CYTOGENETIC STUDIES ON DECCANI SHEEP
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Date
2005-08
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT:
A study was carribd out on 30 Deccani sheep for cytogenetic characterization.
The modal diploid chmosome number was found to be 54 (2~54X, Y). The first
three pairs of the autosomes were sub-metacentric and the remaining 23 pairs of
autosomes wac acrocentric. The X-chromosome was the longest acrocentric, while
Y-chromosome was the smallest biarmed chromosome. Sex of the animal had a nonsignificant influence on the morphomeh-ic measurements of all the &omosomes, whik the diffmcts among the chromosomes wae significant for most of thc mwphomctric measurements. The mean relative kngth of autosomes varied from 1.78 _+ 0.006 to 9.35 + 0.022 per cent. The
Xchromosome contributed 5.05 4 0.006 per cent to the total genome, while the
Y-chromosomc formed 1.70 + 0.007 per cent of the total genome.
The means for the cum ratio, centromeric index and morphological index of
the sub-metacentric autosomes 1, 2 and 3 varied from I. 17 to 1.20, 0.55 to 0.55 and
9-40 to 1 1.57, respectively. The G-banding pattern of the chromosomes obtained in the present study more or less matched with the standard karyotypes. All the autosomes revealed centromeric C-bands. The Xthromosomc did not reveal any centromeric C-bands, while the
Y- chromosome did not stain differently from its arms. The nucloolar organizer
regions were detected on chromosomes 1.2.3.4 and 25.
The cytogenetic studies on Deccani sheep revealed similarities with other
breeds of sheep.
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