Search results for "breed"

BIOLOGY OF THE WREN, TROGLODYTES TROGLODYTES, IN A MEDITERRANEAN INSULAR AGROECOSYSTEM

2009

In the last years many species of birds have exploited urban and suburban habitats, taking opportunistically advantage of human presence for their niche parameters. The Wren is one of them and shows a high variability in the choice of nesting sites in the gardens of the outskirts of Palermo (Sicily). For many years the authors studied the breeding habits of this small bird, and thanks to the video-tape recordings on the nests, they were able to gather new information on its feeding habits and parental care. They could establish the role played by both parents, the different prey types carried to the chicks, and other data, scarcely known in the southern part of distribution of this passerin…

Utilizzo dell’embriogenesi gametica per il miglioramento genetico dei Citrus.

2013

Ottenimento di triploidi mediante coltura in vitro di semi di Citrus clementina Hort. ex Tan., cv. Monreal Bianco e Monreal Verde.

2011

STUDY ON GAMETIC EMBRYOGENESIS VIA IN VITRO ANTHER AND ISOLATED MICROSPORE CULTURE IN FRUIT CROPS

2014

Fruit breeding is mainly based on both conventional (hybridization, mutation and selection) or biotechnological methods (somatic hybridization, genetic transformation and haploid production). The genetic improvement through the conventional methods is limited by many factors such as fruit trees long juvenile period, high heterozygosity, large size and sexual incompatibility. Haploids and doubled haploids, obtained through gametic embryogenesis have a potential use in fruit crops genetic improvement. The change of the microspores fate from the normal gametopytic pathway towards the sporophytic induction is affected by numerous factors. Genotype, medium composition and stress were considered …

La biodiversità delle formazioni naturali e seminaturali in Sicilia: cambiamenti e ipotesi di gestione

2009

A large part of the natural formations that occupied the surface of Sicily have disappeared because of heavy transformations beginning from the ancient time. These transformations have provoked the disappearance of entire communities plants and animals but the entity of these modifications can be only partially appreciated or assumed on the base of fragmentary data. Scope of this study is to evaluate changes in plant and animal communities in the course of the centuries. Until the end of the nineteenth century on the whole an equilibrium was established in the Island. The agricultural activity had surely changed the proportions of the habitats contributing to the spread of open spaces commu…

Reproductive characteristics and differential response to seasonal temperatures of Blue and Great Tits (Cyanistes caeruleus & Parus major) in three n…

2011

The breeding ecology of the Blue Tit (Cyanistes caeruleus) and Great Tit (Parus major) was studied for 18 years in three different neighbouring habitats in Sicily, comprising oakwoods, reforested pine and a reforested mix of pine and broad-leaved trees. Both Blue and Great Tits laid eggs up to two weeks earlier in oakwoods than in the reforested areas. Our results indicate a statistically greater breeding success for both species in the oakwoods compared to reforested habitats, with the mixed reforested habitat having a greater success than that of reforested pine habitat. We also correlated reproductive characteristics with local air temperature to verify if the laying date of tits advance…

Two-dimensional difference in gel electrophoresis (2D-DIGE) for milk proteins characherization in Girgentana goat breed

2015

Milk proteomics has rapidly become an eligible approach, since the protein fraction constitutes the most biologically relevant component in milk. Proteomic applications can vary greatly from straightforward protein identification to complex characterization of post-translational modifications and protein-protein interactions. The aim of this work was to compare protein profile of Girgentana whole milk samples between lactation periods and geographical areas by two dimensional difference in gel electrophoresis (2D-DIGE). Milk samples were collected in two flocks located in two different areas of Sicily at three different time points from calving: 30, 55, and 120 days, respectively. Protein p…

Genome wide Copy Number Variation (CNV) detection in Cinisara cattle breed

2017

Copy Number Variations (CNVs) are classes of polymorphic genomic regions including deletions, duplications and insertions of DNA fragments from at least 0.5 kb up to several Mb. CNV represents an important source of genetic variability that provides genomics structural information complementary to the single nucleotide polymorphism (SNP) data. Some CNVs have been shown to be important in both normal phenotypic variability and disease susceptibility in livestock. Several approaches to identify CNVs including FISH, aCGH, SNP array or NGS, were proposed and among these SNP genotyping is relatively low cost, high-throughput and high coverage method. The aim of this study was to identify the CNV…

Comparison of Genome Wide Association Studies for milk production traits in Valle del Belice dairy sheep

The great achievements in livestock species selection during the last 50 years largely relied on quantitative genetic theory and infinitesimal genetic model. In the last 20 years, due to the application of advanced techniques in molecular genetics and statistics, several chromosomal regions that influence quantitative traits have been discovered. Combinations of molecular and classical quantitative information in a composite selection index have been proposed to increase the accuracy of selection. Nowadays, many genotyping arrays for thousands of SNPs are available for several livestock species, such as: cattle, sheep, pigs, horses, goat and chickens. The overall aim of this thesis is the c…

High-density SNP markers elucidate the genetic divergence and population structure of Noticiana sheep breed in the Mediterranean context

2023

Among livestock species, sheep have played an early major role in the Mediterranean area. Italy has a long history of sheep breeding and, despite a dramatic contraction in numbers, still raise several local populations that may represent a unique source of genetic diversity. The Noticiana is a breed of the south-eastern part of Sicily appreciated both for its dairy products and for its resistance to harsh environment. In this study, the high-density Illumina Ovine SNP600K BeadChip array was used for the first genome-wide characterization of 48 individuals of Noticiana sheep to investigate its diversity, the genome structure and the relationship within the context of worldwide and Italian br…