1,721,187 research outputs found
Decision-making tools for the development of breed strategies
No full textIntroduction to decision-making tools useful for developing strategies for local breeds. Use of SWOT analysis as a proper instrument to tackle the complexity of conservation of local cattle breeds. Contribution of different stakeholders to the development of conservation strategies. SWOT analysis of local cattle breeds across countries. Application of the acquired knowledge to the development of individual local breed strategies and policies
Genetic progress in simulated dairy and dual purpose cattle breeds with small population sizes
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Quadro ematologico in vitelli e vitelloni sottoposti a differenti condizioni di trasporto
No full textGoing Beyond Counting First Authors in Author Co-citation Analysis
Full text linkThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Geni e popolazioni
No full textLa struttura genetica delle popolazioni cambia nel tempo, attraverso le generazioni. Le cause che provocano questi cambiamenti possono essere guidate dall’uomo, come nel caso della selezione artificiale, o essere indipendenti dall’azione umana, come per la selezione naturale, la deriva genetica o la mutazione. In questo capitolo impariamo a descrivere la struttura genetica di una popolazione, in termini di frequenze geniche, e a conoscere le forze che la modificano nel tempo. Il confronto della struttura genetica tra popolazioni ci consente di stimare la somiglianza o la diversità tra loro. La conoscenza delle frequenze geniche, tra le tante altre cose, ci permette anche di assegnare un individuo, o un campione biologico, a una determinata razza
Strategies for moving from conservation to utilisation
No full textThis chapter first introduces a general framework extending from cryoconservation to sustainable utilisation, in which in situ and ex situ techniques differ in their capacity to reach the various conservation objectives. For in situ conservation different options for maintaining self-sustaining local breeds are discussed. Some relevant aspects of ex situ conservation related to the creation of cryobanks, including selection of donor animals and the type and amount of material to be stored, are analysed as a function of the conservation objectives. In reviewing the scarce literature on costs, the chapter provides a general framework to compare costs of the different strategies for animal genetic resources management. Finally, some criteria to choose the most appropriate conservation strategy for a breed in its breeding environment are proposed
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