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The Indian Journal of Small Ruminants
Year : 2009, Volume : 15, Issue : 1
First page : ( 55) Last page : ( 61)
Print ISSN : 0971-9857. Online ISSN : 0973-9718.

Cytogenetic characterization of Coimbatore sheep

Devendran P.*, Murali N., Panneerselvam S.

Department of Animal Genetics and Breeding, Veterinary College and Research Institute, TANUVAS, Namakkal - 637 002, Tamil Nadu.

*E-mail address: devauma@yahoo.com

Received:  3  November,  2008; Accepted:  27  December,  2008.

Abstract

The present study was conducted to assess the chromosome profile and morphometric characteristics of Coimbatore sheep. The diploid chromosome number was found to be 54 (2n). The first three pairs of autosomes were bi-armed, metacentric and the remaining 23 pairs of autosomes were acrocentric. The X-chromosome was the largest acrocentric and the Y-chromosome was the smallest metacentric. The mean relative length varied between 1.83 and 9.18. The biarmed autosomes contributed 24.9% of the total genome while X- and Y-chromosomes contributed 5.12 and 1.80%, respectively. The morphometric characteristics viz. arm ratio, centromeric indices (CI1 and CI2) and morphological index confirmed the metacentric nature of biarmed chromosomes. The GTG-banding patterns of chromosomes were similar and on par with the standard karyotype (ISCNDB, 2000) and facilitated easy pairing and identification of chromosomes.

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Key words

Coimbatore sheep, Chromosomes, GTG-banding, Morphometric characteristics, Relative length.

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