3Straw B, Bates R, May G. Anatomical abnormalities in a group of finishing pigs: prevalence and pig performance. J Swine Health Prod, 2009, 17(1): 28-31.
4Petersen HH, Nielsen EO, Hassing AG, Ersboll AK, Niel- sen JP. Prevalence of clinical signs of disease in Danish finisher pigs. Vet Rec, 2008, 162(12): 377-382.
5Searcy-Bernal R, Gardner IA, Hird DW. Effects of and factors associated with umbilical hernias in a swine herd. J Am Vet Med Assoc, 1994, 204(10): 1660-1664.
6Brewer S, Williams T. Finally, a sense of closure? Animal models of human ventral body wall defects. Bioessays, 2004, 26(12): 1307-1321.
7Brewer S, Williams T. Loss of AP-2a impacts multiple aspects of ventral body wall development and closure. Dev Biol, 2004, 267(2): 399-417.
8Acloque H, Adams MS, Fishwick K, Bronner-Fraser M, Nieto MA. Epithelial-mesenchymal transitions: the importance of changing cell state in development and disease. J Clin lnvest, 2009, 119(6): 1438.
9Drinker N, Krieglstein K. Tg2-/-Tgl3double knockout mice display severe midline fusion defects and early em- bryonic lethality. Anat Embryol, 2002, 206(1-2): 73-83.
10Baum B, Settleman J, Quinlan MP. Transitions between epithelial and mesenchymal states in development and disease. Semin Cell Dev Biol, 2008, 19(3): 294-308.