{"id":2828,"date":"2024-03-23T18:05:11","date_gmt":"2024-03-23T17:05:11","guid":{"rendered":"https:\/\/www.rumexperts.vet\/?post_type=training&#038;p=2828"},"modified":"2024-03-23T18:05:11","modified_gmt":"2024-03-23T17:05:11","slug":"etape-4-comment-changer-les-protocoles-de-synchronisation-pour-ameliorer-la-fertilite","status":"publish","type":"training","link":"https:\/\/www.rumexperts.vet\/en\/training\/etape-4-comment-changer-les-protocoles-de-synchronisation-pour-ameliorer-la-fertilite","title":{"rendered":"Etape 4 : comment changer les protocoles de synchronisation pour am\u00e9liorer la fertilit\u00e9 ?"},"content":{"rendered":"<div class=\"fusion-fullwidth fullwidth-box fusion-builder-row-1 fusion-flex-container has-pattern-background has-mask-background nonhundred-percent-fullwidth non-hundred-percent-height-scrolling\" style=\"--awb-border-radius-top-left:0px;--awb-border-radius-top-right:0px;--awb-border-radius-bottom-right:0px;--awb-border-radius-bottom-left:0px;--awb-flex-wrap:wrap;\" ><div class=\"fusion-builder-row fusion-row fusion-flex-align-items-flex-start fusion-flex-content-wrap\" style=\"max-width:1248px;margin-left: calc(-4% \/ 2 );margin-right: calc(-4% \/ 2 );\"><div class=\"fusion-layout-column fusion_builder_column fusion-builder-column-0 fusion_builder_column_1_1 1_1 fusion-flex-column\" style=\"--awb-bg-size:cover;--awb-width-large:100%;--awb-margin-top-large:0px;--awb-spacing-right-large:1.92%;--awb-margin-bottom-large:20px;--awb-spacing-left-large:1.92%;--awb-width-medium:100%;--awb-order-medium:0;--awb-spacing-right-medium:1.92%;--awb-spacing-left-medium:1.92%;--awb-width-small:100%;--awb-order-small:0;--awb-spacing-right-small:1.92%;--awb-spacing-left-small:1.92%;\"><div class=\"fusion-column-wrapper fusion-column-has-shadow fusion-flex-justify-content-flex-start fusion-content-layout-column\"><div class=\"fusion-text fusion-text-1\"><p>REFERENCE\u00a0: Fricke PM et MC Wiltbank. The implications of spontaneous versus synchronized ovulations on the reproductive performance of lactating dairy cow. J. Dairy Sci. 2022, 105:4679\u20134689 <a href=\"https:\/\/doi.org\/10.3168\/jds.2021-21431\">https:\/\/doi.org\/10.3168\/jds.2021-21431<\/a><\/p>\n<p>Mis au point il y a 25 ans, le protocole hormonal de synchronisation Ovsynch n\u2019a pas contribu\u00e9 \u00e0 augment\u00e9 la fertilit\u00e9 (37 \u00e0 38 %), comparaison faite au % de gestation obtenu apr\u00e8s une IA r\u00e9alis\u00e9e apr\u00e8s d\u00e9tection de l\u2019\u0153strus (39%). Il a cependant am\u00e9lior\u00e9 la f\u00e9condit\u00e9 en r\u00e9duisant la p\u00e9riode d\u2019attente (54 vs 83 jours).<\/p>\n<p>Ce protocole a donc fait l\u2019objet de diverses modifications pour<\/p>\n<ul>\n<li>faire co\u00efncider le d\u00e9but de l\u2019Ovsynch avec le stade optimal du cycle \u00e0 savoir les jours 6 et 7 (protocole Presynch). R\u00e9alis\u00e9e entre le jour 1 et 4 du cycle, la 1<sup>\u00e8re<\/sup> injection de GnRH n\u2019induit pas syst\u00e9matiquement l\u2019ovulation du follicule dominant pr\u00e9sent. Inject\u00e9e apr\u00e8s le 13<sup>\u00e8me<\/sup> jour, elle s\u2019accompagne d\u2019une ovulation pr\u00e9matur\u00e9e. Dans l\u2019un et l\u2019autre cas, on observe une diminution de la fertilit\u00e9.\n<ol>\n<li>Le protocole Presynch (double injection d\u2019une PGF2a \u00e0 14 jours d\u2019intervalle, le protocole Ovsynch d\u00e9butant 12 jours apr\u00e8s la 2<sup>\u00e8me<\/sup> injection de PGF2a) suivi du protocole Ovsynch s\u2019accompagne d\u2019une augmentation de la fertilit\u00e9 (44 vs 31 % de gestation lors d\u2019IA realis\u00e9e apr\u00e8s d\u00e9tection de l\u2019oestrus). Ce protocole Presynch contribue cependant \u00e0 augmenter la p\u00e9riode d\u2019attente (98 vs 80 jours) tout en en r\u00e9duisant la disparit\u00e9 (95 \u00e0 101 vs 60 \u00e0 140).<\/li>\n<li>Le double protocole Ovsynch\u00a0: il a pour avantage de mieux synchroniser la croissance folliculaire voire de l\u2019induire chez des vaches en anoestrus. L\u2019augmentation du % de gestation observ\u00e9 par rapport \u00e0 un protocole de type Presynch (50 vs 42 %) concerne cependant davantage les primipares que les pluripares, ces derni\u00e8res pr\u00e9sentant une moins bonne lut\u00e9olyse suite \u00e0 l\u2019injection de la PGF2a. .<\/li>\n<\/ol>\n<\/li>\n<li>Assurer une meilleure croissance folliculaire suite \u00e0 l\u2019ovulation induite par la 1<sup>\u00e8re<\/sup> injection de GnRH de l\u2019Ovsynch\u00a0: l\u2019addition d\u2019un traitement de progest\u00e9rone durant 5 \u00e0 7 jours contribue \u00e0 am\u00e9liorer la fertilit\u00e9 tout comme le d\u00e9veloppement d\u2019un corps jaune accessoire suite \u00e0 l\u2019ovulation du follicule dominant induite par la 1<sup>\u00e8re<\/sup> injection de la GnRH.<\/li>\n<li>Assurer une concentration aussi faible que possible en progest\u00e9rone durant l\u2019\u0153strus. Pour ce faire une double injection de PGF2a \u00e0 24 heures d\u2019intervalle a \u00e9t\u00e9 recommand\u00e9e.<\/li>\n<\/ul>\n<p>Ces modifications (Presynch et double Ovsynch) du protocole Ovsynch se sont accompagn\u00e9es d\u2019une augmentation de la fertilit\u00e9 (40 \u00e0 60 % de gestation vs\u00a0 31 \u00e0 49 % de gestation lors d\u2019IA sur \u0153strus d\u00e9tect\u00e9) comparaison fait \u00e0 un protocole Ovsynch (37 et 38 % de gestation vs\u00a0 39 de gestation lors d\u2019IA sur \u0153strus d\u00e9tect\u00e9).<\/p>\n<p>Pour en savoir plus sur les protocoles de synchronisation, connectez-vous sur la cha\u00eene Youtube de Christian Hanzen\u00a0: <a href=\"https:\/\/www.youtube.com\/@christianhanzen8109\/videos\">https:\/\/www.youtube.com\/@christianhanzen8109\/videos<\/a><\/p>\n<\/div><div class=\"fusion-image-element \" style=\"--awb-caption-title-font-family:var(--h2_typography-font-family);--awb-caption-title-font-weight:var(--h2_typography-font-weight);--awb-caption-title-font-style:var(--h2_typography-font-style);--awb-caption-title-size:var(--h2_typography-font-size);--awb-caption-title-transform:var(--h2_typography-text-transform);--awb-caption-title-line-height:var(--h2_typography-line-height);--awb-caption-title-letter-spacing:var(--h2_typography-letter-spacing);\"><span class=\" fusion-imageframe imageframe-none imageframe-1 hover-type-none\"><img decoding=\"async\" width=\"713\" height=\"300\" title=\"Ovsynch principe\" src=\"https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2024\/03\/Ovsynch-principe.jpg\" data-orig-src=\"https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2024\/03\/Ovsynch-principe.jpg\" alt class=\"lazyload img-responsive wp-image-2830\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%27713%27%20height%3D%27300%27%20viewBox%3D%270%200%20713%20300%27%3E%3Crect%20width%3D%27713%27%20height%3D%27300%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2024\/03\/Ovsynch-principe-200x84.jpg 200w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2024\/03\/Ovsynch-principe-400x168.jpg 400w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2024\/03\/Ovsynch-principe-600x252.jpg 600w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2024\/03\/Ovsynch-principe.jpg 713w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 640px) 100vw, 713px\" \/><\/span><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":2829,"template":"","keyword":[],"theme":[142,59],"class_list":["post-2828","training","type-training","status-publish","has-post-thumbnail","hentry","theme-production-laitiere","theme-reproduction-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/training\/2828","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/training"}],"about":[{"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/types\/training"}],"author":[{"embeddable":true,"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/users\/20"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/media\/2829"}],"wp:attachment":[{"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/media?parent=2828"}],"wp:term":[{"taxonomy":"keyword","embeddable":true,"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/keyword?post=2828"},{"taxonomy":"theme","embeddable":true,"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/theme?post=2828"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}