| This study investigated the efficiency of the previously used controlled internal drug release (CIDR) stored for 30 days before reusing. In the first experiment, twenty seven Holstein cows at the day of estrus (day 0) received either no treatment (control), new or reused CIDR and blood samples were collected at day 0, 1, 3 and 7. At day 1 and 3, serum progesterone concentration in cows receiv...

La situación económica mundial requiere de prácticas manejo eficaces para mejorar la rentabilidad los establecimientos producción leche, especialmente, en ganadería trópico. El objetivo es demostrar el efecto eficiencia reproductiva mediante uso dos protocolos (eCG y Ovsynch) IATF ganado bovino metodología fue tratamientos, con un diseño bloque completamente al azar; se aplicaron bases Ovsynch ...

Protokol ovulation synchronization (ovsynch) dirancang untuk dapat menyerentakkan ovulasi, sehingga inseminasi buatan (IB) dilakukan secara repat waktu/fixed time pada sapi dara tanpa diperlukan deteksi estrus. Namun, efektivitas dari ovsynch berbasis progesteron intravginal melalui pengamatan dinamika ovarium bangsa yang berbeda, Sapi Friesian Holstein (FH) dan persilangannya dengan Belgian Bl...

Previous research indicates that high blood urea nitrogen (BUN) concentrations are associated with decreased fertility in lactating dairy cows.This experiment was done to evaluate the effects of equine chorionic gonadotropin (eCG) administration (with or without eCG) on fertility of lactating dairy cows with different levels of BUN subjected to fixed-time artificial insemination (FTAI).Ovulatio...

This study examined the influence of a GnRH agonist containing either 450 or 750 microg of deslorelin in an implant form or a gonadorelin injection (control) to induce ovulation in the Ovsynch protocol on pregnancy rates (PR), embryonic loss, and ovarian function in 593 lactating Holstein cows. Cows were given two injections of PGF2alpha 14 days apart, followed 14 days later by the Ovsynch prot...

Beef cows (n = 473) from two locations were stratified by breed, postpartum interval, age, and AI sire and were randomly allotted to one of four treatments for synchronization of ovulation. Ovulation synchronization protocols included the Ovsynch protocol with (n = 114) or without (n = 123) 48-h calf removal from d 7 to 9 (d 0 = 1st GnRH injection) or the CO-Synch protocol with (n = 119) or wit...

A long standing goal of reproductive physiologists was to develop a hormonal synchronization program that could overcome the problems and limitations associated with visual detection of estrus in dairy cattle. This goal was realized in 1995 with the publication of a hormonal synchronization protocol that combined GnRH and PGF2α to control ovarian physiology and is now commonly referred to as th...