Increased pregnancy rate in beef heifers resynchronized with estradiol at 14 days after TAI

Motta, Igor Garcia; Rocha, Cecília Constantino; Bisinotto, D.Z.; Melo, Gustavo Augusto Schmidt de; Júnior, Gilmar Arantes Ataide; Silva, A.G.; Gonzaga, Vitor Hugo Guilger; Santos, J.A.; Freitas, Bruno; Lemes, Kleber Menegon; Madureira, Ed Hoffmann; Pugliesi, Guilherme

doi:10.1016/j.theriogenology.2020.02.009

Cited by 22 publications

(24 citation statements)

References 35 publications

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“…Doppler US has been used primarily in beef herds for pregnancy diagnosis between days 20 and 22 of gestation with accuracy exceeding 90% ( Pugliesi et al., 2014 , 2018 ; Motta et al., 2020 ). One of the main advantages of the early pregnancy diagnosis by Doppler US is its high sensitivity, close to 100%, which results in few false-negative diagnoses ( Pugliesi et al., 2014 ; Melo et al., 2020a ).…”

Section: Doppler Ultrasonographymentioning

confidence: 99%

New approaches to diagnose and target reproductive failure in cattle

et al. 2020

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Reproductive failure and pregnancy loss in cattle are some of the largest economic burdens to cattle producers and one of most perplexing factors influencing management decisions. Pregnancy loss may occur at any point during gestation with the largest percentage of loss occurring in the first 30 days and, subsequently, decreasing as the pregnancy progresses. Losses may be attributed to numerous factors, predisposed issues or environmental conditions such as nutritional stressors or disease. From a research perspective, determining the exact causes of pregnancy loss or embryonic mortality in cattle have been difficult, due to limitations of accurately determining early gestation pregnancy status. Until methods that precisely determine embryo success early in gestation are available, our understanding of in vivo pregnancy loss will lack clarity necessary to develop management strategies to decrease such loss. In this review, we will briefly discuss the pivotal periods of pregnancy loss affecting beef and dairy cattle, methods and technologies to determine pregnancy status and embryo viability and potential opportunities to decrease reproductive failure.

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Section: Doppler Ultrasonographymentioning

confidence: 99%

New approaches to diagnose and target reproductive failure in cattle

et al. 2020

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“…The expressions of FST, IL10RB, ATP6AP2, GNAI2 and PIK3R2 were signi cantly downregulated and relative expressions of PIK3R1 and CYP1A1 were signi cantly upregulated in the ovarian tissues of non-breeding yaks [32].Before fertilization, the mature oocyte seems to absorb nutrients through receptor-mediated endocytosis, indicating active energy use or storage [33]. Estradiol benzoate treatment can induce a new synchronized follicle wave emergence and increase the pregnancy rate of resynchronized non-pregnant heifers [34]. Reproductive seasonality, driven by either photoperiod or nutritional resource availability, has a signi cant in uence on the success of assisted reproductive technologies on wild cattle [35].…”

Section: Hormone and Postpartum Anestrus Of Yaksmentioning

confidence: 99%

A Comparative Transcriptome and Proteomics Study of Postpartum Ovarian Cycle Arrest in Yaks

Huo

Yang

Zhaxi

et al. 2020

Preprint

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Background: Postpartum ovarian cycle arrest is the main factor affecting yak reproductive efficiency. There are few reports regarding the molecular regulatory mechanism of postnatal estrus on transcriptome and proteome in yaks. Our previous studies focused on the ovaries of yaks with postnatal ovarian cycle arrest and postnatal estrus yaks. In this study, RNA sequencing transcriptomic was combined with quantitative proteomic analyses to identify postpartum ovarian cycle-related genes and proteins.Results: Consequently 1,149 genes and 24 proteins were found to be up- or downregulated during postnatal estrus. The analysis of differentially regulated genes identified three gene or protein pairs that were synchronously upregulated and no gene or protein pairs that were synchronously downregulated, suggesting that these upregulated genes may regulate the postpartum ovarian cycle. The functional classification of these differentially expressed genes and proteins indicated their connection with oocyte meiosis, the estrogen signaling pathway, progesterone-mediated oocyte maturation and the gonadotrophin releasing hormone (GnRH) signaling pathway. Conclusions: In this study, a total of six genes and two proteins involved in the oocyte meiosis, the estrogen signaling pathway, progesterone-mediated oocyte maturation and the GnRH signaling pathway were identified. This is the first report of a comprehensive transcriptomic and proteomic analysis of postnatal estrus on Yaks.

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“…The administration of 1.5 mg EB associated with an intravaginal P4 device 13 days after TAI negatively affected the pregnancy rate in dairy cows (VIEIRA et al, 2014). In contrast, administration of 1 mg EB associated to an intravaginal P4 device 14 days post-TAI did not affect the pregnancy rate from first TAI in beef heifers (MOTTA et al, 2020).…”

Section: Introductionmentioning

confidence: 67%

“…The administration of 1.5 mg EB associated with an intravaginal P4 device 13 days after TAI negatively affected the pregnancy rate in dairy cows (VIEIRA et al, 2014). On the other hand, the use of 1 mg EB associated with a P4 device 13 or 14 days after TAI in beef cows (PALHÃO et al, 2020) and heifers (MOTTA et al, 2020) did not risk the pre-existing pregnancy.…”

Section: List Of Tablesmentioning

confidence: 86%

“…Palhão et al (2020) reported satisfactory pregnancy rates at the second TAI when using 1 mg EB in the resynchronization program starting at day 13; however, the effects of 2 mg EB on FWE and pregnancy rates in suckled beef cows submitted to resynchronization program at day 12-14 after TAI are not known. Therefore, administration of smaller doses of EB might be a safe alternative for not risking the establishment of pregnancy (MOTTA et al, 2020), but these regimens may also be ineffective for synchronizing the time of FWE among suckled beef cows.…”

Section: Introductionmentioning

confidence: 99%

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>b<Comparison of estradiol benzoate doses at beginning of the synchronization and early resynchronization of ovulation for timed- insemination in >i<Bos indicus>/i< beef cows>/b<

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Increased pregnancy rate in beef heifers resynchronized with estradiol at 14 days after TAI

Cited by 22 publications

References 35 publications

New approaches to diagnose and target reproductive failure in cattle

New approaches to diagnose and target reproductive failure in cattle

A Comparative Transcriptome and Proteomics Study of Postpartum Ovarian Cycle Arrest in Yaks

>b<Comparison of estradiol benzoate doses at beginning of the synchronization and early resynchronization of ovulation for timed- insemination in >i<Bos indicus>/i< beef cows>/b<

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