{"id":55177,"date":"2018-03-09T22:42:55","date_gmt":"2018-03-09T22:42:55","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/prolificacy-reproductive-longevity-and-body-reserves-in-female-rabbits-examined-using-selection-lines\/"},"modified":"2018-03-09T22:42:55","modified_gmt":"2018-03-09T22:42:55","slug":"prolificacy-reproductive-longevity-and-body-reserves-in-female-rabbits-examined-using-selection-lines","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/seleccion-animal\/prolificacy-reproductive-longevity-and-body-reserves-in-female-rabbits-examined-using-selection-lines\/","title":{"rendered":"Prolificacy, reproductive longevity and body reserves in female rabbits examined using selection lines"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Per Theilgaard <\/strong><\/h2>\n<p>El objetivo general de esta tesis  fue el estudio de la relaci\u00f3n entre longevidad reproductiva, rendimiento reproductivo y reservas corporales en conejas, as\u00ed como el cambio de estas relaciones con la selecci\u00f3n. El efecto de la selecci\u00f3n se estudi\u00f3 utilizando l\u00edneas seleccionadas. Se  ha revisado la evidencia actual de los antagonismos entre reproducci\u00f3n, producci\u00f3n y longevidad y se presenta un marco de relaci\u00f3n entre condici\u00f3n corporal, reproducci\u00f3n y longevidad. en el primer trabajo se investiga el efecto de las reservas corporales y de la selecci\u00f3n por tama\u00f1o de camada sobre la longevidad reproductiva. Se comparan, utilizando embriones congelados, conejas cruzadas separadas 12 generaciones en el proceso de selecci\u00f3n de las dos l\u00edneas maternales que intervienen en su producci\u00f3n. La condici\u00f3n corporal de las conejas se evaluaba  a trav\u00e9s del espesor de la grasa peri-renal  medida por ultrasonidos el d\u00eda 10 de lactaci\u00f3n durante los seis primeros partos. Se utiliz\u00f3 un modelo cox de riesgos proporcionales para estimar las caracter\u00edsticas de supervivencia. Se encontr\u00f3 que la duraci\u00f3n de la vida productiva no se hab\u00eda modificado despu\u00e9s de doce generaciones de selecci\u00f3n por tama\u00f1o de camada al destete. Los animales con menor espesor de grasa peri-renal mostraban un mayor riesgo de eliminaci\u00f3n que las conejas con mejor condici\u00f3n corporal. Las conejas que ten\u00edan una movilizaci\u00f3n de reservas extremadamente alta presentaban riesgos mayores que las de movilizaci\u00f3n intermedia. el segundo y tercer trabajo analizan la predicci\u00f3n, derivada de las teor\u00edas evolutivas de los antagonismos, de que las l\u00edneas con alta capacidad reproductiva al inicio tendr\u00e1n una capacidad reproductiva inferior en fases posteriores. Asumiendo que la capacidad reproductiva pueda medirse por el tama\u00f1o de camada, la predicci\u00f3n anterior se prob\u00f3 comparando la l\u00ednea v, seleccionada por tama\u00f1o de camada al destete durante 31 generaciones, y la l\u00ednea lp, seleccion<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>Prolificacy, reproductive longevity and body reserves in female rabbits examined using selection lines<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 Prolificacy, reproductive longevity and body reserves in female rabbits examined using selection lines <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Per Theilgaard <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Polit\u00e9cnica de Valencia<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 26\/10\/2006<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<h3>Direcci\u00f3n y tribunal<\/h3>\n<ul>\n<li><strong>Director de la tesis<\/strong>\n<ul>\n<li>Manuel Baselga Izquierdo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal: julio Fern\u00e1ndez carmona <\/li>\n<li>gerolamo Xiccato (vocal)<\/li>\n<li>peer Berg (vocal)<\/li>\n<li>Miguel angel Silvestre camps (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Per Theilgaard El objetivo general de esta tesis fue el estudio de la relaci\u00f3n entre longevidad reproductiva, [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"site-sidebar-layout":"default","site-content-layout":"","ast-site-content-layout":"","site-content-style":"default","site-sidebar-style":"default","ast-global-header-display":"","ast-banner-title-visibility":"","ast-main-header-display":"","ast-hfb-above-header-display":"","ast-hfb-below-header-display":"","ast-hfb-mobile-header-display":"","site-post-title":"","ast-breadcrumbs-content":"","ast-featured-img":"","footer-sml-layout":"","theme-transparent-header-meta":"","adv-header-id-meta":"","stick-header-meta":"","header-above-stick-meta":"","header-main-stick-meta":"","header-below-stick-meta":"","astra-migrate-meta-layouts":"default","ast-page-background-enabled":"default","ast-page-background-meta":{"desktop":{"background-color":"var(--ast-global-color-4)","background-image":"","background-repeat":"repeat","background-position":"center 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