Binary hybridization refers to a generation of hybrid pigs obtained by mating external male boars with external sows or exogenous boars and local sows. The first-generation hybrid sows selected by the binary hybrids are mated with the third-type boars to be ternary hybrids. For example, the Duroc boar is the male parent, and the hybrid sows selected by the hybridization of the Changbai boar and the large white sow are mated for the female parent. The obtained Du Changda second-generation hybrid pig is the ternary pig. SARS-CoV-2 IgM/IgG Duo Test (Colloidal Gold) SARS-CoV-2,IgM/IgG Duo,SARS-CoV-2 antibody,COVID-19 antibody,Colloidal Gold Shenzhen Uni-medica Technology Co.,Ltd , https://www.unimedicadevice.com