Funding for this research was provided by:
Schweizerischer Nationalfonds zur Förderung der Wissenschaftlichen Forschung (IZCOZ0_177141, 31003A_173171/1)
China Scholarship Council
Article History
Received: 11 March 2019
Accepted: 5 November 2019
First Online: 21 November 2019
Ethics approval and consent to participate
: Treatments of gilts were approved and performed with permission of the local authorities (District Government of Upper Bavaria). Experiments with gilts were performed following in the International Guiding Principles for Biomedical Research Involving Animals as proposed by the Society for the Study of Reproduction, with the European Convention on Animal Experimentation, and with the German Animal Welfare Act.
: Not applicable
: The authors declare that they have no competing interests.