CYTOGENETIC CHARACTERIZATION OF MAHABUBNAGAR GOATS
| dc.contributor.advisor | Ramesh Gupta, P(MAJOR) | |
| dc.contributor.advisor | Sakunthala Devi, K | |
| dc.contributor.advisor | Dhana Lakshmi, K | |
| dc.contributor.author | UMA DEVI, P | |
| dc.date.accessioned | 2018-11-13T06:22:23Z | |
| dc.date.available | 2018-11-13T06:22:23Z | |
| dc.date.issued | 2010-07 | |
| dc.description.abstract | ABSTRACT : The research was carried out on Mahabubnagar (34) and non-descript goats (13) for cytogenetic characterization by the short term lymphocyte culture technique. A total of 1050 metaphase spreads were examined for the chromosome count and morphology and for Mahabubnagar goats 170 karyotypes and for non-descript animals 75 karyotypes of were prepared. The diploid chromosome number in all the goats was found to be 2n = 60, XY in males and 2n = 60, XX in females. All the autosomes were acrocentric in morphology. The X-chromosome was the longest acrocentric, while the Y-chromosome was smallest and dot-like in appearance in majority of the karyotypes examined. In few metaphase spreads, it was submetacentric in appearance. The data on relative length were converted into angles using arcsin transformation for conducting the least squares analysis. The variation in relative length of the chromosomes was not significant between animals in Mahabubnagar goats, while it was significant for the autosomes 1 to 11 and 19 to 29 in non-descript goats. The effect of genetic group, sex of the animal, coat color and presence or absence of horns, beard and wattles on relative length of the chromosomes was found to be non-significant. The overall least squares mean relative length of autosomes, X- and Y-chromosomes varied from 2.029 to 4.825 percent, 5.164 and 1.961 percent respectively. Among the genetic groups, sexes, coat colours and presence or absence of horns, beard and wattles the least squares means for relative length ranged from 1.975 to 4.937, 1.922 to 4.828, 2.041 to 5.065, 1.982 to 4.856, 1.985 to 4.915 and 1.950 to 5.042 percent, respectively for autosomes and for the X-chromosome ranged from 5.010 to 5.320, 5.147 to 5.181, 4.984 to 5.405, 5.105 to 5.224, 5.104 to 5.224 and 4.944 to 5.388 percent, respectively. The contribution of Y-chromosome to the total genome was 0.457 and 0.509 percent in Mahabubnagar and non-descript goats, respectively. The Y-chromosome overall mean arm ratio, centromeric index and morphological indices were 1.68, 39.22 percent and 214.00, respectively, confirming its submetacentric morphology. In the present investigation with 42 metaphase spreads, a total of 213 NORs were detected in Mahabubnagar goats. The mean number of NORs per metaphase was 5.071, which ranged from 4.72 to 6.17, where as the number of NORs per metaphase ranged from 1 to 13. The highest frequency (P<0.05) of metaphases (21.43%) examined had one NOR, while the lowest frequency (2.38%) had 9 or 11 NORs. The outcome of the present study have revealed that the morphology, number and various morphometric measurements of the chromosomes of the Mahabubnagar goats were analogous to those reported in literature for descript breeds of goats in India like Bengal, Pashmina, Gaddi and local goats like Kanni Adu of Tamil Nadu and local goats of Rohilkhand region. Therefore, the Mahabubnagar goats may be recognized as a distinct breed of Andhra Pradesh State. | en_US |
| dc.identifier.uri | http://krishikosh.egranth.ac.in/handle/1/5810083307 | |
| dc.keywords | MAHABUBNAGAR GOATS;CYTOGENETIC CHARACTERIZATION | en_US |
| dc.language.iso | en | en_US |
| dc.pages | 99 | en_US |
| dc.publisher | SRI VENKATESWARA VETERINARY UNIVERSITY TIRUPATI - 517 502. (A.P.) INDIA | en_US |
| dc.sub | Animal Genetics and Breeding | en_US |
| dc.subject | null | en_US |
| dc.theme | CYTOGENETIC CHARACTERIZATION OF MAHABUBNAGAR GOATS | en_US |
| dc.these.type | M.V.Sc. | |
| dc.title | CYTOGENETIC CHARACTERIZATION OF MAHABUBNAGAR GOATS | en_US |
| dc.type | Thesis | en_US |