CYTOGENETIC STUDIES ON ONGOLE BREED OF CATTLE
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Date
2010-07
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SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA
Abstract
ABSTRACT:
A cytogcnctic study was conducted on 38 Ongole cattle maintained at
Livestock Research Station, Lam. Ciuntur and nearby villages by utilizing shortterm
lymphocyte culture technique. The normal diploid chromoso~nen umber was
60 which consisted of 29 pairs of acrocentric autosomes and one pair of sex
chromosomes. The X-chromoson~e was sub-mctnccntric and Y clirolnosome \vils
acrocentric. The ~norphometric measurements of clir.o~nosorncs obtained li.0111
farm bred aninials and those from ficld animals clid not diffr signific:lntly. l'he
relative lengths (RL) of chrornoso~ncs I, 5, 6, 15, 16, 17, 15, 23, 24, 25, 26, 27,
28, 29 and X clwomosome were significantly different anlong the sexes. The RL
of autosolnes ranged from 1.92 + 0.01 to 5.24 * 0.02 per cent. The Xchromosome
was the longest while Y-chi-ornosome was the shortest and
contributed 5.42 + 0.03 and 1.79 + 0.02 per cent to the genome. The decline in the
RL of the chromosomes was sha1-p lio~lI ~to 3 and was gradual thercaficr. The
arm ratio, ccnt~x~meriicn dex and moi.phological intlcv fbr thc X-chromosome
were 1.87 + 0.015, 0.35 * 0.002 ant1 5.75 + 0.075, respectively.
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