{"id":2794,"date":"2024-03-23T08:39:30","date_gmt":"2024-03-23T07:39:30","guid":{"rendered":"https:\/\/www.rumexperts.vet\/?post_type=training&p=2794"},"modified":"2024-03-23T08:39:30","modified_gmt":"2024-03-23T07:39:30","slug":"predire-le-delai-de-loestrus-en-denombrant-les-follicules-de-plus-de-10-mm","status":"publish","type":"training","link":"https:\/\/www.rumexperts.vet\/en\/training\/predire-le-delai-de-loestrus-en-denombrant-les-follicules-de-plus-de-10-mm","title":{"rendered":"Pr\u00e9dire le d\u00e9lai de l’oestrus en d\u00e9nombrant les follicules de plus de 10 mm"},"content":{"rendered":"

REFERENCE\u00a0: Miura R et al. Prediction of the spontaneous estrus expression period based 2 on large (\u226510 mm) follicle numbers in lactating Holstein dairy 3 cows. Animals 2023,12.<\/p>\n

CONTEXTE<\/p>\n

80 % des vaches laiti\u00e8res pr\u00e9sentent 2 vagues de croissance folliculaire au cours du cycle. Dans la majorit\u00e9 des cas, il n\u2019y a qu\u2019un seul follicule qui coexiste avec un corps jaune au cours de sa premi\u00e8re moiti\u00e9. Au cours de la deuxi\u00e8me moiti\u00e9 on peut identifier la pr\u00e9sence de deux follicules, le premier est le follicule de la premi\u00e8re vague en train de s\u2019atr\u00e9sier et le second celui de la deuxi\u00e8me vague en train de se d\u00e9velopper.\u00a0 Ces caract\u00e9ristiques s\u2019observent en pr\u00e9sence d\u2019un corps jaune de diam\u00e8tre> 20 mm.<\/p>\n

ETUDE<\/p>\n

Les auteurs ont r\u00e9alis\u00e9 un suivi \u00e9chographique de 146 vaches laiti\u00e8res de race Holstein en stabulation entrav\u00e9e\u00a0 (170 jours de lactation en moyenne produisant en moyennne 35 litres de lait) au cours des jours pr\u00e9c\u00e9dant ou suivant un \u0153strus.<\/p>\n

Le d\u00e9lai d\u2019apparition de l\u2019\u0153strus s\u2019est av\u00e9r\u00e9 \u00eatre significativement plus court apr\u00e8s identification d\u2019un seul follicule de diam\u00e8tre > 10 mm et d\u2019un corps jaune de >20 mm (7,2 jours) qu\u2019apr\u00e8s l\u2019identification de deux follicules et d\u2019un corps jaune (12,4 jours). Le num\u00e9ro de lactation et la production laiti\u00e8re n\u2019ont pas eu d\u2019effets sur ces d\u00e9lais.<\/p>\n

CONCLUSION<\/p>\n

L\u2019\u00e9chographie trouve ici un champ d\u2019application compl\u00e9mentaire qui est de nature \u00e0 renforcer la qualit\u00e9 de la d\u00e9tection de l\u2019\u0153strus en stabulation entrav\u00e9e.<\/p>\n<\/div>

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