Decreasing the interval between GnRH and PGF2α from 7 to 5 days and lengthening proestrus increases timed-AI pregnancy rates in beef cows

Bridges, G.A.; Helser, L.A.; Grum, D. E.; Mussard, M.L.; Gasser, C L; Day, M. L.

doi:10.1016/j.theriogenology.2007.12.011

Cited by 192 publications

(165 citation statements)

References 17 publications

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“…Bridges et al (2008) compared a 7-day CO-Synch protocol plus progestin device with FTAI at 60 h and a 5-day CO-Synch protocol plus a progestin device with FTAI at 72 h in postpartum beef cows. In that study, P/AI was 11% higher with the 5-day protocol.…”

Section: The 5-day Co-synch Protocol In Beef Cattlementioning

confidence: 99%

Synchronization of ovulation and fixed-time artificial insemination in beef cattle

Bó

Baruselli²

2014

Animal

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The main objective of the implementation of artificial insemination (AI) in cattle is to produce a sustained genetic progress in the herd. Although AI is an old reproductive biotechnology, its widespread implementation is very recent and is mainly because of the use of protocols that allows AI without oestrus detection, commonly called fixed-time artificial insemination (FTAI). The development of FTAI protocols also allowed the application of AI in larger, extensively managed herds and especially in suckled cows instead of restricting the breeding programmes to the heifers. Fixed-time AI treatments are widely used in South America, with about 3 000 000 cows inseminated in the last season in Argentina and about 8 000 000 in Brazil. The objective of this review is to present and describe the various treatments available and some of the factors that may affect pregnancy rates in beef cattle.

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Section: The 5-day Co-synch Protocol In Beef Cattlementioning

confidence: 99%

Synchronization of ovulation and fixed-time artificial insemination in beef cattle

Bó

Baruselli²

2014

Animal

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“…Previous studies have shown the effectiveness of short protocols that use a GnRH treatment at the day of insertion of the progesterone device (BRIDGES et al, 2008;SANTOS et al, 2010). Nevertheless, to our knowledge, this is the first report evaluating the efficiency of a short 5 d TAI protocol in buffaloes that have not been administered GnRH or EB at the beginning of the protocol.…”

Section: Introductionmentioning

confidence: 87%

Use of a five-day progesterone-based timed artificial insemination protocol for dairy water buffaloes

Pfeifer¹,

Castro²

2017

SCA

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The objective of this study was to determine the effect of a short five-day (5 d) progesterone-based timed artificial insemination (TAI) protocol on the time of ovulation and fertility in dairy water buffaloes. In experiment 1, 30 dairy buffaloes were subjected to one of two estrous synchronization protocols. Females in the control group (n=17) were administered 2 mg of estradiol benzoate (EB), and an intravaginal progesterone-releasing device (CIDR) was inserted on day -12. On day -3, CIDR inserts were removed and all cows were treated with 150 μg of D-cloprostenol (a PGF2α-analogue). Fortyeight hours after CIDR removal, all cows received 100 µg of gonadotropin-releasing hormone (GnRH). Females assigned to the short 5 d group (n=13) received treatment similar to the control group, except that the CIDR device was inserted on day -8, and the EB treatment was eliminated. In experiment 2, 51 dairy buffaloes were separated into control (n=27) and short 5 d (n=24) groups that received the same treatment as described for cows in experiment 1, except that all females were inseminated 16 to 18 h after GnRH injection. The use of a short 5 d progesterone-based TAI protocol with or without treatment with EB on day 0 did not affect the time of ovulation and pregnancy per artificial insemination in lactating water buffaloes. Thus, we suggest that the short 5 d TAI protocol may be successfully used as an alternative to induce ovulation in dairy buffaloes, with the particular advantages of avoiding EB treatment and a shorter interval from the beginning of the protocol to TAI.

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“…El clima de la región es semiseco, con una temperatura media anual de 17.4 °C y precipitación media de 526 mm. the inclusion of progesterone (10)(11)(12) . The combination with progesterone has favored the PR up by 10 percentage points (8) , which is related to a better environment for the ovulatory follicle development (13) ; in addition, the incorporation of progesterone can induce a fertile estrus in females that are in anoestrus or in the transition phase of the anoestrus to cyclicity (14) .…”

Section: Manejo Del Hatomentioning

confidence: 99%

“…Within the modifications that have been made to optimize the basic Ovsynch protocol it stresses Dentro de las modificaciones que se han hecho al programa básico de Ovsynch para optimizarlo destaca la inclusión de progesterona (10)(11)(12) . La combinación con progesterona ha favorecido la TG hasta en diez puntos porcentuales (8) , lo cual se relaciona con un mejor ambiente para el desarrollo del folículo ovulatorio (13) ; además, la incorporación de progesterona puede inducir un estro fértil en hembras que están en anestro o en la fase de transición del anestro a la ciclicidad (14) .…”

Section: Introductionunclassified

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Gestación en vacas lecheras con dos protocolos de sincronización de la ovulación e inseminación a tiempo fijo

Domínguez

Flores

Ordaz

et al. 2015

Rev. Mex. Cienc. Pecu.

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RESUMENSe comparó la tasa de gestación (TG) en vacas lecheras inseminadas a tiempo fijo mediante dos protocolos. El día 32 posparto, 275 vacas recibieron dos inyecciones de PGF2 con intervalo de 14 días. Doce días después de la segunda inyección, se asignaron a los siguientes tratamientos: 1) Ovsynch (n=144) recibieron GnRH; siete días después PGF2; 56 h más tarde GnRH y se inseminaron 16 h después 2) PRID5d (n=131) recibieron GnRH y un dispositivo intravaginal liberador de progesterona durante cinco días; al retirar el dispositivo, se aplicaron dos inyecciones de PGF2 con intervalo de 24 h; 56 h posterior al retiro del dispositivo, se aplicó GnRH y se inseminaron 16 h después. La gestación se diagnosticó por palpación rectal el día 45 posinseminación. Se comparó la TG mediante regresión logística. Las variables independientes fueron: tratamiento (Ovsynch vs PRID5d), producción láctea (40 vs >40 kg), técnico inseminador (1 vs 2), tipo de puerperio (normal vs anormal), partos previos (primíparas vs multíparas) y si mostraron estro en la presincronización. La TG fue similar (P>0.1) entre los tratamientos (27 vs 21 %; Ovsynch y PRID5d, respectivamente). Ninguna de las otras variables independientes afectó la TG (P>0.1); no hubo efecto de la interacción de dichas variables con el tratamiento en la TG (P>0.1). Se concluye que la TG fue similar entre las vacas inseminadas con un protocolo Ovsynch o mediante un protocolo Ovsynch modificado que incluyó 5 días de progesterona y la reducción de 7 a 5 días entre la inyección de GnRH y la PGF2.PALABRAS CLAVE: Ovsynch, Progesterona, Fertilidad, Vacas lecheras. ABSTRACTThe objective was to compare the pregnancy rate (PR) between two timed AI protocols in dairy cattle. Two hundred seventy-five (275) cows were presynchronized with PGF2 given 14 d apart beginning at d 32 postpartum; 12 d after second PGF2, cows were assigned to two treatments: 1) Ovsynch (n=144) received GnRH, followed 7 d later by PGF2 and then GnRH 56 h after PGF2 and cows were inseminated 16 h later 2) PRID5d (n=131), received GnRH and a progesterone-releasing intravaginal device, which remained in place 5 d. Cows received an injection of PGF2 at the time of progesterone device removal and a second injection of PGF2 24 h later. At 56 h following progesterone device removal, the next injection of GnRH was given and cows were inseminated 16 h later. Pregnancy diagnosis was performed 45 d after AI by transrectal palpation. PR was compared by logistic regression analysis. Independent variables were: treatment (Ovsynch vs PRID5d), milk yield (40 vs >40 kg), technician (1 vs 2), puerperium (normal vs abnormal), parity (primiparous vs multiparous) and standing estrus during presynchronization. PR was similar (P>0.1) between treatments (27 vs 21 %; Ovsynch and PRID5d, respectively). There was no effect of the other independent variables on PR. The interaction of these variables with the treatment did not affect PR (P>0.1). In conclusion, PR was similar in dairy cows inseminated by an Ovsynch protocol or t...

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Decreasing the interval between GnRH and PGF2α from 7 to 5 days and lengthening proestrus increases timed-AI pregnancy rates in beef cows

Cited by 192 publications

References 17 publications

Synchronization of ovulation and fixed-time artificial insemination in beef cattle

Synchronization of ovulation and fixed-time artificial insemination in beef cattle

Use of a five-day progesterone-based timed artificial insemination protocol for dairy water buffaloes

Gestación en vacas lecheras con dos protocolos de sincronización de la ovulación e inseminación a tiempo fijo

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