{"id":2764,"date":"2017-07-01T11:00:03","date_gmt":"2017-07-01T10:00:03","guid":{"rendered":"https:\/\/awecadvisors.org\/lagressivitat-entre-porcs-i-les-consequencies-sobre-el-benestar\/"},"modified":"2024-04-15T16:00:49","modified_gmt":"2024-04-15T15:00:49","slug":"lagressivitat-entre-porcs-i-les-consequencies-sobre-el-benestar","status":"publish","type":"post","link":"https:\/\/awecadvisors.org\/ca\/animals-de-granja\/lagressivitat-entre-porcs-i-les-consequencies-sobre-el-benestar\/","title":{"rendered":"L&#8217;agressivitat entre porcs i les conseq\u00fc\u00e8ncies sobre el benestar"},"content":{"rendered":"<p><strong>Pol Llonch, Eva Mainau, D\u00e9borah Temple, Xavier Manteca<\/strong><\/p>\n<p><a href=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/08\/doc_mes_info_FS19_es.pdf\" target=\"_blank\" rel=\"noopener\">M\u00e9s informaci\u00f3<\/a><br \/>\n<a href=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/08\/Ficha_Tecnica_FAWEC_n19_Es.pdf\" target=\"_blank\" rel=\"noopener\">Descarregar PDF <\/a><\/p>\n<p>L&#8217;agressivitat als porcs \u00e9s un comportament natural que es produeix quan es barregen animals desconeguts per establir una jerarquia. Les agressions s\u00f3n des d&#8217;amenaces o trobades agressives sense contacte fins a agressions amb contacte que poden provocar ferides. A les explotacions porcines, la barreja d&#8217;animals \u00e9s una pr\u00e0ctica comuna; les agressions poden oc\u00f3rrer en repetides ocasions, comportant conseq\u00fc\u00e8ncies negatives sobre el benestar tals com a estr\u00e8s, ferides i en algunes ocasions, fins i tot la mort de l&#8217;animal. Aix\u00ed doncs, per millorar el benestar animal, cal implementar estrat\u00e8gies per prevenir o reduir les interaccions agressives entre els porcs.<\/p>\n<h3>Per qu\u00e8 es produeixen les agressions als porcs?<\/h3>\n<p>Els porcs s\u00f3n animals gregaris i la seva estructura social es basa en la relaci\u00f3 de domin\u00e0ncia \u2013 subordinaci\u00f3 per establir la jerarquia. La ra\u00f3 d&#8217;aquesta organitzaci\u00f3 social \u00e9s establir un ordre per accedir als recursos quan aquests s\u00f3n limitats. La formaci\u00f3 de la jerarquia es basa en la relaci\u00f3 de domin\u00e0ncia \u2013 subordinaci\u00f3 i passa despr\u00e9s de la barreja d&#8217;animals desconeguts, i al llarg de les 24-48 hores seg\u00fcents. Els porcs utilitzen les agressions per establir la relaci\u00f3 de domin\u00e0ncia-subordinaci\u00f3. L&#8217;escassetat de recursos com el menjar, l&#8217;aigua o l&#8217;espai per descansar facilita la compet\u00e8ncia i les baralles. Per exemple, quan el pinso est\u00e0 restringit, els porcs dominants accediran primer al menjar, i els seguiran els subordinats.<\/p>\n<p>En un grup de porcs, un cop establerta la jerarquia, les agressions disminueixen dr\u00e0sticament. No obstant aix\u00f2, quan el grup canvia, la jerarquia es trenca i cal restablir la relaci\u00f3 de domin\u00e0ncia-subordinaci\u00f3. La barreja de porcs \u00e9s una de les situacions m\u00e9s comunes en qu\u00e8 es trenca la jerarquia i provoca l&#8217;augment d&#8217;agressions. A les explotacions porcines, les agressions degut a la barreja d&#8217;animals tenen lloc en diferents ocasions, com ara deslletar, quan es transporten porcs a altres granges o a l&#8217;escorxador i durant la formaci\u00f3 de grups en truges gestants. En qualsevol cas, l&#8217;objectiu de la barreja \u00e9s obtenir grups d&#8217;animals tan homogenis com sigui possible en edat i pes.<\/p>\n<div id=\"attachment_1017\" style=\"width: 310px\" class=\"wp-caption alignnone\"><img loading=\"lazy\" decoding=\"async\" aria-describedby=\"caption-attachment-1017\" class=\"size-full wp-image-1017\" src=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/08\/agresividad-en-los-cerdos.jpg\" alt=\"\" width=\"300\" height=\"225\" \/><p id=\"caption-attachment-1017\" class=\"wp-caption-text\">Agressi\u00f3 en una postura paral\u00b7lela inversa en truges nul\u00b7l\u00edpares en barrejar-se.<\/p><\/div>\n<h3>Factors implicats en l&#8217;agressivitat dels porcs<\/h3>\n<p>En un grup de porcs, el grau d&#8217;agressivitat \u00e9s determinat per:<\/p>\n<ul>\n<li><strong>Agressivitat individual i temperament:<\/strong> El temperament consisteix en les difer\u00e8ncies individuals en el comportament, que s\u00f3n estables en diferents situacions i al llarg del temps. Els animals m\u00e9s temperamentals s\u00f3n m\u00e9s propensos a ser agressius. L&#8217;agressivitat \u00e9s heredit\u00e0ria i hi ha alguns gens (NR3C1 i AVPR1B) que han estat associats a l&#8217;agressivitat.<\/li>\n<li><strong>Pes corporal:<\/strong> Influeix en la percepci\u00f3 d&#8217;un individu sobre les possibilitats de guanyar una baralla. Aix\u00ed, doncs, els animals m\u00e9s grossos se senten m\u00e9s segurs de si mateixos i participaran m\u00e9s sovint en baralles. A m\u00e9s, la intensitat de les agressions \u00e9s m\u00e9s gran quan els animals tenen pesos semblants.<\/li>\n<li><strong>Sexe:<\/strong> El comportament agressiu est\u00e0 intervingut per factors endocrins associats al sexe, cosa que fa que els mascles siguin generalment m\u00e9s agressius que les femelles.<\/li>\n<\/ul>\n<p>Les agressions als porcs tamb\u00e9 es poden veure afectades per les condicions d&#8217;allotjament. L&#8217;espai \u00e9s un recurs, per\u00f2 tamb\u00e9 pot ser un facilitador quan els porcs interaccionen, cosa que pot resultar en agressions. En aquest sentit, tant l&#8217;espai com la densitat juguen un paper fonamental. Les densitats altes permeten interaccions socials entre companys, tant positives com negatives, de manera que el nombre total d&#8217;agressions pot augmentar. Per exemple, alguns estudis demostren que reduint la densitat al 50%, les agressions disminueixen a un ter\u00e7 els valors inicials. Alhora, la disponibilitat d&#8217;espai \u00e9s tamb\u00e9 determinant; \u00e0rees m\u00e9s grans poden ajudar els animals agredits a fugir de l&#8217;agressor, i redueixen el nombre d&#8217;agressions negatives.<\/p>\n<h3>Implicacions per al benestar dels porcs<\/h3>\n<p>Les agressions s\u00f3n molt estressants per als porcs, especialment durant les baralles on hi ha una gran mobilitzaci\u00f3 de reserves d&#8217;energia. L&#8217;estr\u00e8s indu\u00eft per les agressions provoca immunosupressi\u00f3, cosa que redueix la capacitat de l&#8217;animal per protegir-se contra els agents infecciosos amena\u00e7adors i augmenta el risc d&#8217;emmalaltir-se. El deslletament \u00e9s un dels moments m\u00e9s estressants de la vida d&#8217;un porc, sobretot per les agressions produ\u00efdes durant la barreja de garrins desconeguts. Hi ha una associaci\u00f3 entre la reducci\u00f3 de la immunocompet\u00e8ncia en el deslletament amb un augment de les malalties gastrointestinals com ara la diarrea. L&#8217;estr\u00e8s indu\u00eft per les agressions tamb\u00e9 pot provocar la disminuci\u00f3 del consum d&#8217;aliment, i per tant una disminuci\u00f3 en el creixement dels animals.<\/p>\n<p>Les ferides tenen conseq\u00fc\u00e8ncies sobre el benestar animal, ja que s\u00f3n una font de dolor. Les agressions, sobretot les produ\u00efdes en baralles severes, poden provocar des de lesions lleus a la pell fins a lesions greus que arriben als teixits per sota de la pell. Un exemple seria les lesions a la vulva en truges gestants allotjades en grup i provocades durant les agressions en el moment dels \u00e0pats. A m\u00e9s del dolor, les ferides i lesions s\u00f3n una amena\u00e7a per a la salut de l&#8217;animal, ja que es poden infectar i provocar malalties com ara la septic\u00e8mia i, eventualment, la mort. La implantaci\u00f3 de mesures preventives per reduir l&#8217;agressivitat als porcs pot disminuir l&#8217;aparici\u00f3 de malaltia i en conseq\u00fc\u00e8ncia l&#8217;\u00fas de tractaments contra aquestes malalties, com ara els antibi\u00f2tics i els analg\u00e8sics.<\/p>\n<p>En truges gestants allotjades en grup, les agressions que es produeixen durant el primer mes de gestaci\u00f3 han estat associades amb avortaments. Aquesta \u00e9s la ra\u00f3 per la qual, en algunes normatives sobre benestar (p.e. Directiva 2008\/120\/EC del Consell Europeu), les truges gestants poden allotjar-se en g\u00e0bies durant quatre setmanes despr\u00e9s de la inseminaci\u00f3. Tot i aix\u00f2, despr\u00e9s d&#8217;aquest per\u00edode, no hi ha cap evid\u00e8ncia que demostri que les agressions entre truges influeixin en el rendiment reproductiu.<\/p>\n<h3><strong><em>\u201cLes baralles produeixen por, estr\u00e8s i problemes de salut als porcs\u201d<\/em><\/strong><\/h3>\n<h3>Estrat\u00e8gies per prevenir les agressions als porcs<\/h3>\n<p>Les agressions al deslletament es poden prevenir si els garrins se socialitzen durant la lactaci\u00f3. La socialitzaci\u00f3 durant les dues primeres setmanes despr\u00e9s del naixement millora les habilitats socials dels garrins i redueix les interaccions agressives en futures barreges. Per exemple, un estudi indica que els garrins procedents de camades barrejades durant la lactaci\u00f3 van tenir menys lesions a la pell quan es van barrejar al deslletament, que els garrins procedents de camades que no s&#8217;havien barrejats pr\u00e8viament. Una altra estrat\u00e8gia per reduir les agressions al deslletament seria fer \u00fas de feromones maternals sint\u00e8tiques. Diferents estudis demostren que les feromones redueixen el nombre de ferides a la pell, aix\u00ed com el temps que els animals es barallen.<\/p>\n<p>En truges gestants allotjades en grup, les agressions es poden prevenir minimitzant els canvis en l&#8217;estructura social del grup. No obstant aix\u00f2, no sempre es pot aconseguir ja que les repeticions del zel poden provocar canvis en els grups de truges. A m\u00e9s, algunes granges utilitzen truges allotjades en grups din\u00e0mics, on els fluxos d&#8217;entrada i sortida de truges al grup \u00e9s freq\u00fcent. En aquest cas, les agressions poden disminuir si el maneig de les truges es fa mitjan\u00e7ant lots de 5-6 truges. El maneig dels recursos ofereix la possibilitat de reduir les agressions, ja que aquestes sobretot ocorren quan l&#8217;acc\u00e9s als recursos (p.e. el menjar) \u00e9s limitat. Les truges gestants normalment estan restringides en quant al consum d&#8217;aliment, cosa que accentua aquest problema. Hi ha evid\u00e8ncies que demostren que donar aliment\u00a0<em>ad libitum<\/em>\u00a0durant la barreja d&#8217;animals redueix les lesions greus en la pell, cosa que indica que es produeixen agressions menys intenses. D&#8217;altra banda, les estacions d&#8217;alimentaci\u00f3 electr\u00f2niques amb protecci\u00f3 (les truges poden menjar sense ser despla\u00e7ades) tamb\u00e9 \u00e9s una alternativa, encara que m\u00e9s costosa que els sistemes d&#8217;alimentaci\u00f3 en grup. La pres\u00e8ncia d&#8217;un verro engabiat i visible, proper al grup de truges, tamb\u00e9 pot ajudar a reduir el nombre d&#8217;interaccions agressives, probablement a causa del paper dominant del verro sobre el grup de truges.<\/p>\n<p>Hi ha altres estrat\u00e8gies que es poden aplicar al llarg de totes les fases de la producci\u00f3 porcina (p.e. cria de garrins, porcs d&#8217;engreix i truges gestants). Per exemple, el disseny del corral pot facilitar que els porcs agredits s&#8217;amaguin o s&#8217;escapin de l&#8217;agressor. Exemples d&#8217;aquesta estrat\u00e8gia seria la pres\u00e8ncia de barreres al corral, o la pres\u00e8ncia de s\u00f2ls a nivells diferents.<\/p>\n<p>En moments de m\u00e0xima agressivitat, tamb\u00e9 es pot proporcionar material de llit fresc (pe palla). Tot i aix\u00f2, encara que la seva efic\u00e0cia ha estat demostrada en algunes circumst\u00e0ncies, no ha tingut \u00e8xit per prevenir les agressions a llarg termini.<\/p>\n<h3>Resum<\/h3>\n<table>\n<tbody>\n<tr>\n<td>Els porcs s\u00f3n animals socials que estableixen les relacions de domin\u00e0ncia-subordinaci\u00f3 mitjan\u00e7ant les agressions. Les agressions amb i sense contacte ocorren quan es barregen porcs desconeguts i poden ser un problema de benestar si condueixen a estr\u00e8s o causen ferides. Reduir les agressions millora el benestar animal, ja que es redueix l&#8217;estr\u00e8s i les lesions i millora l&#8217;estat de salut dels porcs. Les estrat\u00e8gies m\u00e9s destacables per reduir les agressions s\u00f3n mantenir els grups socials estables, reduir la densitat i facilitar l&#8217;acc\u00e9s als recursos, com ara el menjar.<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>Refer\u00e8ncies<\/h3>\n<ul>\n<li>Erhard HW, Mendl M &amp; Ashley DD, 1997. Individual aggressiveness of pigs can be measured and used to reduce aggression after mixing. Applied Animal Behaviour Science, 54, 137-151.<\/li>\n<li>Camerlink I, Turner SP, Bijma P &amp; Bolhuis JE, 2013. Indirect genetic effects and housing conditions in relation to aggressive behaviour in pigs. PloS one, 8, e65136.<\/li>\n<li>Turner SP, Roehe R, D\u2019Eath RB, Ison S., Farish M, Jack MC, Lundeheim N, Rydhmer L &amp; Lawrence AB, 2009. Genetic validation of postmixing skin injuries in pigs as an indicator of aggressiveness and the relationship with injuries under more stable social conditions. Journal of Animal Science, 87, 3076-3082.<\/li>\n<\/ul>\n<span class=\"et_bloom_bottom_trigger\"><\/span>","protected":false},"excerpt":{"rendered":"<p>L&#8217;agressivitat als porcs \u00e9s un comportament natural que es produeix quan es barregen animals desconeguts per establir una jerarquia. <\/p>\n","protected":false},"author":8,"featured_media":1568,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"_et_pb_use_builder":"","_et_pb_old_content":"","_et_gb_content_width":"","inline_featured_image":false,"footnotes":""},"categories":[127],"tags":[118],"class_list":["post-2764","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-animals-de-granja","tag-animals-de-granja"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v27.1.1 - https:\/\/yoast.com\/product\/yoast-seo-wordpress\/ -->\n<title>L&#039;agressivitat entre porcs i les conseq\u00fc\u00e8ncies sobre el benestar - 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