Ciencias Agropecuarias

URI permanente para esta comunidadhttp://repositorio.uta.edu.ec/handle/123456789/870

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2016 - 20202

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Tipo de acceso: Acceso abiertoTema: search.filters.subject.CARNEROS CRIOLLOS

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  • Miniatura
    Item type:Ítem,
    Efecto de la GnRH sintética sobre la calidad del semen criopreservado diluido con dos productos comerciales, de carneros criollos alimentados con Medicago sativa contaminada
    (2020-09)
    Arias Vallejos, Ana Fernanda
    ;
    Aragadvay Yungán, Gonzalo
    The purpose of the present investigation was to evaluate the effect of synthetic GnRH on the quality of cryopreserved semen in 0.5 ml straws, diluted with commercial products, raw meat fed with 70% of Medicago sativa contaminated with Pseudopezisa medicaginis. The treatments are distributed according to the following: G0D1: only semen diluted with Triladyl obtained from types that do not receive GnRH; G0D2: Semen diluted with Andromed from sheep that did not receive GnRH; G1D1: twodose GnRH-treated cartridges diluted with Triladyl; G1D2: semen from animals treated with GnRH at two doses diluted with Andromed; G2D1: Semen from animals treated with GnRH in alternative doses diluted with Triladyl; G2D2: Semen from animals treated with GnRH in alternative doses diluted with Andromed. It works with 36 experimental units with different commercial diluents. Starting to evaluate 108 sheep straws in total. The work will be carried out through a completely random design in a 3 * 2 factorial arrangement with 6 repetitions. Statistical analyzes were carried out using a variance analysis and a comparison of the average treatment with a 5% Tukey test using the statistical program. The following variables were analyzed: mass motility (MMSL), individual progressive motility (MIP), osmotic resistance (HOST), sperm morphology (MRF), sperm concentration (CONC) and acrosome integrity. The variables that showed differences between treatments: massive motility (MMSL), progressive individual motility (MIP), acrosomatic integrity and osmotic resistance (HOST). The general conclusion is that GnRH positively influences the semen quality of sheep after defrosting
  • Miniatura
    Item type:Ítem,
    Efecto de la alfalfa contaminada con Pseudopeziza medicaginis sobre la calidad del semen de carneros criollos
    (2016)
    Novillo Rueda, María Rubí
    ;
    Aragadvay Yungán, Gonzalo
    This work was done on the farm of the Técnica de Ambato University. Grazing meadows formed mostly by alfalfa is used in the Ecuadorian highlands in feeding sheep, however this forage has high severity Pseudopezisa medicaginis related turn with high levels of phytoestrogens (coumestrol). The aim of this research was to assess the effects on semen quality, the coumestrol present in contaminated alfalfa with different levels of Pseudopezisa medicaginis included in diets for sheep. They were tested in a isoproteic and isoenergetic diet, three different levels of fungal contamination, evaluated the following treatments: T1 10%, T2: 40%, T3: 70% contamination in alfalfa. The experiment was carried out under a design of a randomized complete block. By artificial vagina weekly semen collections were performed for evaluation of volume (VOL), motility (MOT), mortality (MOR), concentration (CONC), morphology (MRF), gross motility (SLMM), and individual mobility (MIDL) . The MOR VOL and showed no difference (P = 0.4856 and P = 0.5952 respectively) between treatments. CONC sperm (P = 0.0117) showed no difference, with a higher concentration T1 (Sp 4.63 x 109) with respect to T2 and T3. With regard to the MRF sperm it showed difference (P = 0.0016) between treatments found lower percentages of morphological changes in animals that were fed contaminated alfalfa with 10% Pseudopeziza medicaginis (T1). As for MMSL differences (P = 0.0001) it was observed between treatments, with the greatest mobility T1 (4.43). The higher (P = 0.0007) MIDL is observed for the T1 and T2 T3 off. It is concluded that ingestion of alfalfa with 70% contamination with Pseudopeziza medicaginis measurements have harmful effects on sperm morphology especially alterations in the queue and as low result in both individual sperm motility as masal, which could become these results detrimental effects on reproductive perfomance.