CHROMOSOMAL PERICENTRIC-INVERSION DETECTED IN A SOW AND HER PIGLETS

Forty-four pigs with the suspicious symptoms of porcine stress syndrom e (PSS) were selected for chromosome analysis. Cytogenetic evaluation by means of the G-banding technique revealed that one sow had an abnor mal {(38,XX, inv (1p+q-) (2.1;1.1)} karyotype. The same abnormality wa s also detected in 8 of 13 offspring of this sow. However, there was n o correlation between the chromosome abnormality and PSS. The chromoso me abnormality did not give rise to a reduction in the fertility of th is sow or in the viability of her offspring. This case represents the first reported instance of pericentric inversion in swine.