CHROMOSOME CHARACTERISATION OF MALABARI GOATS AND ITS CROSSES IN KERALA
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Date
1992-03-10
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Journal Title
Journal ISSN
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COLLEGE OF VETERINARY AND ANIMAL SCIENCES Mannuthy - Thrissur
Abstract
The chromosome prolile ot qoats v.'as bruored wiuh o vie
to find its number, to prepare the karyotypes of female and
male goats of the Malabari and its crosses with Saanen and
Alpine and to assess its morphom-etr ic values. The
experiments were carried out in jugular blood lymphocytes.
The cultures were prepared using RPMl 1640 as the rr>edium.
The comparative efficacy or different m.xtogens viz.
PHA, PWM and their combination, with different incubation
time, revealed that the combination of PHA and PWM at an
incubation period of 70.5 h yielded the optimum results
The diploid number of chromosomes in all the genetic
groups of goats were found to be 60. Autosomes as well as X
chromosomes were found to be acrooentric. The X chromosome
was quite prominent ii nrn bei.-.Ofg- rlop iQnnodir of all. The Y
chromosome was the shortest and the only metacontric in the
complement.
In karyotypes of the three genetic groups, it was
observed that twenty-nine homologous pairb of autosome
formed a closely graded serlarion. Sexuai dimorphism v,/as
. . , .o., ,-,f y ^r-.d Y chromosomes in
exhibitcG wiLn an uiiA-^;uai --
nf Y e'">-orr,r,c:r,mr-s in the females,
males anu an equal t^a . .. or ..
The relative length was estimated for each pair or
chromosomes in percentage. The X chromosome contributed to
more than five per cent of the total complement length in
all the three genetic groups. In Malabari, Saanen x
Malabari and Alpine x Malabari, the relative length of the Y
chromosomes were 1.552+0.10, 1.321+0.09 and 1.548+0.10
respectively.
The analysis of variance of relative length of X
chromosomes revealed a significant difference among the
three genetic groups.
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