Browsing by Autor "Vincenzo Landi"

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    GENETIC CHARACTERIZATION OF SOUTH AMERICA DOMESTIC GUINEA PIG USING MOLECULAR MARKERS
    (Autonomous University of Yucatán, 2018) Diana Avilés-Esquivel; Amparo Maria Martínez; Vincenzo Landi; Luz A Álvarez; Angelica Stemmer; Nílton C. Gómez-Urviola; Juan Vicente Delgado Bermejo
    <p>Twenty specific primers were used to define the genetic diversity and structure of the domestic guinea pig (<em>Cavia porcellus</em>). The samples were collected from the Andean countries (Colombia, Ecuador, Peru and Bolivia). In addition, samples from Spain were used as an out-group for topological trees. The microsatellite markers were used and showed a high polymorphic content (PIC) 0.750, and heterozygosity values indicated microsatellites are highly informative. The genetic variability in populations of guinea pigs from Andean countries was (He: 0.791; Ho: 0.710), the average number of alleles was high (8.67). A deficit of heterozygotes (<em>F<sub>IS</sub></em>: 0.153; p<0.05) was detected. Through the analysis of molecular variance (AMOVA) no significant differences were found among the guinea pigs of the Andean countries (F<em><sub>ST</sub></em>: 2.9%); however a genetic differentiation of 16.67% between South American populations and the population from Spain was detected. A poor genetic structure was found among the Andean countries with high genetic variability. The results suggest that it is necessary to take urgent measures to prevent further genetic erosion of native guinea pigs in the Andean countries with plans for recovery and conservation of this important genetic resource in South America.</p>
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    Goat genetic and phenotypic variation of body measurement traits in a sample of the Venezuelan creole goat population
    (Asociación Latinoamericana de Producción Animal, 2023) Fidel Pariacote; Dalila C. D’Ascencao; Leyberth Elena Ruiz Cuba; Quiterio Nuñez Miranda; W. Morón; X. Pimentel; Emerita Abreu Garcia; Darwin R. Lugo Sira; Vincenzo Landi
    Variation within a given population is due basically to environmental and genetic deviations among the individuals. Genetic deviations are heritable and therefore the base for selection. In animal production, reproduction of outstanding individuals is allowed in a higher degree to improve forthcoming generations. The genetic variation is a property of genes influencing the traits and genes frequency may change among populations, basically due to genetic drift and animal husbandry. Phenotypic and genetic variation of morphological quantitative traits was estimated in the Venezuelan Creole goat population. The additive direct genetic variation or heritable fraction out of the total phenotypic variance found in this study is indicative that most traits evaluated can be improved through selection which should be taken into consideration in any breeding program.