Joint International Research Laboratory of Animal Health and Animal Food Safety;
College of Veterinary Medicine;
Southwest University;
Chongqing;
400715;
China;
Immunology Research Center;
Medical Research Institute;
Southwest University;
Chongqing;
402460;
China;
Laboratory Animal Center;
Southwest University;
Chongqing;
400715;
China;
Low Ca diet; Ca retention; Microbiota; Transcriptional profiling; Hen;