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Synchronization of Estrus in Cattle: A Review

تزامن الشبق في الماشية: مراجعة
Authors: Md Rashadul Islam;

Synchronization of Estrus in Cattle: A Review

Abstract

Le nombre de programmes de synchronisation de l'œstrus est disponible chez les bovins en fonction de l'utilisation de diverses hormones comme la progestérone, la prostaglandine F2a et leurs diverses combinaisons avec d'autres hormones comme l'œstrogène et l'hormone de libération de la gonadotrophine (GnRH). La sélection du protocole de synchronisation de l'œstrus approprié doit être faite sur la base des capacités de gestion et des attentes de l'agriculteur. La synchronisation de l'œstrus peut être réalisée avec l'injection de prostaglandine F2a seule, mais elle doit détection correcte de l'état ovarien des vaches car la prostaglandine F2a n'est active que dans le corps jaune fonctionnel entre 8 et 17 jours du cycle oestral.La progestérone peut réduire la fertilité jusqu'à 14%, mais une exposition à la progestérone de courte durée (moins de 14 jours) est bénéfique.L' ajout de GnRH dans le programme de synchronisation basé sur la progestérone ou la prostaglandine est utile pour plus de synchronisation dans l'oestrus car la GnRH peut être utile pour synchroniser le cycle oestral chez les génisses pubertaires retardées et les vaches post-partum (Post partum anoestrum) et en outre une insémination artificielle unique et chronométrée est possible avec cette méthode.Nouvelles méthodes de synchronisation de l'oestrus dans lesquelles le protocole GnRH-PG est précédé d'un traitement à la progestérone offrant une synchronisation efficace de l'œstrus avec une fertilité élevée.

Se dispone de un número de programas de sincronización del estro en el ganado bovino basados en el uso de varias hormonas como la progesterona, la prostaglandina F2a y sus diversas combinaciones con otras hormonas como el estrógeno y la hormona liberadora de gonadotropina (GnRH). La selección del protocolo de sincronización del estro apropiado debe hacerse sobre la base de las capacidades de manejo y las expectativas del agricultor. La sincronización del estro se puede lograr con la inyección de prostaglandina F2a sola, pero necesita detección adecuada del estado ovárico de las vacas, ya que la prostaglandina F2a está activa solo en el cuerpo lúteo funcional entre los 8 y los 17 días del ciclo estral. La progesterona puede reducir la fertilidad hasta en un 14 por ciento, pero la exposición a la progesterona durante poco tiempo (menos de 14 días) es beneficiosa. La adición de GnRH en el programa de sincronización basado en progesterona o prostaglandina es útil para una mayor sincronía en el estro, ya que la GnRH puede ser útil para sincronizar el ciclo estral en novillas puberales retrasadas y vacas posparto (anoestrum posparto) y, además, es posible una inseminación artificial única y programada con este método. Nuevos métodos de sincronización del estro en los que el protocolo GnRH-PG está precedido por el tratamiento con progesterona que ofrece una sincronización efectiva del estro con alta fertilidad.

Numbers of estrus synchronization programmes are available in cattle based on the use of various hormones like progesterone, prostaglandin F2a and their various combinations with other hormones like estrogen and Gonadotrophin Releasing hormone (GnRH).Selection of appropriate estrus synchronization protocol should be made on the basis of management capabilities and expectations of the farmer.Synchronization of oestrus can be accomplished with the injection of prostaglandin F2a alone, but it needs proper detection of the ovarian status of the cows as prostaglandin F2a is active in only functional corpus luteum in between 8 to 17 days of estrous cycle.Progesterone may reduce fertility up to 14 percent, but short time progesterone exposure (less than 14 days) is beneficial.Addition of GnRH in the Progesterone or Prostaglandin based synchronization programme is helpful for more synchrony in estrus as GnRH may be helpful to synchronize the oestrous cycle in delayed pubertal heifers and post partum cows (Post partum anoestrum) and further a single, timed artificial insemination is possible with this method.New methods of synchronizing estrus in which the GnRH-PG protocol is preceded by progesterone treatment offer effective synchronization of estrus with high fertility.

تتوفر أعداد من برامج تزامن الشبق في الماشية بناءً على استخدام هرمونات مختلفة مثل البروجسترون والبروستاجلاندين F2a ومجموعاتها المختلفة مع هرمونات أخرى مثل هرمون الاستروجين وهرمون إطلاق الغدد التناسلية (GnRH). يجب اختيار بروتوكول تزامن الشبق المناسب على أساس قدرات الإدارة وتوقعات المزارع. يمكن تحقيق تزامن الشبق مع حقن البروستاجلاندين F2a وحده، لكنه يحتاج الكشف السليم عن حالة المبيض للأبقار حيث أن البروستاجلاندين F2a نشط في الجسم الأصفري الوظيفي فقط في الفترة ما بين 8 إلى 17 يومًا من الدورة الودية. قد يقلل البروجسترون من الخصوبة بنسبة تصل إلى 14 في المائة، ولكن التعرض لهرمون البروجسترون لفترة قصيرة (أقل من 14 يومًا) مفيد. إن إضافة GnRH في برنامج المزامنة القائم على البروجسترون أو البروستاجلاندين مفيد لمزيد من التزامن في الشبق حيث قد يكون GnRH مفيدًا في مزامنة الدورة الودية في العجول البلوغية المتأخرة والأبقار بعد الولادة (بعد الجزء اللاإرادي)، كما يمكن إجراء تلقيح اصطناعي واحد موقوت باستخدام هذه الطريقة. طرق جديدة لمزامنة الشبق فيها يسبق بروتوكول GnRH - PG علاج البروجسترون الذي يوفر تزامنًا فعالًا للشبق مع خصوبة عالية.

Keywords

Prostaglandin, Gonadotrophin Hormone, Veterinary medicine, Artificial insemination, Synchronization, SF1-1100, Agricultural and Biological Sciences, Nutritional Strategies for Ruminant Health and Production, Estrus, Pregnancy, Biochemistry, Genetics and Molecular Biology, SF600-1100, Synchronization (alternating current), Genetics, Dairy cattle, Andrology, Biology, Progesterone, Estrous cycle, Life Sciences, Hormone, Estrogen, Livestock Domestication, Computer science, Anoestrus, Animal culture, Estrus synchronization, Channel (broadcasting), FOS: Biological sciences, Genomic Selection in Plant and Animal Breeding, Telecommunications, Medicine, Reproductive Health in Dairy Cattle, Agronomy and Crop Science, Animal science

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selected citations
These citations are derived from selected sources.
This is an alternative to the "Influence" indicator, which also reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Citations provided by BIP!
popularity
This indicator reflects the "current" impact/attention (the "hype") of an article in the research community at large, based on the underlying citation network.
BIP!Popularity provided by BIP!
influence
This indicator reflects the overall/total impact of an article in the research community at large, based on the underlying citation network (diachronically).
BIP!Influence provided by BIP!
impulse
This indicator reflects the initial momentum of an article directly after its publication, based on the underlying citation network.
BIP!Impulse provided by BIP!
20
Top 10%
Top 10%
Average
gold