EthicsĀ statement
This study was performed according to the animal welfare guidelines of
the World Organization for Animal Health, and animal sampling was
strictly carried out in accordance with guidelines established by the
Ethics of Animal Experiments of Northwest A&F University, Yangling,
China. All protocols were approved by the committee (Permit Number:
2014BAD23B11). The field study did not include endangered or protected
species. No specific permissions were required for the collection of
samples because the samples were collected from public or non-protected
areas.