Administration of GnRH on the day of fixed-time artificial insemination (FTAI) and melengestrol acetate (MGA) administration after ftai in non-suckling nelore cattle
Abstract:The present study evaluated the effect of administering buserelin acetate (GnRH) at the time of fixedtime artificial insemination (FTAI), along with the effect of oral administration of melengestrol acetate (MGA) after FTAI on conception rates in non-suckling Nelore cattle. In Experiment I, the effect of GnRH application at the time of FTAI was evaluated, as was administration of MGA from the 13 th through the 18 th day following FTAI (D24 to D29 after the initiation of the FTAI protocol). Experiment I was per… Show more
Progesterone (P4) is a key hormone in the reproductive physiology of cattle, playing a crucial role in regulating the estrous cycle and establishing and maintaining the pregnancy. In the context of reproductive efficiency, the use of P4 has been a strategy increasingly used on rural properties to anticipate puberty, increase pregnancy rates and reduce gestational loss. A common application is the administration of P4, often in the form of intravaginal devices or, more recently, with long-acting injectable progesterone. These methods help synchronize ovulation, allowing more precise management of reproductive programs, facilitating the use of artificial insemination, and contributing to genetic improvement. The synchronization of ovulation in beef and dairy cattle allows insemination at a pre-determined time without the need for estrus detection. These treatments increase the number of inseminated animals and, consequently, the number of pregnant animals. Overall, the strategic use of P4 in livestock management serves as a valuable tool for increasing reproductive efficiency, facilitating better control of reproductive cycles, and contributing to increased pregnancy rates and better overall reproductive performance in cattle herds.
Progesterone (P4) is a key hormone in the reproductive physiology of cattle, playing a crucial role in regulating the estrous cycle and establishing and maintaining the pregnancy. In the context of reproductive efficiency, the use of P4 has been a strategy increasingly used on rural properties to anticipate puberty, increase pregnancy rates and reduce gestational loss. A common application is the administration of P4, often in the form of intravaginal devices or, more recently, with long-acting injectable progesterone. These methods help synchronize ovulation, allowing more precise management of reproductive programs, facilitating the use of artificial insemination, and contributing to genetic improvement. The synchronization of ovulation in beef and dairy cattle allows insemination at a pre-determined time without the need for estrus detection. These treatments increase the number of inseminated animals and, consequently, the number of pregnant animals. Overall, the strategic use of P4 in livestock management serves as a valuable tool for increasing reproductive efficiency, facilitating better control of reproductive cycles, and contributing to increased pregnancy rates and better overall reproductive performance in cattle herds.
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