{"id":2448,"date":"2023-11-29T08:39:11","date_gmt":"2023-11-29T07:39:11","guid":{"rendered":"https:\/\/www.rumexperts.vet\/?post_type=training&#038;p=2448"},"modified":"2024-03-16T08:53:50","modified_gmt":"2024-03-16T07:53:50","slug":"lhcg-ne-pensez-pas-y-trouver-la-solution-pour-augmenter-les-de-gestation","status":"publish","type":"training","link":"https:\/\/www.rumexperts.vet\/en\/training\/lhcg-ne-pensez-pas-y-trouver-la-solution-pour-augmenter-les-de-gestation","title":{"rendered":"L\u2019hCG : NE PENSEZ PAS Y TROUVER LA SOLUTION POUR AUGMENTER LES % DE GESTATION"},"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>CONTEXTE<\/p>\n<p>REFERENCE : Cunha TO et Martins JPN. Effects of human chorionic gonadotropin on follicular and luteal dynamics and fertility in cattle. J. Dairy Sci. 105:8401\u20138410 https:\/\/doi.org\/10.3168\/jds.2022-21991.<\/p>\n<p>En 1927, Ascheim et Zondek observe que l\u2019urine de femme enceinte renferme une substance capable d\u2019induire chez la souris\u00a0 la maturation et la lut\u00e9inisation des follicules. L\u2019hCG (Human Chorionic gonadotropin) plus connue sous le nom commercial de Chorulon est tout comme la FSH et la LH une glycoprot\u00e9ine dont la sous-unit\u00e9 \u03b2 pr\u00e9sente 80 \u00e0 85 % d\u2019homologie avec la LH ce qui la rend capable de se fixer \u00e0 ses r\u00e9cepteurs et d\u2019avoir une demi-vie plus longue (22.8 \u00b1 2.3 h vs 0.4 \u00b1 0.2 h). Une fois inject\u00e9e, La concentration plasmatique de l\u2019hCG augmente 2 heures apr\u00e8s son injection, pr\u00e9sente une concentration maximale au bout de 4 heures et durant 4 \u00e0 12 heures et retourne \u00e0 ue concentration minimale au bout de 72 heures. Par comparaison, le pic naturel de LH a une dur\u00e9e de 10 heures et celui induit par induit par l\u2019injection de la GnRH dure 5 heures.<\/p>\n<p>Inject\u00e9e entre les jours 6 et 13 du cycle, l\u2019hCG (3.000 UI) contribue \u00e0 augmenter la concentration de la progest\u00e9rone soit en induisant l\u2019ovulation du follicule pr\u00e9sente et la formation d\u2019un corps jaune accessoire, soit par un effet direct sur le corps jaune pr\u00e9sent. Cette injection s\u2019accompagne d\u2019une augmentation de la dur\u00e9e du cycle, du fait que la 2<sup>\u00e8me<\/sup> vague appara\u00eet plus pr\u00e9cocement mais s\u2019atr\u00e9sie plus rapidement, induisant l\u2019apparition d\u2019une 3<sup>\u00e8me<\/sup> vague.<\/p>\n<p>A la diff\u00e9rence de la GnRH, l\u2019hCG agit ind\u00e9pendamment de l\u2019hypophyse et donc ind\u00e9pendamment de la concentration en progest\u00e9rone, connue pour son effet retro-actif n\u00e9gatif sur la LH. La dose de 2.500 UI a \u00e9t\u00e9 recommand\u00e9e pour l\u2019obtention d\u2019un effet ovulatoire.<\/p>\n<p>Le remplacement de la 1<sup>\u00e8re<\/sup> injection de GnRH par l\u2019hCG dans les protocoles de type Ovsynch n\u2019a pas eu les effets escompt\u00e9s. L\u2019hypoth\u00e8se d\u2019une demi-vie plus longue de l\u2019HCG et donc d\u2019un effet n\u00e9gatif sur la qualit\u00e9 de l\u2019ovocyte a \u00e9t\u00e9 avanc\u00e9e. Elle devrait \u00eatre confirm\u00e9e. De m\u00eame son administration \u00e0 la dose de 1000 UI 2 \u00e0 7 jours apr\u00e8s l\u2019ins\u00e9mination s\u2019accompagnerait d\u2019une r\u00e9duction du pourcentage de vaches pluripares d\u00e9tect\u00e9es en chaleurs.<\/p>\n<p>La progest\u00e9ron\u00e9mie conditionne le d\u00e9veloppement de l\u2019embryon. L\u2019injection d\u2019hCG 5 jours apr\u00e8s une IA augmente le % de gestation chez les primipares. Ce type de protocole \u00e0 base d\u2019HCG ou de GnRH n\u2019aurait un effet que sur les vaches plus \u00e0 risque d\u2019infertilit\u00e9.<\/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=\"800\" height=\"447\" title=\"Cunha 2022 hCG synthese\" src=\"https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-scaled.jpg\" data-orig-src=\"https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-800x447.jpg\" alt class=\"lazyload img-responsive wp-image-2450\" srcset=\"data:image\/svg+xml,%3Csvg%20xmlns%3D%27http%3A%2F%2Fwww.w3.org%2F2000%2Fsvg%27%20width%3D%271900%27%20height%3D%271062%27%20viewBox%3D%270%200%201900%201062%27%3E%3Crect%20width%3D%271900%27%20height%3D%271062%27%20fill-opacity%3D%220%22%2F%3E%3C%2Fsvg%3E\" data-srcset=\"https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-200x112.jpg 200w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-400x224.jpg 400w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-600x335.jpg 600w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-800x447.jpg 800w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-1200x671.jpg 1200w, https:\/\/www.rumexperts.vet\/wp-content\/uploads\/2023\/11\/Cunha-2022-hCG-synthese-scaled.jpg 1900w\" data-sizes=\"auto\" data-orig-sizes=\"(max-width: 640px) 100vw, 1200px\" \/><\/span><\/div><\/div><\/div><\/div><\/div>\n","protected":false},"excerpt":{"rendered":"","protected":false},"author":20,"featured_media":2449,"template":"","keyword":[],"theme":[59],"class_list":["post-2448","training","type-training","status-publish","has-post-thumbnail","hentry","theme-reproduction-en"],"acf":[],"_links":{"self":[{"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/training\/2448","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\/2449"}],"wp:attachment":[{"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/media?parent=2448"}],"wp:term":[{"taxonomy":"keyword","embeddable":true,"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/keyword?post=2448"},{"taxonomy":"theme","embeddable":true,"href":"https:\/\/www.rumexperts.vet\/en\/wp-json\/wp\/v2\/theme?post=2448"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}