
{"id":5056,"date":"2021-05-05T12:54:07","date_gmt":"2021-05-05T12:54:07","guid":{"rendered":"https:\/\/aboutsmallruminants.com\/?p=5056"},"modified":"2021-05-05T12:54:07","modified_gmt":"2021-05-05T12:54:07","slug":"pis-mouton-chevre-anatomie-physiologie","status":"publish","type":"post","link":"https:\/\/aboutsmallruminants.com\/fr\/pis-mouton-chevre-anatomie-physiologie\/","title":{"rendered":"NOTIONS DE BASE SUR LE PIS : quel est son fonctionnement ?"},"content":{"rendered":"<div class=\"intro-text\"><strong>Comment le pis fonctionne-t-il\u00a0? Quelles sont les principales structures de la glande mammaire\u00a0? Comprendre l\u2019anatomie et la physiologie du pis est la premi\u00e8re \u00e9tape pour ma\u00eetriser le contr\u00f4le et la pr\u00e9vention de la mammite. Voici un bref r\u00e9sum\u00e9\u00a0!<\/strong><\/div>\n<p>&nbsp;<\/p>\n<h2>PRINCIPALES STRUCTURES DU PIS<\/h2>\n<p>La <strong>glande mammaire<\/strong> est constitu\u00e9e de deux structures principales\u00a0: le <strong>parenchyme<\/strong> et le <strong>stroma<\/strong>.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/smallruminants-udder-basics-anatomy-physiology.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4996 size-full\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/smallruminants-udder-basics-anatomy-physiology.jpg\" alt=\"sheep and goat udders\" width=\"652\" height=\"367\" srcset=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/smallruminants-udder-basics-anatomy-physiology.jpg 652w, https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/smallruminants-udder-basics-anatomy-physiology-300x169.jpg 300w\" sizes=\"auto, (max-width: 652px) 100vw, 652px\" \/><\/a><\/p>\n<p>Le parenchyme est la <strong>partie s\u00e9cr\u00e9toire de la glande<\/strong> et il est constitu\u00e9 par ce que l\u2019on appelle les syst\u00e8mes alv\u00e9olaire et tubulaire.<\/p>\n<p>Le stroma est compos\u00e9 d\u2019autres <strong>tissus compl\u00e9mentaires<\/strong> tels que\u00a0: syst\u00e8mes vasculaires sanguin et lymphatique, tissus adipeux, conjonctifs et nerveux.<\/p>\n<p>Le pis est compos\u00e9 de <strong>2\u00a0glandes mammaires anatomiquement distinctes<\/strong> chez les moutons et les ch\u00e8vres. Le pis est situ\u00e9 dans le <strong>r\u00e9gion inguinale<\/strong> avec une glande de chaque c\u00f4t\u00e9 de la ligne m\u00e9diane.<\/p>\n<p>Le lait est produit dans les alv\u00e9oles et est transport\u00e9 par un syst\u00e8me canaliculaire vers les citernes o\u00f9 il est stock\u00e9 avant d\u2019\u00eatre finalement \u00e9vacu\u00e9 pendant la traite.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/sheep-goats-udder-basics-anatomy-physiology.jpg\"><img loading=\"lazy\" decoding=\"async\" class=\"aligncenter wp-image-4990 size-full\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/sheep-goats-udder-basics-anatomy-physiology.jpg\" alt=\"small ruminants udders\" width=\"652\" height=\"367\" srcset=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/sheep-goats-udder-basics-anatomy-physiology.jpg 652w, https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/sheep-goats-udder-basics-anatomy-physiology-300x169.jpg 300w\" sizes=\"auto, (max-width: 652px) 100vw, 652px\" \/><\/a><\/p>\n<p>La glande mammaire stocke le lait de mani\u00e8re extracellulaire, et ce stockage peut \u00eatre expliqu\u00e9 par un mod\u00e8le de <strong>deux compartiments anatomiques<\/strong> :<\/p>\n<p style=\"padding-left: 40px;\">\u25cf <strong>Le lait alv\u00e9olaire<\/strong> (lait stock\u00e9 dans la lumi\u00e8re du tissus alv\u00e9olaire).<br \/>\n\u25cf\u00a0<strong>Le lait des citernes<\/strong> (lait drain\u00e9 \u00e0 partir des alv\u00e9oles et conserv\u00e9 dans les grands canaux, les citernes de la glande et le trayon).<\/p>\n<blockquote class=\"pullquote align-center\"><p><strong><span style=\"font-size: 20pt;\">\u00abChez les petits ruminants, l\u2019essentiel du lait est stock\u00e9 dans les citernes et non dans les alv\u00e9oles\u00bb<\/span><\/strong><\/p><\/blockquote>\n<p>&nbsp;<\/p>\n<h2>STOCKAGE ET LIB\u00c9RATION DU LAIT<\/h2>\n<p>D\u2019une mani\u00e8re g\u00e9n\u00e9rale, chez les petits ruminants laitiers, 30\u00a0% du lait sont stock\u00e9s dans les alv\u00e9oles, tandis que les 70\u00a0% restants sont stock\u00e9s dans les citernes du pis.<\/p>\n<p>Cependant, cela v<strong>arie en fonction de l\u2019esp\u00e8ce et du d\u00e9lai de la courbe<\/strong> de lactation. Le lait des citernes peut varier de 25 \u00e0 70\u00a0%, mais il est normalement de plus de 50\u00a0% chez les races laiti\u00e8res.<\/p>\n<p>Cela <strong>diff\u00e8re consid\u00e9rablement des vaches<\/strong>, chez qui c\u2019est le contraire, o\u00f9 70\u00a0% du lait sont stock\u00e9s dans les alv\u00e9oles, tandis que les 30\u00a0% subsistants restent dans les citernes du pis.<\/p>\n<p>L\u2019inhibition autocrine (ou locale) de la s\u00e9cr\u00e9tion de lait dans les glandes mammaires, qui r\u00e9sulte de longs intervalles entre les traites, a \u00e9t\u00e9 associ\u00e9e \u00e0 la taille des citernes.<\/p>\n<p>Par cons\u00e9quent, <strong>les animaux pr\u00e9sentant de grandes citernes produisent plus de lait<\/strong> et peuvent n\u00e9cessiter moins de traites par jour.<\/p>\n<p style=\"text-align: center;\"><a href=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-fr.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5068\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-fr.png\" alt=\"\" width=\"635\" height=\"448\" srcset=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-fr.png 635w, https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-fr-300x212.png 300w, https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-fr-120x86.png 120w\" sizes=\"auto, (max-width: 635px) 100vw, 635px\" \/><\/a><\/p>\n<p>&nbsp;<\/p>\n<p>Le trayon pr\u00e9sente \u00e9galement une citerne. Cependant, la partie la plus importante de cette r\u00e9gion est le <strong>sphincter du trayon<\/strong> et le <strong>bouchon de la k\u00e9ratine<\/strong>. Ils agissent comme une barri\u00e8re de protection contre les micro-organismes en \u00e9vitant la p\u00e9n\u00e9tration dans le pis.<\/p>\n<p>Le bouchon de k\u00e9ratine est lib\u00e9r\u00e9 quelques jours avant l\u2019agnelage\/la mise bas du chevreau et se r\u00e9g\u00e9n\u00e8re apr\u00e8s le tarissement de l\u2019animal.<\/p>\n<blockquote class=\"pullquote align-center\"><p><strong><span style=\"font-size: 20pt;\">\u00abLe bouchon de k\u00e9ratine est pr\u00e9sent pendant la p\u00e9riode de tarissement et agit comme une barri\u00e8re en \u00e9vitant l\u2019entr\u00e9e des bact\u00e9ries dans le pis\u00bb<\/span><\/strong><\/p><\/blockquote>\n<p style=\"text-align: center;\"><a href=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-2-fr.png\"><img loading=\"lazy\" decoding=\"async\" class=\"alignnone size-full wp-image-5073\" src=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-2-fr.png\" alt=\"\" width=\"635\" height=\"448\" srcset=\"https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-2-fr.png 635w, https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-2-fr-300x212.png 300w, https:\/\/aboutsmallruminants.com\/wp-content\/uploads\/2021\/05\/small-ruminants-2-fr-120x86.png 120w\" sizes=\"auto, (max-width: 635px) 100vw, 635px\" \/><\/a><\/p>\n<p>La <strong>lactogen\u00e8se<\/strong> (production de lait) commence entre les jours\u00a095 et 100 de la grossesse, avec la d\u00e9tection de lactose (apparition de la lactogen\u00e8se) <strong>apr\u00e8s le jour\u00a0100<\/strong>.<\/p>\n<p>Le processus inverse survient pendant la p\u00e9riode de tarissement lorsque les alv\u00e9oles disparaissent totalement apr\u00e8s 3 \u00e0 4\u00a0semaines et sont remplac\u00e9es par des adipocytes.<\/p>\n<p>Au cours du processus d\u2019<strong>involution<\/strong>, la glande mammaire est envahie par <strong>des macrophages et des lymphocytes<\/strong>, qui sont essentiels pour la synth\u00e8se des immunoglobulines et la production de colostrum pour la prochaine gestation.<\/p>\n<blockquote class=\"pullquote align-center\"><p><strong><span style=\"font-size: 20pt;\">\u00abLa lactogen\u00e8se commence apr\u00e8s le jour 100 de la grossesse\u00bb<\/span><\/strong><\/p><\/blockquote>\n<p>La <strong>morphologie mammaire<\/strong> et la <a href=\"https:\/\/aboutsmallruminants.com\/fr\/conformation-du-pis-mammite\/\" target=\"_blank\" rel=\"noopener noreferrer\">conformation du pis<\/a> sont un facteur cl\u00e9 pour l\u2019optimisation des<strong> capacit\u00e9s des machines de traite<\/strong> chez les ruminants. Des diff\u00e9rences significatives peuvent exister entre les esp\u00e8ces et m\u00eame entre les animaux d\u2019un m\u00eame troupeau\/cheptel.<\/p>\n<p>La conformation du pis semble \u00eatre le facteur le plus limitant pour une bonne traite par machine, et une mauvaise conformation de pis est li\u00e9e \u00e0 un risque plus \u00e9lev\u00e9 de <a href=\"https:\/\/www.hipra.com\/portal\/fr\/hipra\/knowledge\/bgdetail\/mastitis-in-small-ruminants\/mastitis-in-small-ruminants\" target=\"_blank\" rel=\"noopener noreferrer\">mammite<\/a> chez les animaux traits.<\/p>\n<blockquote class=\"pullquote align-center\"><p><strong><span style=\"font-size: 20pt;\">\u00abLa conformation du pis est essentielle pour r\u00e9duire le risque de mammite\u00bb<\/span><\/strong><\/p><\/blockquote>\n<p>&nbsp;<\/p>\n<p><strong>Auteur:<\/strong><\/p>\n<p style=\"padding-left: 30px;\"><span style=\"font-size: small;\">Miguel \u00c1ngel Sanz Franco, DVM, sp\u00e9cialiste technique des petits ruminants, HIPRA Espagne.<\/span><\/p>\n","protected":false},"excerpt":{"rendered":"<p>Comment le pis fonctionne-t-il\u00a0? Quelles sont les principales structures de la glande mammaire\u00a0? Comprendre l\u2019anatomie et la physiologie du pis est la premi\u00e8re \u00e9tape pour ma\u00eetriser le contr\u00f4le et la pr\u00e9vention de la mammite. Voici un bref r\u00e9sum\u00e9\u00a0! &nbsp; PRINCIPALES STRUCTURES DU PIS La glande mammaire est constitu\u00e9e de deux structures principales\u00a0: le parenchyme et [&hellip;]<\/p>\n","protected":false},"author":5,"featured_media":4996,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[39],"tags":[],"class_list":["post-5056","post","type-post","status-publish","format-standard","has-post-thumbnail","hentry","category-mammites"],"yoast_head":"<!-- This site is optimized with the Yoast SEO plugin v26.5 - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Pis de mouton et de ch\u00e8vre : Introduction \u00e0 l\u2019anatomie et \u00e0 la physiologie<\/title>\n<meta name=\"description\" content=\"Comprendre l\u2019anatomie et la physiologie du pis est la premi\u00e8re \u00e9tape pour ma\u00eetriser le contr\u00f4le et la pr\u00e9vention de la mammite.\" \/>\n<meta name=\"robots\" content=\"index, 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