Three additional pretransferrin types have been identified by one-dimensional PAGE technique in New Zealand White and Californian rabbits. The six alleles are designated PrtA, PrtB, PrtC, PrtD, PrtE and PrtF. It is likely that three of these six alleles are identical to those reported previously.
A total of 243 female pigs were tested for 9 different genetic polymorphisms, and the results were related to production traits. The genetic systems studied were the blood groups A, E and H, the proteins Phi, Po2, Pgd, Pil and Tf, and the class I lymphocyte antigens of the swine major histocompatibility complex (SLA). The production traits were growth rate, carcass quality (muscle/ fat ratio) and meat quality (as measured by pH, water holding capacity and reflectance). The animals were from the Large-White (LW) and French Landrace (LF) breeds, which differed in allelic frequencies at most loci. Among the genetic systems studied, only SLA showed a marked association with production traits. Although there was no association with growth rate, in either breed, certain SLA haplotypes were associated with meat quality (reflectance) in the LW. In both breeds, there was a close association between SLA and carcass leanness, although the same haplotype was surprisingly associated with a lower fat content in the LW and with a higher fat content in the LF. This finding indicates that caution is required in the interpretation of such studies, without a fuller understanding of the metabolic processes concerned.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.