Start Date: Aug 14, 2008
End Date: Jul 31, 2013
To achieve the research goals it is imperative to increase the number of animals available to study this Prnp polymorphism. One female calf of the 2006 BSE case was identified and carries the E211K allele. The specific objectives are to be accomplished through the production of multiple offspring from this E211K heifer through superovulation and embryo transfer. Approximately 50% of the offspring will be heterozygous for the E211K polymorphism while the others will serve as genetically matched non-E211K controls. Collection of semen from an E211K heterozygous bull will allow creation of E211K homozygotes. To protect this unique resource immediate collection of embryos is necessary. The initial goal is to harvest 134 embryos that should result in approximately 62 pregnancies (half of which will carry the E211K polymorphism) for immediate use in the studies to amplify the E211K material, test for genetic susceptibility to TSE, and develop a breeding group to produce calves for transmissibility studies. To achieve the goal of understanding the role of the E211K polymorphism with regard to genetic BSE we have utilized superovulation and embryo transfer obtaining a E211/K211 containing bull. We are now in a position to collect semen from the E211/K211 heterozygous bull to create K211/K211 homozygotes. To accomplish this goal we plan to collect semen from this bull and through artificial insemination using semen from the E211/K211 bull with superovulation and embryo transplantation using other E211/K211 heterzygotes generate 30-40 embryos resulting in 15-20 pregnancies yielding approximately 5 K211/K211 homozygous animals and 10 E211/K211 heterozyous animals as well as 5 E211/E211 homozygous controls.