Received: 11 December 2019
Accepted: 17 July 2020
First Online: 29 July 2020
: Animal welfare approval was not needed for this study since all data came from animals raised in a commercial setting by The Maschhoffs LLC (Carlyle, IL, USA) under routine conditions. All pigs were collected in commercial facilities under the supervision of the USDA Food Safety and Inspection Service.
: Not applicable.
: The authors declare that they have no competing interests.