The invention relates to a
genetic marker for screening the combined
gene model of the fourth and tenth
exon variation sites of a
common disease resistance BPI (bactericidal / permeability increasing
protein)
gene of pigs, and belongs to the technical fields of genetic breeding and
molecular marker assisted selection of pigs. The method comprises the following steps of: extracting
DNA (deoxyribonucleic acid) of a pig
genome of a sample to be tested, and performing PCR (
polymerase chain reaction) amplification on the pig
genome; analyzing the PCR product of the
exon 4 through SSCP (
single strand conformation polymorphism), and performing
enzyme digestion on the PCR product of the
exon 10 through
restriction enzyme HpaII, wherein when the
gene model of the pig body to be tested is a CDAB model, the pig body is strong in
common disease resistance. According to the application, a molecular
genetic marker with higher efficiency and accuracy is provided to
molecular marker assisted selection of the pig
disease resistance breeding work, and an effective
molecular marker breeding means is provided for improving the
common disease resistance and immune response capability of piglets. The detection method is simple in operation, low in cost and high in accuracy, can realize automatic direct detection, and takes a magnificent effect in
pig breeding.