

{"id":56508,"date":"2019-01-11T00:00:32","date_gmt":"2019-01-11T00:00:32","guid":{"rendered":"https:\/\/www.zinpro.com\/heat-stress-performance-trace-minerals-swine-gut-health\/"},"modified":"2023-08-16T12:10:33","modified_gmt":"2023-08-16T17:10:33","slug":"heat-stress-performance-trace-minerals-swine-gut-health","status":"publish","type":"post","link":"https:\/\/www.zinpro.com\/pt\/resource-center\/blog\/heat-stress-performance-trace-minerals-swine-gut-health\/","title":{"rendered":"Estresse t\u00e9rmico, minerais tra\u00e7os de desempenho e sa\u00fade intestinal de su\u00ednos"},"content":{"rendered":"<p>O estresse por calor pode resultar em custos econ\u00f4micos significativos para a sua cria\u00e7\u00e3o de animais. Por exemplo, estima-se que o custo anual do estresse por calor no setor de su\u00ednos dos EUA seja de $900 milh\u00f5es (Pollmann, 2013). Desse valor, cerca de $450 milh\u00f5es est\u00e3o na fase de crescimento e termina\u00e7\u00e3o e cerca de $450 milh\u00f5es est\u00e3o no rebanho reprodutor.<\/p>\n\n\n\n<p>Com base nessas estimativas, n\u00e3o \u00e9 de se surpreender que os investimentos em sistemas de resfriamento nas fazendas sejam altamente predominantes. No entanto, os sistemas de resfriamento nem sempre s\u00e3o economicamente vi\u00e1veis e as falhas mec\u00e2nicas podem causar eventos de estresse t\u00e9rmico n\u00e3o planejados.<\/p>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-heat-stress-what-s-happening-inside-the-animal\">Estresse por calor: O que est\u00e1 acontecendo dentro do animal?<\/h3>\n\n\n\n<p>Quando um animal sofre estresse por calor, a temperatura corporal central aumenta, fazendo com que o fluxo sangu\u00edneo seja desviado do tecido visceral - tecido que reveste os vasos sangu\u00edneos, o est\u00f4mago, o trato digestivo e outros \u00f3rg\u00e3os internos - para a superf\u00edcie da pele para aumentar a dissipa\u00e7\u00e3o de calor. Como o fluxo sangu\u00edneo \u00e9 reduzido para o tecido visceral, isso causa uma redu\u00e7\u00e3o na quantidade de oxig\u00eanio (hip\u00f3xia) e energia dispon\u00edvel para os enter\u00f3citos (camada \u00fanica de c\u00e9lulas epiteliais) que revestem o trato intestinal. Quando isso ocorre, as jun\u00e7\u00f5es estreitas que mant\u00eam os enter\u00f3citos unidos podem enfraquecer, permitindo que os pat\u00f3genos e suas toxinas sejam transferidos para a corrente sangu\u00ednea, o que acaba levando a uma condi\u00e7\u00e3o chamada intestino perme\u00e1vel.<\/p>\n\n\n\n<p>Com o in\u00edcio do estresse por calor, sabemos que os animais geralmente apresentam uma redu\u00e7\u00e3o acentuada no consumo de ra\u00e7\u00e3o, o que tem sido apontado como um mecanismo para ajudar a reduzir o calor metab\u00f3lico. Embora seja um grande contribuinte para a perda de desempenho sob estresse por calor, essa redu\u00e7\u00e3o no consumo de ra\u00e7\u00e3o pode explicar apenas parcialmente por que os animais sob estresse por calor t\u00eam desempenho reduzido.<\/p>\n\n\n\n<p>Al\u00e9m disso, a maior taxa de respira\u00e7\u00e3o dos animais que tentam se resfriar resulta na produ\u00e7\u00e3o de radicais livres de oxig\u00eanio e nitrog\u00eanio, que podem enfraquecer ou destruir as jun\u00e7\u00f5es estreitas do intestino. O estresse t\u00e9rmico severo pode levar a altera\u00e7\u00f5es morfol\u00f3gicas no intestino, como a diminui\u00e7\u00e3o da altura das vilosidades intestinais, maior largura das vilosidades intestinais e, potencialmente, um colapso das jun\u00e7\u00f5es estreitas dos enter\u00f3citos. O intestino pode se tornar vulner\u00e1vel \u00e0 transfer\u00eancia de lipopolissacar\u00eddeos (LPS), ou endotoxinas, atrav\u00e9s da parede intestinal e para a circula\u00e7\u00e3o, causando a ativa\u00e7\u00e3o do sistema imunol\u00f3gico.<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"http:\/\/www.zinpro.com\/wp-content\/uploads\/2023\/06\/Heat-Stress2-1024x317.png\" alt=\"\" class=\"wp-image-14892\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-zinc-a-key-trace-mineral-for-tight-junctions\">Zinco: um mineral essencial para as jun\u00e7\u00f5es estreitas<\/h3>\n\n\n\n<p>V\u00e1rios estudos de pesquisa estabeleceram que a <a href=\"https:\/\/www.zinpro.com\/pt\/performance-solutions\/we-know-trace-minerals\/\" target=\"_blank\" rel=\"noopener\">tra\u00e7o mineral zinco<\/a> desempenha um papel fundamental na manuten\u00e7\u00e3o da integridade intestinal, fortalecendo as jun\u00e7\u00f5es estreitas durante os desafios. Pesquisas demonstraram que o zinco regula positivamente as prote\u00ednas da jun\u00e7\u00e3o estreita e as prote\u00ednas de choque t\u00e9rmico. Al\u00e9m disso, o zinco \u00e9 um antioxidante, e o estresse oxidativo pode desempenhar um papel fundamental no in\u00edcio do intestino perme\u00e1vel. A pesquisa tamb\u00e9m demonstrou que a forma de zinco fornecida influencia sua efic\u00e1cia na redu\u00e7\u00e3o do intestino perme\u00e1vel.<\/p>\n\n\n\n<p>A Universidade Estadual de Iowa realizou um estudo para demonstrar como as condi\u00e7\u00f5es de estresse t\u00e9rmico agudo contribuem para o intestino perme\u00e1vel. Os resultados mostraram que a alimenta\u00e7\u00e3o com minerais de tra\u00e7o de desempenho, como <a href=\"https:\/\/www.zinpro.com\/pt\/products\/availa-mins\/availa-zn\/\" target=\"_blank\" rel=\"noreferrer noopener\">Zinpro Availa<sup>\u00ae<\/sup> Zn<\/a> ajuda a diminuir a ocorr\u00eancia de intestino perme\u00e1vel, melhorando a viabilidade e a integridade do sistema intestinal.<\/p>\n\n\n\n<p>Nesse estudo, trinta e dois porcos de ra\u00e7a cruzada com peso inicial de 63 kg (140 libras) foram distribu\u00eddos aleatoriamente em um dos quatro tratamentos:<\/p>\n\n\n\n<ul class=\"wp-block-list\">\n<li><strong>Tratamento 1 (Controle termo-neutro): <\/strong>120 ppm de sulfato de zinco alimentado em condi\u00e7\u00f5es termo-neutras (21\u00b0C; umidade 70%); <em>ad libitum<\/em> consumo de ra\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Tratamento 2 (Controle termo-neutro com restri\u00e7\u00e3o de nutrientes): <\/strong>120 ppm de sulfato de zinco alimentado em condi\u00e7\u00f5es termo-neutras (21\u00b0C; 70% de umidade); ingest\u00e3o restrita de ra\u00e7\u00e3o. Os animais nesse tratamento puderam consumir a mesma quantidade de ra\u00e7\u00e3o que as duas dietas de estresse por calor (tratamentos 3 e 4, 17% de <em>ad libitum<\/em> consumo de ra\u00e7\u00e3o); isso permite compara\u00e7\u00f5es em um ambiente controlado.<\/li>\n\n\n\n<li><strong>Tratamento 3 (Controle de estresse t\u00e9rmico): <\/strong>120 ppm de sulfato de zinco alimentados em condi\u00e7\u00f5es de estresse t\u00e9rmico agudo (37\u00b0C, 40% de umidade); <em>ad libitum<\/em> consumo de ra\u00e7\u00e3o.<\/li>\n\n\n\n<li><strong>Tratamento 4 (Heat Stress Availa Zn): <\/strong>120 ppm de zinco total suplementado (60 ppm de zinco do Availa Zn e 60 ppm de sulfato de zinco) em condi\u00e7\u00f5es de estresse t\u00e9rmico agudo (37\u00b0C; 40% de umidade); <em>ad libitum <\/em>consumo de ra\u00e7\u00e3o.<\/li>\n<\/ul>\n\n\n\n<p>Como esperado, submeter os su\u00ednos a condi\u00e7\u00f5es de estresse t\u00e9rmico agudo resultou em aumento da temperatura retal, aumento das taxas de respira\u00e7\u00e3o e redu\u00e7\u00e3o do consumo de ra\u00e7\u00e3o. No entanto, a pesquisa tamb\u00e9m esclarece o que est\u00e1 acontecendo dentro dos porcos durante um desafio agudo de estresse por calor.<\/p>\n\n\n\n<p>Os pesquisadores mediram a permeabilidade ileal - a terceira e \u00faltima parte do intestino delgado - dos su\u00ednos colhidos. Os su\u00ednos nas condi\u00e7\u00f5es de estresse t\u00e9rmico do Tratamento 3 e nas condi\u00e7\u00f5es t\u00e9rmicas neutras do Tratamento 2, alimentados em pares, apresentaram maior permeabilidade intestinal em compara\u00e7\u00e3o com os su\u00ednos nas condi\u00e7\u00f5es t\u00e9rmicas neutras do Tratamento 1. Esse achado indica que um evento de estresse t\u00e9rmico, ou mesmo um per\u00edodo em que os animais est\u00e3o sob restri\u00e7\u00e3o de ingest\u00e3o de ra\u00e7\u00e3o, como eventos de falta de ra\u00e7\u00e3o (tratamento 2 com alimenta\u00e7\u00e3o em pares), aumenta o risco de permeabilidade intestinal (intestino perme\u00e1vel).<\/p>\n\n\n\n<p>Quando os su\u00ednos foram submetidos a condi\u00e7\u00f5es de estresse t\u00e9rmico agudo, a alimenta\u00e7\u00e3o com Availa Zn ajudou a diminuir o vazamento intestinal em compara\u00e7\u00e3o com a alimenta\u00e7\u00e3o com sulfato de zinco inorg\u00e2nico. Os porcos alimentados com Availa Zn conseguiram montar uma resposta imunol\u00f3gica mais eficaz. Entre os su\u00ednos estressados pelo calor, os que receberam Availa Zn expressaram concentra\u00e7\u00f5es maiores de prote\u00edna de liga\u00e7\u00e3o ao lipopolissacar\u00eddeo (LPS) no plasma em compara\u00e7\u00e3o com os que receberam sulfato de zinco. Como uma prote\u00edna de fase aguda, a prote\u00edna de liga\u00e7\u00e3o ao LPS sequestra o LPS bacteriano para que ele possa ser destru\u00eddo por outros componentes imunol\u00f3gicos. Nos tratamentos de estresse t\u00e9rmico, os su\u00ednos alimentados com Availa Zn (Tratamento 4) apresentaram n\u00edveis de endotoxina s\u00e9rica numericamente mais baixos em compara\u00e7\u00e3o com os su\u00ednos alimentados com sulfato de zinco (Tratamento 3).<\/p>\n\n\n\n<figure class=\"wp-block-image size-large\"><img decoding=\"async\" src=\"http:\/\/www.zinpro.com\/wp-content\/uploads\/2023\/06\/Heat-Stress-1-1024x665.png\" alt=\"\" class=\"wp-image-14895\"\/><\/figure>\n\n\n\n<h3 class=\"wp-block-heading\" id=\"h-heat-stress-and-performance-trace-minerals-bringing-it-all-together\">Estresse t\u00e9rmico e minerais tra\u00e7os de desempenho: Juntando tudo<\/h3>\n\n\n\n<p>O estresse por calor \u00e9 um problema generalizado que os produtores de su\u00ednos precisam gerenciar. \u00c9 fundamental ter um plano em vigor antes do in\u00edcio das condi\u00e7\u00f5es clim\u00e1ticas quentes para evitar os efeitos de longo prazo que o estresse por calor pode ter sobre o desempenho dos animais. Ao incorporar oligoelementos de desempenho, como o Availa Zn, nas dietas dos su\u00ednos, os animais t\u00eam mais condi\u00e7\u00f5es de reduzir o impacto do intestino perme\u00e1vel durante as condi\u00e7\u00f5es de estresse por calor.<\/p>\n\n\n\n<p>Pesquisas demonstram que a fonte de zinco fornecida nas dietas de su\u00ednos \u00e9 fundamental para atenuar o estresse por calor. <a href=\"https:\/\/www.zinpro.com\/pt\/products\/availa-mins\/availa-zn\/\" target=\"_blank\" rel=\"noreferrer noopener\">Entre em contato com seu representante Zinpro<\/a> para saber mais sobre os benef\u00edcios da alimenta\u00e7\u00e3o <a href=\"https:\/\/www.zinpro.com\/pt\/products\/availa-mins\/availa-zn\/\" target=\"_blank\" rel=\"noreferrer noopener\">Zn dispon\u00edvel<\/a> em dietas de su\u00ednos para ajudar a controlar o estresse t\u00e9rmico e a inflama\u00e7\u00e3o.<\/p>","protected":false},"excerpt":{"rendered":"<p>Os sistemas de resfriamento s\u00e3o importantes para ajudar a combater o impacto do estresse t\u00e9rmico no rebanho su\u00edno. Saiba como as estrat\u00e9gias nutricionais, incluindo a alimenta\u00e7\u00e3o com minerais de desempenho, como o Availa<sup>\u00ae<\/sup>O Zn tamb\u00e9m pode ajudar a atenuar os efeitos do estresse t\u00e9rmico e de uma condi\u00e7\u00e3o chamada intestino perme\u00e1vel.<\/p>","protected":false},"author":48,"featured_media":56511,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_acf_changed":false,"_tec_requires_first_save":true,"_eb_attr":"","_uag_custom_page_level_css":"","_EventAllDay":false,"_EventTimezone":"","_EventStartDate":"","_EventEndDate":"","_EventStartDateUTC":"","_EventEndDateUTC":"","_EventShowMap":false,"_EventShowMapLink":false,"_EventURL":"","_EventCost":"","_EventCostDescription":"","_EventCurrencySymbol":"","_EventCurrencyCode":"","_EventCurrencyPosition":"","_EventDateTimeSeparator":"","_EventTimeRangeSeparator":"","_EventOrganizerID":[],"_EventVenueID":[],"_OrganizerEmail":"","_OrganizerPhone":"","_OrganizerWebsite":"","_VenueAddress":"","_VenueCity":"","_VenueCountry":"","_VenueProvince":"","_VenueState":"","_VenueZip":"","_VenuePhone":"","_VenueURL":"","_VenueStateProvince":"","_VenueLat":"","_VenueLng":"","_VenueShowMap":false,"_VenueShowMapLink":false,"_tribe_blocks_recurrence_rules":"","_tribe_blocks_recurrence_description":"","_tribe_blocks_recurrence_exclusions":"","_ecp_custom_2":"","footnotes":""},"categories":[2682],"tags":[2693,2683,2684,2689,2685,2686],"species":[943],"class_list":["post-56508","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-blog","tag-animal-husbandry","tag-animal-performance","tag-health","tag-heat-stress","tag-immunity","tag-inflammation"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v27.4 (Yoast SEO v27.4) - https:\/\/yoast.com\/product\/yoast-seo-premium-wordpress\/ -->\n<title>Heat Stress, Performance Trace Minerals &amp; Swine Gut Health &#8211; Zinpro\u00ae<\/title>\n<meta name=\"description\" content=\"Blog posts from Zinpro\u00ae about Heat Stress, Performance Trace Minerals &amp; Swine Gut Health . 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