Morphological and genetic characterization of Ganjam sheep

Ganjam is an important sheep breed in the Orissa State in the eastern region of India. They are reared mainly for meat. The present study was conducted to characterize the Ganjam breed both phenotypically and genotypically at the DNA level using microsatellite markers. A survey was conducted in the breeding tract to study the habitat, body biometry, management practices and reproductive and productive performance of Ganjam sheep. A total of 604 animals were studied for morphological characteristics. The animals are medium sized with hairy fleece. Their coat colour varies from brown to dark tan. The average flock size is 35. Measurements were recorded for body weight, body length, height at withers, chest girth, ear length and horn length in 366 adult animals. A set of 25 microsatellite markers was used to assess the genetic variability in 50 DNA samples extracted from randomly collected blood samples of unrelated Ganjam sheep across their breeding tract. A total of 137 alleles were identified across the 25 markers. The allele diversity (5.48), mean observed heterozygosity (0.623) and gene diversity (0.685) estimates elucidated substantial genetic diversity within the Ganjam breed. The Mode Shift Test implied that a reduction in the effective population size or a recent genetic bottleneck was very unlikely in this indigenous breed of sheep. The within population inbreeding estimate values for the investigated population (0.087) showed a low rate of inbreeding.