Search results for "Barbaresca"
showing 4 items of 4 documents
Runs of homozygosity reveal genome-wide autozygosity in Italian sheep breeds
2018
The availability of dense single nucleotide polymorphism (SNP) assays allows for the determination of autozygous segments based on runs of consecutive homozygous genotypes (ROH). The aim of the present study was to investigate the occurrence and distribution of ROH in 21 Italian sheep breeds using medium-density SNP genotypes in order to characterize autozygosity and identify genomic regions that frequently appeared in ROH within individuals, namely ROH islands. After filtering, the final number of animals and SNPs retained for analyses were 502 and 46 277 respectively. A total of 12 302 ROH were identified. The mean number of ROH per breed ranged from 10.58 (Comisana) to 44.54 (Valle del B…
Genome-wide scan of fat-tail sheep identifies signals of selection for fat deposition and adaptation
2018
Fat tail in sheep represents a valuable energy reserve for facing future climate changes. The identification of genes with a role in the fat-tail phenotype may contribute to understanding the physiology of fat deposition and the mechanisms of adaptation. Genotypic data obtained with the OvineSNP50K array in 13 thin-tail sheep breeds from Italy were used to identify selection signatures of fat tail through pairwise thin- versus fat-tail sheep breed comparisons, with the following fat-tail breeds of the Mediterranean area: two unique Italian fat-tail breeds (Barbaresca and Laticauda), a Barbary sheep breed from Libya, Ossimi breed from Egypt, Cyprus Fat-Tail and Chios from the Greek islands …
Genetic diversity and population structure of Sicilian sheep breeds using microsatellite markers
2012
Abstract Genetic diversity studies in domestic animals aim at evaluating genetic variation within and across breeds mainly for conservation purposes. In Sicily, dairy sheep production represents an important resource for hilly and mountain areas economy. Their milk is used for the production of traditional raw milk cheeses, sometimes protected designation of origin (PDO) cheeses. In some cases, the quality of these products is linked to a specific breed, i.e. mono-breed labelled cheeses and it is therefore important to be able to distinguish the milk of a breed from that of others, in order to guarantee both the consumer and the breed itself. In order to investigate the genetic structure an…
Genetic and environmental sources of variation for milk yield traits in Barbaresca siciliana breed
2001
Abstract Multi-trait animal model procedures were used to calculate variance for milk yield traits in the Barbaresca siciliana breed. The recorded data consisted of 14 791 lactations from 6678 ewes distributed among 44 herds from six provinces in Italy. The data-set with pedigree information used for the estimation of genetic parameters and correlation, included 6678 ewes with records, 757 dams, 4 paternal grandams, 28 maternal grandam and 2 maternal great-grandams, all without records, and additionally 301 sires, 3 paternal grandsires, 11 maternal grandsires and 1 maternal great-grandsires. The variables considered in the present study were the milk yield at 100 days (MY-100), 120 days (MY…