Presynchronization by induction of a largest follicle using a progesterone device in GnRH-based-ovulation synchronization protocol in crossbred dairy cows

Silva, L. A. C. L; Simões, L. M. S.; Bottino, M. P.; Santos, Ana Paula; Santos, Guilherme Pinheiro dos; Martinez, I. Y. H.; Souza, José Camisão de; Baruselli, Pietro Sampaio; Sales, J. N. S.

doi:10.1016/j.theriogenology.2018.04.030

Cited by 8 publications

(6 citation statements)

References 35 publications

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“…Another approach of presynchronization using a progesterone pretreatment combined with GnRH ( Figure 14) was shown to be as efficacious as the Double-Ovsynch protocol in terms of pregnancy per AI at 30 and 60 days (Silva et al, 2018).…”

Section: Synchronization and Tai For Dairy Heifersmentioning

confidence: 99%

Synchronization of Estrus and Ovulation in Dairy Cattle

Tibary¹,

Patino²,

Ciccarelli³

2019

SPERMOVA

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Development of bovine estrus synchronization protocols started in the 1970's. The aim of these protocols has changed progressively from synchronizing estrus to synchronizing ovulation with main goal of performing insemination without heat detection (Timed artificial insemination). The present paper discusses the physiology behind development of these synchronization protocols and reviews of the main protocols used nowadays in dairy herd reproductive management. RESUMENEl desarrollo de los protocolos de sincronización del celo en bovinos comenzó en la década de 1970. El objetivo de estos protocolos ha cambiado progresivamente de la sincronización del celo a la sincronización de la ovulación con el objetivo de realizar la inseminación sin detección de celo (inseminación artificial a tiempo fijo). El presente artículo discute la fisiología detrás del desarrollo de estos protocolos de sincronización y las revisiones de los principales protocolos utilizados hoy en día en el manejo reproductivo del hato lechero.

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Section: Synchronization and Tai For Dairy Heifersmentioning

confidence: 99%

Synchronization of Estrus and Ovulation in Dairy Cattle

Tibary¹,

Patino²,

Ciccarelli³

2019

SPERMOVA

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“…Recently our research group developed a presynchronization protocol using a P4 sustained-release vaginal device (Silva et al, 2018) to induce a persistent dominant follicle to increase the response to the first GnRH of the Ovsynch protocol. In the experiment, 440 dairy cows (345 Holstein-Zebu crossbreds and 95 Holsteins) were randomly assigned to Double Ovsynch (Double-Ov; Souza et al, 2008) and P4synch.…”

Section: Strategies To Increase Response To the First Gnrh Of The Ovsmentioning

confidence: 99%

“…c) Synchronization: presence of a follicle >12 mm. The P4synch protocol consisted of insertion of an intravaginal P4 device 10 days prior to the initiation of the Ovsynch protocol (D-10) and withdrawing the device on the day of PGF2α administration of the Ovsynch (D7) protocol (Silva et al, 2018). Figure 2.…”

Section: Strategies To Increase Response To the First Gnrh Of The Ovsmentioning

confidence: 99%

“…Figure 2. Effect of the presynchronization protocol (Double-Ov and P4synch) on the P/AI at 30 and 60 days and pregnancy loss (P > 0.05 ) in lactating crossbred dairy cows (Silva et al, 2018). 37.4 (67/179) 42.4 (72/170) 0.35 Abbreviations: LF, largest follicle; CL, Corpus Luteum.…”

Section: Strategies To Increase Response To the First Gnrh Of The Ovsmentioning

confidence: 99%

“…However, some limitations (long protocol of 28 days and many animal handling) prevent extensive use of this protocol. In addition, to stimulating LH pulsatility, P4 (single intravaginal P4 devices) may be an alternative to induce the formation of large follicles that responds to the first GnRH of the Ovsynch protocol (Silva et al, 2018). Cows with P4 devices develop follicular persistence due to absence of pre-ovulatory peak of LH and maintenance of sub luteal concentrations of progesterone (Cerri et al, 2009).…”

Section: Introductionmentioning

confidence: 99%

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Pre-TAI protocol strategies to increase reproductive efficiency in beef and dairy cows

Sales¹,

Simões²,

Orlandi³

et al. 2019

Anim Reprod

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Ovulation synchronization protocols are well established in beef and dairy cows. However, the protocol response rate is around 70-90%. In beef cows, factors such as inadequate nutrition and calf presence negatively impact the response of progesterone (P4)/estradiol-based ovulation synchronization protocols by interfering with GnRH release and consequently reducing LH pulsatility and final follicular development. In dairy cows, protocols based on GnRH and prostaglandin (Ovsynch) are the most widely used in the world. However, the efficiency of Ovsynch is dependent on the presence of a large follicle at the time of administration of the first GnRH. In these ovulation synchronization protocols, pre-synchronization protocols (Prostaglandins, Double Ovsynch and P4synch) are usually attempted in an effort to increase responses. Thus, the objective of this review was to discuss pre-ovulation synchronization strategies (administration of injectable P4 or energetic/protein supplementation or presynchronization with intra-vaginal progesterone devices) aiming to increase the LH pulsatility in beef cows or induce the formation of a GnRH-responsive follicle at the beginning of the Ovsynch protocol in dairy cows.

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