks are doing is taking full advantage of heterosis.