Rimesse e sviluppo locale nel sistema migratorio del Golfo Persico

The thesis concerns, from an economic and institutional point of view, the migration process in connection with development issues, focusing on the Middle East and North Africa region. Adopting a south-south perspective of migration flows, which is focusing on migration from the Maghreb and Mashreq towards the GCC, the research focuses on the linkage between migration and local development (LED), considering the economic implication that temporary migration flows (trough physical and human capital accumulation) have for the labour exporting countries of the region. Since south-south migration flows are both temporary and skilled, the research points out that return migrants from the GCC can have a significant impact for the growth of recipient countries, as they transfer capital through remittances on regular basis and, once back, they can use human capital acquired abroad to promote economic initiatives. Starting from the descriptive analysis on international migration flows (from an historical to a systemic point of view), and focusing on the patterns of people movements in the Gulf Migration System and on the role remittances have in the region as a strategy for both household survival and local development, the research considers the economics of migrant remittances from a micro and macro perspective and the main direct and indirect effects that remittances have on the local communities. The review of the economic literature on international remittances and on local development shows how migration is an alternative strategy of financing local economic development (LED) especially for low-middle income countries (among them the Maghreb countries). The linkage between return migration, remittances, human capital formation and the promotion of local development in the Egyptian case is the focus of the empirical investigation.

Embryo transfer as a tool to disseminate k-casein BB genotype and improve milk clotting properties

Dairy industries are asked to be increasingly competitive and efficient. Despite the increasing trend in milk yield and protein content during the last decade genetic selection, milk coagulation ability has diminished and even if the absolute amount of cheese produced has increased, the relative cheese yield from a set amount of milk, has decreased. As casein content and variants, along with milk clotting properties (MCP) are determined to a large extent at DNA level, genetic selection and embryo transfer can provide efficacious tools to reverse this trend and achieve improvements. The aim of the proposed research was to determine how rapidly and to what extent milk coagulation properties could be improved by using embryo transfer (ET) as a tool to increase the frequency of k-casein BB genotype cattle and reducing A and E variants in an Italian Holstein herd with a low prevalence of the favourable genotype. In the effort to optimize superovulation protocols and results, synchronization of wave emergence was performed through manual transrectal ablation of the largest (dominant) ovarian follicle on days 7 or 8 of the cycle (estrus = day 0); different drugs and dosage for the superstimulation protocol were experimented trying to overcome the negative effects of stress and the perturbance of LH secretion in superovulated highly producing lactating cows and the use of SexedULTRA™ sex-sorted semen, for artificial insemination of superovulated cows was reported for the first time. The selection program carried out in this research, gave evidence and gathered empirical data of feasible genetic improvements in cheesemaking ability of milk by means of k-casein BB selection. In conclusion, in this project, selection of k-casein BB genotype markedly enhanced cheese-making properties of milk, providing an impetus to include milk coagulation traits in genetic selection and breeding programs for dairy cattle.