HORMONAL CONTROL of THE ESTROUS CYCLE, FOLLICULAR DEVELOPMENT and OVULATION IN DAIRY COWS

Öz

Reproduction is one of the most important factor for sustainability and productivity in dairy farm management. Depending on the capacity of the herds, various approaches are used in management. These are the visual observation of the sexual activities, adaptation of sensory technologies, endocrine measurements, and hormone interventions. In the last fifty years, managery of the herds had an effort to minimize the losses due to human-caused. Thus, the hormone applications, which are cheaper than the other technological approaches, are preferred by the farm managements. Reproductive hormones, such as prostaglandin-F2-alpha (PGF2α) analogues, gonadotrophin releasing hormone (GnRH) analogues, progesterone, estradiol (E2), pregnant mare serum gonadotropin (PMSG), and human chorionic gonadotropin (hCG) have been widely used in veterinary medicine. By use of these reproductive hormones, the estrous cycle, follicular development, and ovulation can be synchronized in a schedule. The most commonly used programs are targeted insemination program, modified targeted insemination program, ov-synch, ov-synch with presynchronization, ov-synch supplemented with progesterone, and double (double) ov-synch program.

Anahtar Kelimeler

• Cow
• Reproduction
• Hormonal control
• Sexual synchronization
• Reproductive hormones

Proje Numarası

Bulunmamaktadır

SÜTÇÜ İNEKLERDE ÖSTRUS SİKLUSUNUN, FOLİKÜLER GELİŞİMİN ve OVULASYONUN HORMONAL KONTROLÜ

Öz

Süt sığırcılığı işletmelerinde sürdürülebilir üretim ve verimlilik için en önemli faktörlerden biri döl verimidir. İşletme ölçeğine bağlı olarak, verimliliği artırabilmek için çeşitli yaklaşımlar kullanılmaktadır. Bunlar, seksüel aktivitenin gözlenmesi, sensör teknolojilerinin kullanımı, endokrin ölçümler ve hormon müdahaleleridir. Son elli yıl içinde, işletmelerdeki hayvan sayısının artışı, insan faktöründen kaynaklı kayıpları artırmıştır. Bu nedenle, sürülerde üremenin denetlenmesinde diğer teknolojik yaklaşımlara göre daha ucuz olan hormon uygulamaları yaygın hale gelmiştir. Bu amaçla prostaglandin F2-alfa (PGF2α) analogları, gonadotropin salıcı hormon (GnRH) analogları, progesteron, östradiol (E2), gebe kısrak serum gonadotropini (PMSG), insan koriyonik gonadotropini (hCG) gibi hormonlar veteriner hekimlikte geniş bir uygulama alanı bulmuştur. Üreme hormonlarının analog formlarının kullanımıyla çeşitli östrusun, foliküler gelişimin ve ovulasyonun senkronize edildiği programlar geliştirilmiştir. Bunların en yaygın kullanılanları, hedeflenmiş tohumlama programı, modifiye edilmiş hedef tohumlama programı, ov-synch, presenkronizasyon uygulanan ov-synch, progesteronla desteklenmiş ov-synch, double (çift) ov-synch programlarıdır.

Anahtar Kelimeler

• İnek
• Döl verimi
• Hormonal kontrol
• seksüel senkronizasyon
• Üreme hormonları

Destekleyen Kurum

Bulunmamaktadır

Proje Numarası

Bulunmamaktadır

Teşekkür

Bulunmamaktadır

Kaynakça

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