In humans and the great apes, uric acid is the end product of purine degradation, whereas in other mammals including pigs, it is further degraded into allantoin by uricase, an enzyme that is mostly found in the liver. Uricase enzyme is non-functional in humans due to missense mutation in the gene. Allantoin is more soluble in water than uric acid. Therefore, the claim that pig muscles contain high amount of urine (uric acid) is a matter of debate. May be, it is the allantoin that is deposited in the muscles in case of hyperuricemia. This hypothesis can be further testing by experimental analyses.
Pigs and Human Health