{"id":138955,"date":"2026-01-12T17:39:54","date_gmt":"2026-01-12T17:39:54","guid":{"rendered":"https:\/\/www.deberes.net\/tesis\/sin-categoria\/la-excrecion-de-catabolitos-en-la-orina-de-la-oveja-en-relacion-con-las-variaciones-dieteticas-en-los-aportes-de-energia-y-nitrogeno\/"},"modified":"2026-01-12T17:39:54","modified_gmt":"2026-01-12T17:39:54","slug":"la-excrecion-de-catabolitos-en-la-orina-de-la-oveja-en-relacion-con-las-variaciones-dieteticas-en-los-aportes-de-energia-y-nitrogeno","status":"publish","type":"post","link":"https:\/\/www.deberes.net\/tesis\/ciencias-agrarias\/la-excrecion-de-catabolitos-en-la-orina-de-la-oveja-en-relacion-con-las-variaciones-dieteticas-en-los-aportes-de-energia-y-nitrogeno\/","title":{"rendered":"La excrecion de catabolitos en la orina de la oveja en relacion con las variaciones dieteticas en los aportes de energia y nitrogeno"},"content":{"rendered":"<h2>Tesis doctoral de <strong> Francisco Javier Gir\u00e1ldez Garc\u00eda <\/strong><\/h2>\n<p>Bases bioquimicas y fisiologicas justifican la existencia de relaciones entre la excrecion urinaria de ciertos catabolitos y los procesos de digestion, absorcion y metabolismo de los nutrientes. Partiendo de esta base, el objetivo del presente trabajo fue estudiar la posibilidad de emplear el perfil de excrecion urinaria como base para predecir los aportes dieteticos de energia y nitrogeno en el ganado ovino. Para ello se utilizaron 75 ovejas adultas de raza churra distribuidas al azar en 25 grupos de 3 animales cada uno de acuerdo con un dise\u00f1o factorial 5&#215;5, combinando 5 niveles de ingestion de energia metabolizable (em) y 5 de proteina degradable en el rumen (pdr) y se estudio la excrecion urinaria de creatinina, urea, amoniaco, derivados puricos (alantoina, hipoxantina, xantina y acido urico) y acidos aromaticos benzoico, hipurico, fenilacetico y fenaceturico. Se llevaron a cabo, por tanto, un total de 25 tratamientos experimentales, empleando para cada uno de ellos una dieta experimental cuya formulacion exigio la realizacion de pruebas de digestibilidad in vitro e in sacco.  la excrecion de creatinina fue independiente de los aportes dieteticos de em y\/o pdr, observandose un valor medio de 74 mg\/kg pvo.75\/dia. La excrecion de urea estuvo relacionada con la ingestion de pdr (r=0,78, p&lt;0,01), si bien esta relacion fue distinta para los diferentes niveles de ingestion de em. La alantoina explico la mayor parte de la variacion observada en el total de derivados puricos eliminados en la orina(r2=93%). Por otra parte, la excrecion de alantoina se vio afectada por la ingestion de pdr cuando esta constituyo un factor limitante de la sintesis microbiana, observandose un coeficiente de correlacion estadisticamente significativo entre ambas variables en el nivel mas elevado de ingestion de em (r=0,58). En lo que respecta a los acidos aromaticos cabe indicar en primer lugar que mientras el acido benzoico se excreto en su mayor parte<\/p>\n<p>&nbsp;<\/p>\n<h3>Datos acad\u00e9micos de la tesis doctoral \u00ab<strong>La excrecion de catabolitos en la orina de la oveja en relacion con las variaciones dieteticas en los aportes de energia y nitrogeno<\/strong>\u00ab<\/h3>\n<ul>\n<li><strong>T\u00edtulo de la tesis:<\/strong>\u00a0 La excrecion de catabolitos en la orina de la oveja en relacion con las variaciones dieteticas en los aportes de energia y nitrogeno <\/li>\n<li><strong>Autor:<\/strong>\u00a0 Francisco Javier Gir\u00e1ldez Garc\u00eda <\/li>\n<li><strong>Universidad:<\/strong>\u00a0 Le\u00f3n<\/li>\n<li><strong>Fecha de lectura de la tesis:<\/strong>\u00a0 01\/01\/1992<\/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>Eduardo Zorita Tomillo<\/li>\n<\/ul>\n<\/li>\n<li><strong>Tribunal<\/strong>\n<ul>\n<li>Presidente del tribunal:  Guada Vallepuga Jos\u00e9 Antonio <\/li>\n<li>\u00e1ngel Ruiz Mantec\u00f3n (vocal)<\/li>\n<li>Rafael Sanz Arias (vocal)<\/li>\n<li>Joaquim Barcells Teres (vocal)<\/li>\n<\/ul>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Tesis doctoral de Francisco Javier Gir\u00e1ldez Garc\u00eda Bases bioquimicas y fisiologicas justifican la existencia de relaciones entre la excrecion urinaria [&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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