Synchronization of stage of follicle development before OPU improves embryo production in cows with large antral follicle counts

Garcia, Sheila Merlo; Morotti, Fábio; Cavalieri, Fábio Luiz Bim; Lunardelli, Paula Alvares; Santos, Andressa dos; Membrive, Claudia Maria Bertan; Castilho, Caliê; Puelker, R. Z.; Silva, José Otávio Folino; Zangirólamo, Amanda Fonseca; Seneda, Marcelo Marcondes

doi:10.1016/j.anireprosci.2020.106601

Cited by 19 publications

(7 citation statements)

References 33 publications

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“…High AFC bovine females have been described to have a greater number of viable embryos produced in vivo per animal [39][40][41]. Similarly, in IVEP-ovum pick-up (OPU) procedures, high AFC animals resulted in a higher rate of blastocyst production than low AFC females [24,42].…”

Section: Antral Follicle Count and Fertility In Dairy Cattlementioning

confidence: 99%

Folliculogenesis, Fertility and Biotechnology in Dairy Cattle

Seneda¹,

Delchiaro²,

Zangirólamo³

et al. 2022

New Advances in the Dairy Industry

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The ovarian follicle population is formed by thousands of follicles, preantral and antral, where oocytes are included. During fetal life, the first follicles produced are preantral, and, as they undergo the development process, they reach the final stage of antral follicles, where a cavity/or antrum is developed. All this growth phase is called folliculogenesis, and this chapter will abord the most important aspects of this process. Moreover, not all follicles reach the preovulatory phase and can be fertilized, so we will discuss how reproductive biotechniques can positively influence the fertility of bovine females. We will also discuss the possibility of antral follicle count to influence reproductive performance and the correlation to biotechniques. Finally, we present alternatives on how to improve fertility and productive efficiency in dairy herds.

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Section: Antral Follicle Count and Fertility In Dairy Cattlementioning

confidence: 99%

Folliculogenesis, Fertility and Biotechnology in Dairy Cattle

Seneda¹,

Delchiaro²,

Zangirólamo³

et al. 2022

New Advances in the Dairy Industry

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“…2024 and RTS indicate reproductive efficiency. The use of transrectal ultrasonography to measure AFC is recognized as a valuable tool for identifying females with a higher likelihood of reproductive success (Garcia et al, 2020). Ultrasonography can also be employed to assess the RTS, a measure of the genital tract's maturation level in bovine heifers.…”

Section: Introductionmentioning

confidence: 99%

Estimation of genetic parameters for reproductive traits evaluated by ultrasonography in Senepol heifers

Pereira,

Gomes,

Faria

et al. 2024

Sem. Ci. Agr.

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Studies on reproductive tract score (RTS) and antral follicle count (AFC) in Senepol cattle are limited. These traits are essential as they are linked to the reproductive ability and reproductive performance of animals. Understanding the heritability and genetic correlation of these traits is crucial for guiding selection programs and selecting animals with greater reproductive efficiency and higher production potential. Therefore, this study aimed to estimate the genetic parameters of weight, RTS, and AFC in Senepol cattle using transrectal ultrasonography. Reproductive data were collected from 850 female Senepol cattle aged 10-16 months. At the time of evaluation, the following were measured: RTS traits (scores from 1 to 5), AFC (0 to 100), and female weight (kg). Variance and covariance components, genetic heritability, and correlations were estimated by univariate and bivariate analyses using the bull model. Heritability estimates were moderate for AFC (0.52) and weight (0.46), and low for RTS (0.12). The genetic correlation between RTS and AFC was almost zero (-0.05). The estimated genetic correlation between weight and AFC was -0.41, while the correlation between weight and RTS was 0.48. Selective breeding of AFC and RTS can enhance the reproductive efficiency of the herd and result in animals with earlier pubertal age and increased fertility.

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“…Studies have shown that females with high AFC (≥ 25 follicles) result in better reproductive performance when submitted to reproductive programs involving artificial insemination (Evans et al, 2012;Mossa et al, 2012;Martinez et al, 2016) and in vivo and in vitro embryo production both Bos taurus (Ireland et al, 2007(Ireland et al, , 2008(Ireland et al, , 2011Jimenez-Krassel et al, 2009;Silva-Santos et al, 2014) and Bos indicus cattle (Santos et al, 2016;Garcia et al, 2020). However, this reproductive characteristic is still poorly understood and has not been a consensus in the main results among studies (Ireland et al, 2011;Evans et al, 2012;Morotti et al, 2015Morotti et al, , 2017.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of three classification methods of antral follicle count and fertility to the timed artificial insemination in cattle

et al. 2022

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The controversial data about antral follicle count (AFC) may be partially explained by the different criteria used to determine what is high, intermediate and low AFC. This study evaluated different classification methods for AFC groups, relating them to the conception rate, dominant follicle size and body condition score (BCS) in cows submitted to timed artificial insemination (TAI). Nelore cows (Bos indicus; n = 935), received a reproductive program consisting of TAI and natural breeding. Conception rate, BCS and dominant follicle size during TAI were evaluated by three AFC methodologies: i) mean and standard deviation: low (≤ 15 follicles); intermediate (≥ 16 to ≤ 44 follicles) or high (≥ 45 follicles); ii) quartiles: low (≤ 15 follicles); intermediate (≥ 16 to ≤ 39 follicles), or high (≥ 40 follicles); and iii) AFC score: I (low; ≤ 15 follicles); II (intermediate; ≥ 16 to ≤ 30 follicles); III (high; ≥ 31 to ≤ 44 follicles) or IV (very high; ≥ 45 follicles).Data were analyzed by a GLIMMIX and Tukey test or binary logistic regression model (P ≤ 0.05). The conception rate to TAI was influenced (P < 0.05) by AFC in the three methods classification, being the highest conception rate observed in the low AFC group regardless of method utilized: Mean (low 61.73% a , intermediate 54.02% ab and high 49.48% b ), Quartiles (low 61.73% a , intermediate 53.59% ab and 51.46% b ) and Score (I 61.73% a , II 54.80% ab , III 53.23% ab and IV 49.48% b ). There were variations (P < 0.05) in the conception rate within the 2.50 to 2.75 BCS range for all AFC classification methods, with the low AFC females presenting the best results, regardless of the method used. Also, females with low AFC showed larger (P < 0.05) diameters of dominant follicles at the TAI regardless of method. The different methodologies used (Mean, Quartile and Score) to AFC classification showed a consistency between the main findings, and we believe that this standardization will facilitate the interpretation of data involving AFC.

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Synchronization of stage of follicle development before OPU improves embryo production in cows with large antral follicle counts

Cited by 19 publications

References 33 publications

Folliculogenesis, Fertility and Biotechnology in Dairy Cattle

Folliculogenesis, Fertility and Biotechnology in Dairy Cattle

Estimation of genetic parameters for reproductive traits evaluated by ultrasonography in Senepol heifers

Evaluation of three classification methods of antral follicle count and fertility to the timed artificial insemination in cattle

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