Search results for " miglioramento"

Suitability of simplified milk recording methods for genetic evaluations using test-day models in dairy sheep

2008

Nowadays in dairy sheep, test-day records are collected monthly under an alternate morning/evening system. This alternate system was implemented because of the steady increase in recording cost per sheep observed in the last few decades. Furthermore, additional modifications to the testing schemes have been proposed to reduce the costs of milk recording. In dairy sheep, the cost for milk recording is indeed too high compared both with individual outputs and with other dairy species. Therefore, the purposes of the present study were: i) to compare estimated breeding values (EBVs) for milk yield using different simplified testing schemes with a test-day sire model; ii) to evaluate the effect …

Genetic parameters for somatic cell score according to udder infection status in Valle del Belice dairy sheep

2010

Metodo per la tracciabilità/autenticazione di prodotti lattiero-caseari mono-razza

2016

Il brevetto consiste in un metodo per l’autenticazione e la tracciabilità genetica delle produzioni lattiero-casearie mono-razza su base molecolare con approccio statistico-probabilistico. Il metodo si basa sull’impiego di tecniche di analisi ad elevata processività (in particolare SNPs genotyping su Bead Chip Illumina) su pool di DNA e sull’applicazione di metodi computazionali innovativi. Il metodo è già stato validato su produzioni lattiero-casearie ovine quali la Vastedda della Valle del Belice (DOP), sia su prodotti lattiero caseari a DOP ottenuti in laboratorio, che su prodotti a DOP reperibili sul mercato. Il metodo può comunque essere esteso, su richiesta, a qualsiasi altro prodotto…

Relazione tra SNPs ai loci caseinici e tipizzazione lattoproteica nella capra Girgentana

2006

La filogenesi della razza Girgentana ancora oggi rimane più o meno sconosciuta sebbene l’ipotesi più valida sembrerebbe quella che la ricollega alla capra Falconeri o Markor (Himalaya). La consistenza numerica della razza nell’ultimi anni ha subito una notevole contrazione, tanto da potersi annoverare tra le razze in via di estinzione. Il latte della capra Girgentana era utilizzato solo per il consumo diretto. Quando è entrato in vigore il regolamento che vietava la vendita del latte al dettaglio, il valore zoo-economico della razza Girgentana è diminuito notevolmente, contribuendo alla contrazione numerica della razza nell’ultimo ventennio. La rivalutazione della razza sarebbe di fondament…

Analysis of acetyl-CoA carboxylase gene polymorphisms in Valle del Belice dairy breeds

2015

Acetyl-CoA carboxylase is the flux-determining enzyme in the regulation of fatty acid synthesis within animal tissues. The expression of the mammary gland isoform of this enzyme, during lactation, is regulated by the acetyl-CoA carboxylase-α (ACACA) gene. The ovine ACACA gene, with 51 coding exons, is responsible for phenotypic variability observed in milk fat content and milk fatty acids (FAs) composition. However, before attempting association analyses between this enzyme and phenotypic traits of interest, a study on the genetic variability within this locus is required. The aim of this work was to sequence the encoding region of ACACA gene in Valle del Belice dairy ewes in order to ident…

BOVITA: a first overview on genome-wide genetic diversity of Italian autochthonous cattle breeds

2017

Analysis of genomic data is increasingly becoming part of the livestock industry and is an invaluable resource for effective management of breeding programs in small populations. The recent availability of genome-wide SNP panels allows providing background information concerning genome structure in domestic animals, opening new perspectives to livestock genetics. BOVITA was established to join local efforts and resources for the genomic characterization of Italian local cattle breeds. Despite the growing diffusion of some cosmopolite specialized breeds, several autochthonous breeds are still bred in Italy. The main aim of the BOVITA is to investigate the genomic structure of Italian local c…

Genome-wide characterization of local cattle breeds from central and western Mediterranean

2017

Following-up on previous studies that investigated genetic relationships among several world-wide cattle breeds using genome-wide SNP data, we focus here on the central and western part of the Mediterranean. Notably, 50K genotypes from 30 Marismeña (Spain); 24 Guelmoise (Algeria); 46 Brune de l’Atlas Fauve, 15 Brune de l’Atlas Grise, and 15 Blonde du Cap (Tunisia); 29 Modicana and 30 Cinisara (Sicily); 24 Podolica Italiana (Southern continental Italy); 34 Chianina and 24 Romagnola (Central Italy); 23 Modenese, 24 Reggiana, 23 Alpine Grey and 50 Pezzata Rossa Italiana (Northern Italy); 50 Bruna Italiana and 50 Frisona Italiana were considered. When included in a world-wide dataset, the three…

Application of SNP reduction approaches and random forest for the identification of population informative markers in cosmopolitan and local cattle b…

2017

In livestock, single nucleotide polymorphism genotyping arrays have been used to differentiate breeds and populations for several downstream applications, including breed allocation of individuals, breeds of origin of crossbred animals, authentication of mono breed products, comparative analyses of selection signatures among several other uses. We already tested a combination of principal component analysis (PCA), used as preselection method, and random forest (RF) used as classification method to assign cosmopolitan Italian breeds with no or very low error rate. In this work, we increased the number of breeds and approaches, to have a more comprehensive view of the strategies available and…

Identification of breed informative single nucleotide polymorphisms for assigning individual in Sicilian dairy sheep

2015

Assignment tests using genetic information to establish population membership of individuals, provide the most direct methods to determine the population of origin of unknown individuals. The identification of the breed or population of origin of individuals potentially offers unbiased tools in livestock and is useful in a variety of biological contexts. The aim of this study was to identify the minimum number of informative SNPs from highthroughput genotyping data in Sicilian dairy sheep breeds, and to investigate their usefulness for breed assignment purposes. Individuals of Valle del Belice (48), Comisana (48) and Pinzirita (53) sheep breeds were genotyped using Illumina OvineSNP50K Geno…

Development of multiplex-PCR protocol to amplify 12S and 16S rRNA genes of mtDNA for traceability of Sicilian mono-species dairy products.

2015

Species identification in dairy sector is important not only to safeguard public health but also to verify compliance with the Production Regulations of many typical dairy products (PDO/PGI). The most common fraud in dairy sector is represented by the mixture of milks from different species, resulting in mislabeling of protected designation of origin (PDO) products. For a rapid, specific and sensitive identification of cattle’s, sheep’s and goat’s milk in mono-species Sicilian dairy products, species-specific multiplex-PCR protocol was developed. DNA from blood and experimental cheeses of Sicilian autochthonous breeds was used to amplify the 12S and 16S rRNA genes of the mitochondrial DNA. …