Received: 20 May 2019
Accepted: 14 August 2019
First Online: 28 August 2019
: Procedures for the mapping population were approved by the Institutional Animal Care and Use Committee at Virginia Polytechnic Institute and State University. Procedures for the tissue sample collections followed by the guidelines of Institutional Animal Care and Use Committee at Texas A&M University College of Veterinary Medicine & Biomedical Sciences.
: Not applicable.
: The authors declare that they have no competing interest.