Funding for this research was provided by:
Japan Society for the Promotion of Science (16K08015)
Livestock Promotional Subsidy from the Japan Racing Association
Received: 27 February 2020
Accepted: 23 November 2020
First Online: 6 January 2021
Ethics approval and consent to participate
: For collection of cecal droppings, each owner gave consent for collection of samples, and the samples were collected by farmers. The farmers did not touch the animals and simply picked up the cecal droppings. The Institutional Animal Care and Use Committee of the Graduate School of Agriculture and Life Sciences, the University of Tokyo, confirmed that the study did not require approval.
: Not applicable.
: The authors declare that they have no competing interests.