{"id":2707,"date":"2015-11-01T02:10:32","date_gmt":"2015-11-01T01:10:32","guid":{"rendered":"https:\/\/awecadvisors.org\/dolor-i-incomoditat-de-la-glandula-mamaria-de-les-vaques-de-llet-a-lassecatge\/"},"modified":"2024-04-06T14:37:55","modified_gmt":"2024-04-06T13:37:55","slug":"dolor-i-incomoditat-de-la-glandula-mamaria-de-les-vaques-de-llet-a-lassecatge","status":"publish","type":"post","link":"https:\/\/awecadvisors.org\/ca\/animals-de-granja\/dolor-i-incomoditat-de-la-glandula-mamaria-de-les-vaques-de-llet-a-lassecatge\/","title":{"rendered":"Dolor i incomoditat de la gl\u00e0ndula mam\u00e0ria de les vaques de llet a l&#8217;assecatge"},"content":{"rendered":"<p><strong>Eva Mainau, D\u00e9borah Temple, Xavier Manteca<\/strong><\/p>\n<p><a href=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/doc_mes_info_FS14.pdf\" target=\"_blank\" rel=\"noopener\">M\u00e9s informaci\u00f3<\/a><br \/>\n<a href=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/FichaTecnica_FAWEC14_n14_dolor_secado_es.pdf\" target=\"_blank\" rel=\"noopener\">Descarregar PDF <\/a><\/p>\n<p>L&#8217;assecat de les vaques de llet implica la interrupci\u00f3 gradual o brusca de la munyida. La interrupci\u00f3 gradual de la munyida s&#8217;aconsegueix reduint l&#8217;energia consumida (menys aliment) o reduint la freq\u00fc\u00e8ncia de munyida abans de l&#8217;assecat. Aquests dos procediments estan associats amb la congesti\u00f3 del braguer causant incomoditat i dolor, que s\u00f3n m\u00e9s pronunciats en el cas de les vaques d&#8217;alta producci\u00f3 i quan l&#8217;assecatge \u00e9s brusc.<\/p>\n<h2>Canvis fisiol\u00f2gics a la gl\u00e0ndula mam\u00e0ria<\/h2>\n<p>A l&#8217;assecatge, la gl\u00e0ndula mam\u00e0ria continua sintetitzant i secretant llet incrementant la pressi\u00f3 intramam\u00e0ria podent causar dolor i incomoditat. La llet s&#8217;acumula als alv\u00e8ols i els conductes galact\u00f2fors de la gl\u00e0ndula mam\u00e0ria produint distensi\u00f3 del braguer 16 hores despr\u00e9s de l&#8217;inici de l&#8217;assecatge. Posteriorment, hi ha una degeneraci\u00f3 de les c\u00e8l\u00b7lules secretores seguit d&#8217;una disrupci\u00f3 de les estructures alveolars i lobulars del braguer. Unes 16-18 hores posteriors a l&#8217;assecatge, la pressi\u00f3 intramam\u00e0ria augmenta r\u00e0pidament produint goteig de llet i una <strong>resposta inflamat\u00f2ria moderada<\/strong>. La inflamaci\u00f3 produeix un augment transitori del flux de sang, un increment del nombre de neutr\u00f2fils a la llet i uns canvis a les unions estretes. La pressi\u00f3 intramam\u00e0ria arriba al m\u00e0xim 2 dies despr\u00e9s de l&#8217;assecat, despr\u00e9s baixa, per\u00f2 \u00e9s present durant els 4 o 6 dies posteriors a l&#8217;assecat brusc.<\/p>\n<h2>Factors que afecten el dolor causat per l&#8217;assecat<\/h2>\n<ol>\n<li><strong>Factors que afecten el dolor causat per l&#8217;assecat<\/strong><\/li>\n<p>Les vaques que produeixen m\u00e9s llet a l&#8217;assecatge (>20Kg\/dia) tenen volums majors de secreci\u00f3 mam\u00e0ria durant l&#8217;inici de la involuci\u00f3 comparat amb les vaques que produeixen menors quantitats de llet (<15Kg\/dia). Actualment, l'assecatge suposa la interrupci\u00f3 de la munyida de vaques que estan produint quantitats significatives de llet, com ara 20-35Kg\/dia, i en alguns casos fins i tot fins 50Kg\/dia. El risc de dolor a causa de la congesti\u00f3 del braguer durant l'assecatge \u00e9s m\u00e9s gran a les vaques d'alta producci\u00f3. \n\n<li>\n<p><strong>Interrupci\u00f3 brusca de la munyida<\/strong><\/li>\n<p>La interrupci\u00f3 brusca de la munyida uns 40 &#8211; 50 dies abans del dia previst de part \u00e9s una pr\u00e0ctica de maneig freq\u00fcent. Algunes granges prefereixen disminuir la freq\u00fc\u00e8ncia de munyida diversos dies abans de l&#8217;assecat per reduir la producci\u00f3 de llet. Tot i aix\u00ed, hi ha algunes evid\u00e8ncies que aquesta pr\u00e0ctica podria causar cert grau d&#8217;incomoditat a causa de la distensi\u00f3 del braguer.<\/p>\n<li><strong>Les prim\u00edpares<\/strong><\/li>\n<p>Les vaques prim\u00edpares poden experimentar m\u00e9s incomoditat durant l&#8217;assecatge que les vaques mult\u00edpares. A banda de la seva manca d&#8217;experi\u00e8ncia pr\u00e8via, les vaques prim\u00edpares tenen una corba de lactaci\u00f3 amb m\u00e9s persist\u00e8ncia i una immaduresa relativa de la gl\u00e0ndula mam\u00e0ria. Aquests factors poden disminuir la toler\u00e0ncia de les vaques prim\u00edpares a les pressions intramam\u00e0ries altes.\n<\/ol>\n<h2>Indicadors de dolor causats per l&#8217;assecat<\/h2>\n<ol>\n<li><strong>Conducta de rep\u00f2s<\/strong><\/li>\n<p>Les vaques redueixen la seva conducta de rep\u00f2s com a resultat del dolor al braguer, probablement en un intent d&#8217;alleujar la pressi\u00f3 que pateixen sobre aquesta zona. Aix\u00f2 s&#8217;explicar\u00e0 m\u00e9s detalladament a la propera fitxa t\u00e8cnica.<\/p>\n<li><strong>Resposta de comportament a la manipulaci\u00f3 del braguer<\/strong><\/li>\n<p>L&#8217;avaluaci\u00f3 de la reacci\u00f3 dels animals quan estan sent manipulats \u00e9s un m\u00e8tode que es fa servir de forma comuna per valorar el dolor. Aquest m\u00e8tode es considera v\u00e0lid i fiable sempre que la reacci\u00f3 de l&#8217;animal sigui puntuada de manera estandarditzada. La sensibilitat al dolor ha estat quantificada usant l&#8217;estimulaci\u00f3 mec\u00e0nica (alg\u00f2metres) o t\u00e8rmica (l\u00e0ser de CO2) en una de les potes posteriors o directament a sobre del braguer. Aquests m\u00e8todes mesuren el llindar nociceptiu, que es defineix com el menor est\u00edmul necessari per provocar una resposta de dolor. Quan un est\u00edmul s&#8217;aplica en una zona dolorosa, la vaca respon amb un comportament d&#8217;evitaci\u00f3 com per exemple, donant patades, aixecant la pota o sacsejant la cua intensament. La disminuci\u00f3 del llindar nociceptiu es tradueix en una sensaci\u00f3 dolorosa m\u00e9s gran. Fins ara, l&#8217;\u00fas d&#8217;aquests m\u00e8todes en vaques de llet s&#8217;ha dirigit especialment a l&#8217;avaluaci\u00f3 de dolor associat a coixeses o mamitis. Recentment, s&#8217;ha descrit una escala per avaluar el dolor al braguer associat a la congesti\u00f3 del braguer de les vaques seques. Les vaques s\u00f3n classificades en 4 categories (0=sense dolor al braguer; 1=dolor lleuger al braguer; 2=dolor moderat al braguer; 3=dolor fort al braguer) depenent de la seva reacci\u00f3 a la palpaci\u00f3 del braguer (des de no tenir cap resposta de comportament a mostrar rebuig a la palpaci\u00f3). Hi ha evid\u00e8ncies que indiquen que l&#8217;endem\u00e0 de l&#8217;assecat al voltant del 21% de les vaques pateixen dolor al braguer en resposta a la seva congesti\u00f3.<\/p>\n<li><strong>Mesures de congesti\u00f3 i pressi\u00f3 del braguer<\/strong><\/li>\n<p>Un cop s&#8217;interromp la munyida, la llet acumulada al teixit mamari causa un augment de la pressi\u00f3 intramam\u00e0ria. La congesti\u00f3 del braguer despr\u00e9s de l&#8217;inici de l&#8217;assecatge reflecteix l&#8217;alta pressi\u00f3 que hi ha dins del braguer. Aquesta pressi\u00f3 pot conduir al deteriorament del teixit i causar dolor. Algunes mesures de congesti\u00f3 i\/o pressi\u00f3 del braguer han estat suggerides com a mesures indirectes de dolor al braguer:<\/p>\n<ul>\n<li>La pressi\u00f3 al braguer es pot mesurar aplicant est\u00edmuls mec\u00e0nics en aquesta zona o mitjan\u00e7ant palpaci\u00f3.<\/li>\n<li>La variaci\u00f3 en la dist\u00e0ncia entre mugrons abans de l&#8217;\u00faltima munyida i l&#8217;endem\u00e0 de l&#8217;assecatge \u00e9s una mesura pr\u00e0ctica per avaluar la congesti\u00f3 del braguer.<\/li>\n<li>El degoteig de llet de la gl\u00e0ndula mam\u00e0ria es defineix com el flux o gota de llet que cau des d&#8217;un mugr\u00f3 i \u00e9s un factor de risc per al desenvolupament d&#8217;infeccions intramam\u00e0ries.<\/li>\n<li>L&#8217;increment de les vocalitzacions pot ser indicatiu del dolor a causa de la congesti\u00f3 del braguer, aix\u00ed com de per\u00edodes d&#8217;estr\u00e8s intens o de gana durant l&#8217;assecat.<\/li>\n<\/ul>\n<h2>L&#8217;assecat \u00e9s una situaci\u00f3 estressant<\/h2>\n<p>L&#8217;assecat causa estr\u00e8s fisiol\u00f2gic. El dolor causat per l&#8217;elevada pressi\u00f3 intramam\u00e0ria despr\u00e9s de l&#8217;inici de l&#8217;assecatge s&#8217;acompanya d&#8217;una resposta d&#8217;estr\u00e8s. Les vaques d&#8217;alta producci\u00f3 amb un assecat brusc, en lloc de gradual, mostren una pressi\u00f3 m\u00e9s gran al braguer, i un major increment de la concentraci\u00f3 fecal de glucocorticoides, que \u00e9s un indicador d&#8217;estr\u00e8s cr\u00f2nic. A m\u00e9s, qualsevol situaci\u00f3 nova pot desencadenar estr\u00e8s. L&#8217;assecat se sol associar amb diverses pr\u00e0ctiques de maneig que poden ser percebudes per l&#8217;animal com a factors estressants. Per exemple, les vaques seques es traslladen a un altre corral on es reagrupen amb altres vaques i on reben una dieta baixa en energia. Cal destacar que l&#8217;estr\u00e8s \u00e9s sumatori i que el risc de patir infeccions intramam\u00e0ries s&#8217;incrementa amb la resposta d&#8217;estr\u00e8s.<\/p>\n<h2>Recomanacions en el maneig i el tractament del dolor<\/h2>\n<ol>\n<li>Minimitzar situacions que poden causar estr\u00e8s cr\u00f2nic, com ara la competici\u00f3 pel menjar, l&#8217;aigua o un lloc confortable per descansar i jeure. Idealment, els corrals han d&#8217;incloure una menjadora suficientment llarga perqu\u00e8 totes les vaques puguin menjar al mateix temps (m\u00ednim 0,76 m de menjadora per vaca). A m\u00e9s, cada corral hauria de tenir almenys dos punts d&#8217;aigua que funcionin correctament.<\/li>\n<li>Un cop s&#8217;inicia l&#8217;assecatge, es recomana observar les vaques. Identificar el possible degoteig de llet, palpar el braguer i avaluar el dolor al braguer pot ser \u00fatil per estimar la incid\u00e8ncia de problemes de benestar relacionats amb l&#8217;assecat.<\/li>\n<li>Es recomana inhibir la producci\u00f3 de prolactina a les vaques d&#8217;alta producci\u00f3 per reduir la producci\u00f3 de llet a l&#8217;assecatge i per estimular la involuci\u00f3 mam\u00e0ria. Per exemple, l&#8217;\u00fas d&#8217;una dosi \u00fanica de cabergolina a l&#8217;assecatge, com a potencial facilitador de l&#8217;assecatge, redueix de manera efectiva el degoteig de llet, la incomoditat i el dolor a causa de la congesti\u00f3 del braguer.<\/li>\n<\/ol>\n<div id=\"attachment_1179\" style=\"width: 1610px\" class=\"wp-caption alignnone\"><img decoding=\"async\" aria-describedby=\"caption-attachment-1179\" src=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/algometer3.jpg\" alt=\"\" width =\"1600\" height=\"1200\" class=\"size-full wp-image-1179\" srcset=\"https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/algometer3.jpg 1600w, https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/algometer3-1280x960.jpg 1280w, https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/algometer3-980x735.jpg 980w, https:\/\/awecadvisors.org\/wp-content\/uploads\/2023\/09\/algometer3-480x360.jpg 480w\" sizes=\"(min-width: 0px) and (max-width: 480px) 480px, (min-width: 481px) and (max-width: 980px) 980px, (min-width: 981px) and (max-width: 1280px) 1280px, (min-width: 1281px) 1600px, 100vw\" \/><p id=\"caption-attachment-1179\" class=\"wp-caption-text\">Determinaci\u00f3 de la congesti\u00f3 del braguer mitjan\u00e7ant l&#8217;\u00fas d&#8217;un alg\u00f2metre digital modificat per la soldadura d&#8217;una volandera de 2cm a 2cm de la punta de l&#8217;alg\u00f2metre (Bach i col\u00b7l. 2015)<br \/>(Foto cortesia de l&#8217;institut de recerca IRTA, Espanya)<\/p><\/div>\n<h3>Resum<\/h3>\n<table>\n<tbody>\n<tr>\n<td>L&#8217;assecat \u00e9s un per\u00edode dolor\u00f3s i estressant. El braguer continua sintetitzant i secretant llet durant la involuci\u00f3 resultant en un augment de la pressi\u00f3 intramam\u00e0ria que potencialment pot causar dolor a les vaques. El risc \u00e9s m\u00e9s gran en el cas de vaques d&#8217;alta producci\u00f3 que han estat assecades de forma brusca. L&#8217;observaci\u00f3 del comportament de rebuig a la palpaci\u00f3 del braguer ajuda a detectar les vaques que pateixen dolor. Es recomana l&#8217;\u00fas d&#8217;inhibidors de prolactina com a facilitadors de l&#8217;assecatge ja que estimulen la involuci\u00f3 mam\u00e0ria i redueixen el dolor. <\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<hr \/>\n<h3>Refer\u00e8ncies<\/h3>\n<ul>\n<li> Bach A, De-Prado A, Aris A 2015. Short communication: The effects of cabergoline administration at dry-off of lactating cows on udder engorgement, milk leakages, and lying behaviour. Journal of Dairy Science 98: 1-5.<\/li>\n<li>\nBertulat S, Fischer-Tenhagen C, Suthar V, M\u00f6stl E, Isaka N, Heuwieser W 2013. Measurement of fecal glucocorticoid metabolites and evaluation of udder characteristics to estimate stress after sudden dry-off in dairy cows with different milk yields. Journal of Dairy Science 96: 3774-3787.<\/li>\n<li>\nChapinal N, Zobel G, Painter K, Leslie KE 2014. Changes in lying behaviour after abrupt cessation of milking and regrouping at dry-off in freestall-housed cows: A case study. Journal of Veterinary Behavior 9: 364-369.<\/li>\n<li>Davis SR, Farr VC, Stelwagen K 1999. Regulation of yield loss and milk composition during once-daily milking: a review. Livestock Production Science 59: 77-94.\t<\/li>\n<\/ul>\n<span class=\"et_bloom_bottom_trigger\"><\/span>","protected":false},"excerpt":{"rendered":"<p>L&#8217;assecat de les vaques de llet implica la interrupci\u00f3 gradual o brusca de la munyida.<\/p>\n","protected":false},"author":7,"featured_media":1514,"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-2707","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>Dolor i incomoditat de la gl\u00e0ndula mam\u00e0ria de les vaques de llet a l&#039;assecatge - Awec<\/title>\n<meta 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