Luteolysis, progesterone, and pregnancy per insemination after modifying the standard 7-day Ovsynch program in Holstein-Friesian and Holstein cows

Atanasov, B; Dovenski, Toni; Celeska, Irena; Stevenson, Jeffrey S.

doi:10.3168/jds.2020-19922

Cited by 8 publications

(5 citation statements)

References 28 publications

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“…On contrary, when P4 concentrations were ≥1 ng/mL either at Pre-PG or at G1, the cows were classified as cyclic. Incomplete luteal regression was defined to occur when the P4 level was >1 ng/mL at PGF 2α and >0.4 ng/mL at TAI, respectively (14). Although, the pregnancy rate was not the primary focus of the study due to the small number of cows included, the ultrasound pregnancy diagnosis was done at d 21 and d 30 after TAI.…”

Section: Ultrasonographic Examination Blood Collection Cyclic Status ...mentioning

confidence: 99%

“…Thus, the failure of complete CL regression limits the achievement of maximal P/AI (pregnancy per AI) (11). Several strategies have been implemented to prevent incomplete luteal regression: by either increasing the dose of PGF 2α (12) or the frequency of PGF 2α treatment (13), or lengthening the time from G1 to PGF 2α for 1 day (Ovsynch 8) (8,14) during the Ovsynch protocol. However, the results were inconsistent.…”

Section: Introductionmentioning

confidence: 99%

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External Progesterone Supplementation During the Ovsynch Protocol Reduces the Incomplete Luteolysis in Dairy Cows Under Heat Stress

Stojanov,

Atanasov,

Grizelj

et al. 2024

Macedonian Veterinary Review

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The present study aimed to determinate the effect of external progesterone (P4) supplementation on luteolysis in cows under heat stress. Forty-eight (n=48) dairy cows in the period from July–September 2018 were part of and at day 35±3 postpartum scored for BSC, synchronized using PG-3-G + Ovsynch protocol and randomly allocated into two treatments: PRID group (n=27) treated with external P4 device between G1 and PGF2α and CON group (n=21) left without treatment. Collection of blood samples to assess P4 concentrations was done at Pre-PG, at G1, at PGF2α, at 72 h after PGF2α (at timed artificial insemination TAI) and at d 21 after TAI. The pregnancy diagnosis was done at d 21 and d 30 after TAI by ultrasound. The average temperature-humidity index (THI) was 79.5±0.6. At G1, the P4 was significantly lower in the PRID group (1.84±0.99 ng/mL) in comparison to the CON group (2.97±1.82 ng/mL). In contrast, at PGF2α, there was a tendency (p=0.09) of increased P4 concentration in PRID group compared with the CON group (4.26±1.68 and 3.74±2.39 ng/mL), respectively. At TAI, more PRID cows (p=0.0001) had a lower P4 (0.06±0.03 ng/mL), in comparison to CON (1.28±2.41 ng/mL). At d 21 and d 30 after TAI, more PRID cows were predicted and diagnosed pregnant (16/27 or 59.25% and 13/27 or 48.14%) compared with the CON group (11/21 or 52.38% and 8/21 or 38.08%) respectively, but without any significant differences. Supplementation of the P4 during the Ovsynch protocol increases the P4 before TAI and reduces the incomplete luteolysis in heat stressed dairy cows.

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Section: Ultrasonographic Examination Blood Collection Cyclic Status ...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

External Progesterone Supplementation During the Ovsynch Protocol Reduces the Incomplete Luteolysis in Dairy Cows Under Heat Stress

Stojanov,

Atanasov,

Grizelj

et al. 2024

Macedonian Veterinary Review

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“…Entre los años 2001 y 2003, la tasa promedio de preñez en 21 días en 257 rodeos lecheros de Argentina, que incluían a 70 000 vacas que producen leche, fue de entre el 15% y el 16% (Barański et al, 2021). La cantidad de vacas detectadas en celo y enviadas a servicio fue del 45% y la tasa de concepción fue de entre el 36% y el 37% para estos rodeos (Atanasov et al, 2021). Estos resultados no difirieron significativamente del desempeño reproductivo que otros autores reportaron en los Estados Unidos y en Canadá (Tippenhauer et al, 2021).…”

Section: Introductionunclassified

Efecto en la eficiente reproductiva mediante el uso de dos protocolos (eCG y Ovsynch) para IATF en ganado bovino tropical

Sánchez-Cárdenas

Vargas-Rodríguez

2023

Rev. Vet. Zootec. Amaz.

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La situación económica mundial requiere de prácticas de manejo eficaces para mejorar la rentabilidad de los establecimientos de producción de leche, especialmente, en ganadería de trópico. El objetivo es demostrar el efecto en la eficiencia reproductiva mediante el uso de dos protocolos (eCG y Ovsynch) para IATF en ganado bovino de trópico. La metodología fue mediante tratamientos, con un diseño de bloque completamente al azar; se aplicaron bases de Ovsynch y el análisis de datos fue mediante el software InfoStat para análisis de varianza. Los resultados obtenidos fueron del tratamiento de 40 vacas a las que se aplicó el protocolo modificado (eCG), 26 (65%) resultaron preñadas a la palpación rectal a los 55 días de gestación y de 33 vacas a las que se aplicaron el protocolo tradicional de Ovsynch, 17 (51%) dieron positivo al diagnóstico de gestación transrectal al día 55 de la gestación. En conclusión, la inseminación a tiempo fijo en vacas Bos indicus lactantes y con los protocolos de Ovsynch es factible la detección de celos y preñez.

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“…The first injection of GnRH is given at a random stage of the oestrous cycle which causes ovulation or luteinization of the dominant follicle in most animals (Hussien et al, 2021). The reason for the second GnRH treatment two days after the PGF2 is to push back the timing of the LH surge and to synchronise ovulation such that single insemination is enough to ensure fertility (Atanasov et al, 2021;Randi et al, 2021;Pursely et al, 1995). However, because of multiple injections and handling administered at specific times, a greater direct cost of initial treatment is incurred.…”

Section: Introductionmentioning

confidence: 99%

Effect of Gonadotrophin Releasing Hormone on Follicular Dynamics, Luteinising Hormone, and Progesterone Levels in Bunaji Cows

Dare,

Mamman,

Kawu

et al. 2023

FUDMAJAAT

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This study evaluated the ovarian and hormonal responses of Bunaji cows to ovsynch protocol initiated at random oestrus cycle stages. Fifteen animals were arranged into three groups and treated as follows: control (n=5), 2mL normal saline; group A (n=5), 50mg Gonadotrophin releasing hormone (GnRH) on day 0 and day 9 followed by 500mg of Prostaglandin F2 alpha (PGF2a) on day 7; and group B (n=5) 100mg of GnRH on day 0 and day 9 followed by 500mg PGF2a on day 7. Ultrasound examination of the ovaries was carried out daily from d 1 to d 9 and, thereafter every 12h until ovulation was detected. Blood sampling was carried out at 30 min intervals for 6 h following the GnRH administration for determination of serum luteinizing hormone (LH) and once daily for 12 days after the injection of the first GnRH to determine plasma progesterone concentration. The ovarian response of the treated groups showed no significant difference between the two dosages of ovsynch protocol but differed significantly between the treated and the control groups. Peak values of serum LH obtained on day 0 and day 9 of GnRH administration differed significantly (P<0.05). Plasma progesterone increased among treated groups following injection of GnRH reaching a peak on day 7 compared to control, but did not differ among treated groups. In conclusion, GnRH at 50 mg and 100 mg was able to elicit adequate LH and progesterone responses that caused the disappearance of dominant follicles and, subsequent ovulation thereby increasing the reproductive efficiency of Bunaji cows.

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Luteolysis, progesterone, and pregnancy per insemination after modifying the standard 7-day Ovsynch program in Holstein-Friesian and Holstein cows

Cited by 8 publications

References 28 publications

External Progesterone Supplementation During the Ovsynch Protocol Reduces the Incomplete Luteolysis in Dairy Cows Under Heat Stress

External Progesterone Supplementation During the Ovsynch Protocol Reduces the Incomplete Luteolysis in Dairy Cows Under Heat Stress

Efecto en la eficiente reproductiva mediante el uso de dos protocolos (eCG y Ovsynch) para IATF en ganado bovino tropical

Effect of Gonadotrophin Releasing Hormone on Follicular Dynamics, Luteinising Hormone, and Progesterone Levels in Bunaji Cows

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