Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses

In early April 1983, a stranded Malaysian gaur (Bos gaurus hubbacki) mated with a group of Sahiwal-Friesian dairy heifers and this resulted in the birth of an inter-specific hybrid calf named SELEMBU. In this study, chromosome analysis of four Malayan gaur (Bos gaurus hubbacki), ten Sahiwal-Fries...

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Main Author:	Kamalludin, Mamat Hamidi
Format:	Thesis
Language:	English English
Published:	2009
Subjects:	Cattle - Cytogenetics Veterinary genetics Cattle - Breeding
Online Access:	http://psasir.upm.edu.my/id/eprint/10708/1/FP_2009_29_A.pdf
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id	my-upm-ir.10708
record_format	uketd_dc
spelling	my-upm-ir.107082013-05-27T07:46:49Z Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses 2009-10 Kamalludin, Mamat Hamidi In early April 1983, a stranded Malaysian gaur (Bos gaurus hubbacki) mated with a group of Sahiwal-Friesian dairy heifers and this resulted in the birth of an inter-specific hybrid calf named SELEMBU. In this study, chromosome analysis of four Malayan gaur (Bos gaurus hubbacki), ten Sahiwal-Friesian cattle and seven hybrid backcrosses was undertaken to determine their karyotype status and differences. The gaur and cattle has chromosome complements of 2n = 56 and 2n = 60, respectively. Two types of chromosomal arrangements of the backcrosses were observed; namely an intermediate to the parental species (2n = 58) and a cattle type (2n = 60). The backcrosses with 2n = 60 shared similar chromosomal arrangement and banding characteristics of the cattle. Backcrosses with 2n = 58 exhibited the non-homology of two submetacentric and two acrocentric autosomes, where the variations were inherited from the parental species that possessed different karyotypes. A comparison of the gaur with cattle, as the model of the ancestors of the modern bovids, showed structural and characteristic differences in their karyotypes. The gaur exhibited two pairs of submetacentric chromosomes and lacked two chromosome pairs, which had resulted from Robertsonian translocations during their karyotype evolution. Banded karyotypes revealed extensive similarities of chromosomes 1 and 2 of the Malayan gaur to the homologous acrocentric chromosomes of cattle. For the first time, chromosome 1 of the gaur was identified to contain an ancient origin inverted segment compared to cattle, which was homozygous in all the studied gaur samples. The intensity of the C-bands on chromosomes 1 and 2 suggested that the translocations occurred at different periods of time during the karyotype evolution. Cattle - Cytogenetics Veterinary genetics Cattle - Breeding 2009-10 Thesis http://psasir.upm.edu.my/id/eprint/10708/ http://psasir.upm.edu.my/id/eprint/10708/1/FP_2009_29_A.pdf application/pdf en public masters Universiti Putra Malaysia Cattle - Cytogenetics Veterinary genetics Cattle - Breeding Faculty of Agriculture English
institution	Universiti Putra Malaysia
collection	PSAS Institutional Repository
language	English English
topic	Cattle - Cytogenetics Veterinary genetics Cattle - Breeding
spellingShingle	Cattle - Cytogenetics Veterinary genetics Cattle - Breeding Kamalludin, Mamat Hamidi Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses
description	In early April 1983, a stranded Malaysian gaur (Bos gaurus hubbacki) mated with a group of Sahiwal-Friesian dairy heifers and this resulted in the birth of an inter-specific hybrid calf named SELEMBU. In this study, chromosome analysis of four Malayan gaur (Bos gaurus hubbacki), ten Sahiwal-Friesian cattle and seven hybrid backcrosses was undertaken to determine their karyotype status and differences. The gaur and cattle has chromosome complements of 2n = 56 and 2n = 60, respectively. Two types of chromosomal arrangements of the backcrosses were observed; namely an intermediate to the parental species (2n = 58) and a cattle type (2n = 60). The backcrosses with 2n = 60 shared similar chromosomal arrangement and banding characteristics of the cattle. Backcrosses with 2n = 58 exhibited the non-homology of two submetacentric and two acrocentric autosomes, where the variations were inherited from the parental species that possessed different karyotypes. A comparison of the gaur with cattle, as the model of the ancestors of the modern bovids, showed structural and characteristic differences in their karyotypes. The gaur exhibited two pairs of submetacentric chromosomes and lacked two chromosome pairs, which had resulted from Robertsonian translocations during their karyotype evolution. Banded karyotypes revealed extensive similarities of chromosomes 1 and 2 of the Malayan gaur to the homologous acrocentric chromosomes of cattle. For the first time, chromosome 1 of the gaur was identified to contain an ancient origin inverted segment compared to cattle, which was homozygous in all the studied gaur samples. The intensity of the C-bands on chromosomes 1 and 2 suggested that the translocations occurred at different periods of time during the karyotype evolution.
format	Thesis
qualification_level	Master's degree
author	Kamalludin, Mamat Hamidi
author_facet	Kamalludin, Mamat Hamidi
author_sort	Kamalludin, Mamat Hamidi
title	Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses
title_short	Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses
title_full	Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses
title_fullStr	Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses
title_full_unstemmed	Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses
title_sort	cytogenetic studies of malayan gaur (bos gaurus hubbacki), sahiwal-friesian cattle and their hybrid backcrosses
granting_institution	Universiti Putra Malaysia
granting_department	Faculty of Agriculture
publishDate	2009
url	http://psasir.upm.edu.my/id/eprint/10708/1/FP_2009_29_A.pdf
_version_	1747811179654283264

Cytogenetic Studies of Malayan Gaur (Bos Gaurus Hubbacki), Sahiwal-Friesian Cattle and Their Hybrid Backcrosses

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