Chromosomal abnormalities in hypoprolific boars

Pour new chromosomal rearrangements are reported in the domestic pig: 3 rec iprocal translocations, rcp(4;12)(p13;q13) in a crossbred boar, rcp(1;7)(q1 7;q26) in a Large White purebred boar, rcp(1;6)(q17;q35) in a purebred synt hetic paternal line boar, and a pericentric inversion inv(2)(p13q11) in a c rossbred boar. The 1/7 reciprocal translocation and the pericentric inversi on were detected in animals that had sired small litters. The effect of the 1/7 translocation was accurately determined: - 4.5 piglets born per litter , i.e. - 36 %. Both the 1/6 and 1/7 reciprocal translocations were of mater nal origin. All the chromosomal rearrangements were highlighted using GTG a nd/or RBG banding techniques. Chromosome painting experiments were also car ried out to cofirm the proposed hypotheses for the three reciprocal translo cations.