[The karyotype of Paramphistomum cervi (Zeder, 1790) from Korean cattle]
As a series of systematic classification of paramphistomes, the worms in the rumen and reticulum were collected on 214 Korean cattle slaughtered at Jeonju abattoir from January 1986 to April 1987 and were classified by means of morphology. Afterwards, the karyotype of Paramphistomum cervi (Zeder, 1790) was detected by means of modified air-drying method from germ cells of the worms. The results were summarized as follows: In the chromosome number of 254 P. cervi, the haploid cell was n=9 and the diploid 2n=18. The meiotic divisions were observed frequently; 1,924 haploid and 32 diploid cells were reliable. Nine pairs of mitotic chromosomes were homologous in the metaphase stage, and the chromosomes were composed of five medium-sized metacentrics (m), subtelocentrics (st) or submetacentrics (sm) and four small-sized subtelocentrics(st) or submetacentrics(sm). Meiotic metaphase was composed of five medium and four small chromosomes in size. As a series of C-banding method, C-band was showed in centromeric region from all of the haploid germ cells. Whereas chromosome No. 3 and 5 included heterochromatin on the tip region, chromosome No. 4 on the distal region and No. 6 proximal region. And chromosomes No. 2 and 8 showed a remarkable C-band distinguished from other chromosomes.
Rhee
Jae Ku
JK
Department of Veterinary Parasitology, Jeonbug National University, Jeonbug, Korea.
Kim
Yong Hwan
YH
Park
Bae Keun
BK