{"id":1736,"date":"2021-05-12T18:52:22","date_gmt":"2021-05-12T18:52:22","guid":{"rendered":"https:\/estres-per-calor-i-acidosi-en-vaques-de-llet\/"},"modified":"2025-09-01T16:33:58","modified_gmt":"2025-09-01T16:33:58","slug":"estres-per-calor-i-acidosi-en-vaques-de-llet","status":"publish","type":"post","link":"https:\/\/tech-complex.com\/ca\/estres-per-calor-i-acidosi-en-vaques-de-llet\/","title":{"rendered":"Estr\u00e8s per calor i acidosi en vaques de llet"},"content":{"rendered":"<div data-breakout=\"normal\">\n<p id=\"viewer-foo\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">L&#8217;estr\u00e8s t\u00e8rmic passa quan un animal \u00e9s incapa\u00e7 d&#8217;eliminar l&#8217;exc\u00e9s de calor corporal de manera natural. Sota aquestes condicions s&#8217;incrementa el risc d&#8217;acidosi. <\/span><\/p>\n<\/div>\n<div data-breakout=\"normal\">\n<h2 id=\"viewer-9ek9k\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><span class=\"vsfWl\"><strong>Freq\u00fc\u00e8ncia de situacions de risc d\u2019acidosi ruminal<\/strong><\/span><\/h2>\n<p class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\" style=\"text-align: justify;\"><span class=\"vsfWl\"><strong><br \/>\n<\/strong><\/span>L\u2019acumulaci\u00f3 de calor \u00e9s causada per les temperatures exteriors i l\u2019alta humitat relativa que excedeixen la capacitat fisiol\u00f2gica de termoregulaci\u00f3 en els mam\u00edfers, m\u00e9s coneguda com a evapotranspiraci\u00f3.<\/p>\n<\/div>\n<div data-breakout=\"normal\">\n<p id=\"viewer-clkor\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\" style=\"text-align: justify;\"><span class=\"vsfWl MqvCC\">Aquesta relaci\u00f3 de temperatura-humitat relativa s&#8217;expressa mitjan\u00e7ant l&#8217;\u00edndex THI, que descriu els nivells d&#8217;estr\u00e8s per calor. A causa del seu alt funcionament metab\u00f2lic, les vaques lleteres estan m\u00e9s subjectes a l&#8217;estr\u00e8s per calor que els humans, per exemple. L&#8217;estr\u00e8s per calor es considera moderat quan l&#8217;\u00edndex THI supera els 72 per a les vaques lleteres, mentre que seria superior a 80 per als humans. La temperatura de confort per a una vaca lletera est\u00e0 entre 0 i 20 \u00b0C. Una temperatura de 25 \u00b0C amb una humitat relativa del 50 % correspon a un \u00edndex de 72. Les vaques lleteres s\u00f3n, per tant, molt sensibles, la qual cosa requereix una vigil\u00e0ncia m\u00e9s gran respecte al risc d&#8217;acidosi. El ramader no pot confiar en la seva percepci\u00f3 per avaluar el confort t\u00e8rmic dels animals.      <\/span><\/p>\n<\/div>\n<div data-hook=\"rcv-block7\"><\/div>\n<h2 data-hook=\"rcv-block7\"><strong>Conseq\u00fc\u00e8ncies de l&#8217;estr\u00e8s per calor al ramat<\/strong><\/h2>\n<div data-hook=\"rcv-block7\"><\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block8\">S&#8217;estimen unes p\u00e8rdues de 120\u20ac per vaca degudes a l&#8217;estr\u00e8s cal\u00f2ric.<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-3do1\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">Tot i aix\u00f2, les p\u00e8rdues econ\u00f2miques vinculades a l&#8217;estr\u00e8s per calor s\u00f3n dif\u00edcils de calcular. Les troballes d&#8217;un estudi realitzat en vaques americanes van mostrar que fins i tot si es prenguessin mesures preventives contra l&#8217;estr\u00e8s per calor, les p\u00e8rdues encara ronden els 120 \u20ac\/vaca\/any amb un 80 % d&#8217;aquestes p\u00e8rdues a la producci\u00f3 i un 20 % a l&#8217;augment de despeses vinculades a la salut de l&#8217;animal (no nom\u00e9s per acidosis). <\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block11\"><\/div>\n<h2 data-hook=\"rcv-block11\"><strong>Efectes negatius sobre la producci\u00f3 de llet<\/strong><\/h2>\n<div data-hook=\"rcv-block11\"><\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block12\">L&#8217;estr\u00e8s per calor redueix la producci\u00f3 de llet i els seus components (menor contingut de greix) i tamb\u00e9 t\u00e9 un impacte negatiu en la reproducci\u00f3 i la immunitat. Tamb\u00e9 hem demostrat que l&#8217;estr\u00e8s per calor durant la gestaci\u00f3 t\u00e9 un efecte negatiu sobre la lact\u00e0ncia i conseq\u00fcentment sobre la productivitat. <\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-2km3k\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">Per\u00f2 tamb\u00e9 sobre el funcionament metab\u00f2lic que agreuja el risc d&#8217;acidosi.<\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-6v9li\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">La resposta de superviv\u00e8ncia d\u201funa vaca lletera que s\u201fenfronta al\u201festr\u00e8s per calor \u00e9s una menor ingesta de mat\u00e8ria seca. De fet, la fermentaci\u00f3 al rumen indueix una reacci\u00f3 exot\u00e8rmica. Per tant, aquest augment de calor ruminal s&#8217;ha d&#8217;eliminar, juntament amb la termoregulaci\u00f3 indu\u00efda per les altes temperatures exteriors. Hi ha una correlaci\u00f3 positiva entre un augment de la temperatura ruminal (manca de termoregulaci\u00f3) i un risc m\u00e9s gran d&#8217;acidosi.   <\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-3o955\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">Les causes de l&#8217;acidosi ruminal durant l&#8217;estr\u00e8s per calor s\u00f3n les seg\u00fcents:<\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<ul class=\"QOI7n rIsue\">\n<li class=\"B229E\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-263gv\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\"><span class=\"vsfWl MqvCC\">Disminuci\u00f3 de la quantitat de mat\u00e8ria org\u00e0nica digerida<\/span><\/p>\n<\/li>\n<li class=\"B229E\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-c6dtj\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\"><span class=\"vsfWl MqvCC\">Reducci\u00f3 de la producci\u00f3 de saliva rica en subst\u00e0ncies tamp\u00f3 (estimulaci\u00f3 durant la masticaci\u00f3)<\/span><\/p>\n<\/li>\n<li class=\"B229E\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-1t3r1\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\"><span class=\"vsfWl MqvCC\">Disminuci\u00f3 de la quantitat de bicarbonat de sodi disponible a la sang a causa d&#8217;un increment en la freq\u00fc\u00e8ncia respirat\u00f2ria.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-9i4qq\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">A m\u00e9s, hi ha un desequilibri en la flora ruminal en detriment de la flora cel\u00b7lulol\u00edtica. L&#8217;efici\u00e8ncia aliment\u00e0ria tamb\u00e9 es veu afectada. Per tant, l&#8217;estr\u00e8s per calor indueix les mateixes patologies que l&#8217;acidosi cl\u00ednica o subcl\u00ednica cr\u00f2nica:  <\/span><\/p>\n<\/div>\n<div data-breakout=\"normal\">\n<ul class=\"QOI7n rIsue\">\n<li class=\"B229E\" dir=\"auto\" style=\"text-align: justify;\" aria-level=\"1\">\n<p id=\"viewer-bt01l\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\"><span class=\"vsfWl MqvCC\">Es compromet l\u00b4estat de salut general de la vaca<\/span><\/p>\n<\/li>\n<li class=\"B229E\" dir=\"auto\" style=\"text-align: justify;\" aria-level=\"1\">\n<p id=\"viewer-3q884\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\"><span class=\"vsfWl MqvCC\">Coixeres<\/span><\/p>\n<\/li>\n<li class=\"B229E\" dir=\"auto\" style=\"text-align: justify;\" aria-level=\"1\">\n<p id=\"viewer-cf55e\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\"><span class=\"vsfWl MqvCC\">Problemes de fertilitat<\/span><\/p>\n<\/li>\n<li class=\"B229E\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-c2oh\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"\" style=\"text-align: justify;\"><span class=\"vsfWl MqvCC\">Augment de la taxa de sacrifici<\/span><\/p>\n<\/li>\n<\/ul>\n<p>&nbsp;<\/p>\n<\/div>\n<div data-breakout=\"normal\">\n<h2 id=\"viewer-5p5cn\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><span class=\"vsfWl\">Prevenir el risc d&#8217;acidosi mitjan\u00e7ant una gesti\u00f3 millor del ramat<\/span><\/h2>\n<\/div>\n<div data-breakout=\"normal\">\n<div id=\"viewer-5lg9r\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\" style=\"text-align: justify;\"><u>Adaptaci\u00f3 de les instal\u00b7lacions<\/u><\/div>\n<div dir=\"auto\" style=\"text-align: justify;\"><\/div>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block25\">Equips com ventiladors o sistemes de nebulitzaci\u00f3 s&#8217;utilitzen sistem\u00e0ticament a les granges lleteres que s&#8217;enfronten a l&#8217;estr\u00e8s per calor de forma recurrent. Avui dia, els ramaders estan familiaritzats amb aquest tipus dequips i tamb\u00e9 poden jugar amb altres estrat\u00e8gies. Per\u00f2 necessiten engegar aquestes eines quan els animals les necessiten i no nom\u00e9s quan ells tamb\u00e9 comencen a patir estr\u00e8s per calor.  <\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block26\"><\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<div id=\"viewer-fdm04\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><u>Adaptaci\u00f3 de la gesti\u00f3<\/u><\/div>\n<div dir=\"auto\"><\/div>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block28\">Modificar el moment d&#8217;alimentaci\u00f3 de les racions, monitoritzar els punts d&#8217;aigua de beguda o proporcionar una raci\u00f3 m\u00e9s fibrosa s\u00f3n m\u00e8todes utilitzats comunament. Malauradament, no n&#8217;hi ha prou per preservar la producci\u00f3 potencial de llet a causa del doble impacte del rumen: d&#8217;una banda, una menor ingesta de mat\u00e8ria seca i, de l&#8217;altra, una menor efici\u00e8ncia aliment\u00e0ria. <\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block29\"><\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<div id=\"viewer-bp0c3\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><u>Refor\u00e7ar el comportament natural i la ingesta d&#8217;aliments<\/u><\/div>\n<div dir=\"auto\"><\/div>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block32\">Una combinaci\u00f3 de 2 solucions en prova de camp<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block34\">Un estudi va provar la combinaci\u00f3 de dues solucions sensorials incorporades a l&#8217;alimentaci\u00f3 de vaques lleteres sotmeses a un per\u00edode d&#8217;estr\u00e8s per calor:<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<ul class=\"QOI7n rIsue\">\n<li class=\"B229E\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-9ilkn\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"\"><span class=\"vsfWl\">La primera soluci\u00f3 basada en un extracte natural de la fam\u00edlia Rutaceae actua sobre la modulaci\u00f3 del missatge d&#8217;estr\u00e8s al cervell.<\/span><\/p>\n<\/li>\n<li class=\"B229E\" dir=\"auto\" aria-level=\"1\">\n<p id=\"viewer-clp4l\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"\"><span class=\"vsfWl\">La segona soluci\u00f3, una barreja espec\u00edfica d&#8217;olis essencials i d&#8217;esp\u00e8cies, actua sobre el sistema digestiu de l&#8217;animal.<\/span><\/p>\n<\/li>\n<\/ul>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block36\">Aquesta prova de camp va tenir lloc a Portugal amb 296 vaques a lactaci\u00f3.<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-77rrr\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">Es van formar dos lots d&#8217;animals segons els nivells i etapes de lact\u00e0ncia: vaques prim\u00edpares a la meitat de la lactaci\u00f3 i vaques mult\u00edpares en la lact\u00e0ncia primerenca. Es va registrar la producci\u00f3 di\u00e0ria de llet, el consum d&#8217;aliment, el nombre d&#8217;animals i l&#8217;etapa de lact\u00e0ncia. Durant el per\u00edode de prova, la temperatura mitjana a les 5:00 va ser de 17 \u00b0C i la temperatura mitjana a les 3:00 era de 32 \u00b0C. Les temperatures mitjanes durant aquesta prova van ser m\u00e9s altes durant el per\u00edode de suplementaci\u00f3 que les dels controls. Abans de la suplementaci\u00f3, les vaques consumien una mitjana de 22,7 kg de mat\u00e8ria seca.    <\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block40\"><\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-5e7i\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><span class=\"vsfWl\"><u>Resultats de comportament<\/u><\/span><\/p>\n<p class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><span class=\"vsfWl\"><u><br \/>\n<\/u><\/span>Es van observar canvis en el comportament d\u2019alimentaci\u00f3 durant el per\u00edode de suplementaci\u00f3. Les vaques van consumir m\u00e9s al mat\u00ed quan la temperatura a les 5:00 a.m. era m\u00e9s alta. L\u2019efecte de la primera alternativa es manifesta per la regulaci\u00f3 del consum d\u2019aliment segons les condicions ambientals en temps real. En aquesta prova, les vaques van anticipar les temperatures m\u00e0ximes de la tarda, especialment quan les temperatures del mat\u00ed eren altes, ajustant les seves dietes en conseq\u00fc\u00e8ncia. Aix\u00ed, les fermentacions exot\u00e8rmiques es van produir principalment en moments en qu\u00e8 la temperatura exterior encara era suportable.    <\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-ea53f\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">D&#8217;altra banda, la suplementaci\u00f3 no va tenir cap efecte en el consum de racions de la tarda perqu\u00e8 les temperatures ja eren massa altes perqu\u00e8 la vaca s&#8217;arrisqu\u00e9s a elevar encara m\u00e9s la temperatura corporal i conduir a un risc d&#8217;acidosi.<\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-4ja9h\" class=\"Is4xI aaZkV MqvCC QMtOy\" dir=\"auto\"><span class=\"vsfWl MqvCC\">Aquests resultats de comportament sobre la regulaci\u00f3 de la ingesta d&#8217;aliment s\u00f3n consistents amb els observats en altres proves utilitzant extractes de plantes sensorials amb propietats antiestr\u00e8s.<\/span><\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block45\"><\/div>\n<div style=\"text-align: justify;\" data-breakout=\"normal\">\n<p id=\"viewer-aofl8\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><span class=\"vsfWl\"><u>Resultats en productivitat<\/u><\/span><\/p>\n<p class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><span class=\"vsfWl\"><u><br \/>\n<\/u><\/span>Tamb\u00e9 en aquest primer estudi, sembla que l\u2019\u00fas combinat de dos additius va augmentar la producci\u00f3 de llet en 0,79 L\/dia i 0,92 L\/dia en vaques prim\u00edpares i mult\u00edpares, respectivament. Aix\u00f2 va representar entre el 32 i el 35 de la variabilitat individual establerta per tractament. <\/p>\n<\/div>\n<div style=\"text-align: justify;\" data-hook=\"rcv-block49\">Tots dos productes utilitzats a m\u00e9s van donar bons resultats al ramat malgrat un per\u00edode d&#8217;estr\u00e8s per calor. Per tant, es considera un enfocament interessant per combinar amb les bones pr\u00e0ctiques ja implementades per limitar les conseq\u00fc\u00e8ncies de l&#8217;acidosi durant els per\u00edodes cr\u00edtics de calor-humitat que experimenten els nostres animals de producci\u00f3. <\/div>\n<div data-hook=\"rcv-block49\"><\/div>\n<div data-hook=\"rcv-block49\">\n<div data-breakout=\"normal\">\n<p id=\"viewer-egu4a\" class=\"Is4xI aaZkV rIsue OBvGv\" dir=\"auto\"><span class=\"vsfWl\"><em>Font:<\/em> <a class=\"CUBeV _2xrqk\" href=\"https:\/\/livestock-world.com\/acidosis-risk-dairy-cows\/\" target=\"_blank\" rel=\"noopener\" data-hook=\"WebLink\"><em><u>https:\/\/livestock-world.com\/acidosis-risk-dairy-cows\/<\/u><\/em><\/a><\/span><\/p>\n<\/div>\n<div data-hook=\"rcv-block52\"><\/div>\n<div data-breakout=\"normal\">\n<div id=\"viewer-9vvrc\" class=\"Is4xI aaZkV rIsue QMtOy\" dir=\"auto\"><\/div>\n<\/div>\n<\/div>\n","protected":false},"excerpt":{"rendered":"<p>L\u2019estr\u00e8s t\u00e8rmic ocorreix quan les vaques lleteres no poden eliminar adequadament la calor corporal, incrementant el risc d\u2019acidosi ruminal. Factors com l\u2019\u00edndex THI, l\u2019alta humitat i les temperatures elevades agreugen aquesta condici\u00f3, que afecta la ingesti\u00f3, la fermentaci\u00f3 ruminal i la salut general. Les p\u00e8rdues econ\u00f2miques derivades inclouen una reducci\u00f3 significativa en la producci\u00f3 i qualitat de llet, problemes reproductius i un major risc sanitari. Estrat\u00e8gies clau per a la seva prevenci\u00f3 inclouen l\u2019adaptaci\u00f3 d\u2019instal\u00b7lacions amb ventilaci\u00f3 i nebulitzaci\u00f3, la gesti\u00f3 de l\u2019alimentaci\u00f3 i la suplementaci\u00f3 amb additius sensorials naturals que modulen l\u2019estr\u00e8s i afavoreixen la funci\u00f3 digestiva, millorant el consum, la rumiaci\u00f3 i la producci\u00f3 durant episodis de calor intens.   <\/p>\n<p>Aquesta formulaci\u00f3 est\u00e0 basada en evid\u00e8ncia cient\u00edfica i pr\u00e0ctiques comercials provades per optimitzar la salut ruminal i l\u2019efici\u00e8ncia productiva en condicions d\u2019estr\u00e8s t\u00e8rmic en vaques lleteres.<\/p>\n","protected":false},"author":2,"featured_media":301,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","footnotes":""},"categories":[1],"tags":[],"class_list":["post-1736","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-sin-categorizar"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.4 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>Estr\u00e8s per calor i acidosi en vaques de llet - TECH-COMPLEX<\/title>\n<meta name=\"description\" content=\"L\u2019estr\u00e8s t\u00e8rmic en vaques lleteres eleva el risc d\u2019acidosi ruminal i redueix la producci\u00f3. 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