The occurrence of 'end-to-end' fusion between adjacent chorioallantoic sacs in the early pig embryo.
D000818:Animals; D005314:Embryonic and Fetal Development; D005321:Extraembryonic Membranes / Q000254:growth & development*; D005260:Female; D007247:Infertility, Female; D011247:Pregnancy; D013552:Swine; D014427:Twins