cant speak for anybody else but we do them on a rolling number basis pedigree and cross breeds all have the same 3 letters then the numbers for us that weigh and weight record every pig it is a means of identifying each pig some use the rolling number to identify herd book registered pigs others do it the traditional pedigree numbering system which is on the blood line rolling counter basis
the bpa is not clear on which system to use and pigs have been entered in the herd book on both systems even listing the herd book numbers as well which is different again as i said simples