Associations of antral follicle count with fertility in cattle: A review

Alward, Kayla; Cockrum, Rebecca; Ealy, Alan D.

doi:10.3168/jdsc.2022-0283

Cited by 9 publications

(9 citation statements)

References 34 publications

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“…The AFC values obtained from this study surpass those reported by Cushman et al (2014) (21.4) and Grigoletto et al (2020) (12.49) in their respective evaluations of Angus and Nellore heifers. It is crucial to underscore that numerous intrinsic factors tied to animal physiology, such as breed differences between Bos taurus and Bos indicus (Alward et al, 2023), the phase of the estrous cycle (Ireland et al, 2008), age (Burns et al, 2005), body condition (Moraes et al, 2019), nutritional status (Cushman et al, 2014), and individual genetic variability, can influence these results.…”

Section: Resultsmentioning

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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Section: Resultsmentioning

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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“…In this regard, the prostaglandinendoperoxide synthase 1 gene (PTSGS1), which is associated with AMH, was also positively correlated with ovulation, NCE and NTE (Gobikrushanth et al 2018;Jaton et al 2016). Similarly, SNPs and genes associated with AFC were involved in superovulatory-related processes, such as regulation of primordial germ cells and cellular maintenance (Alward et al 2023).…”

Section: Discussionmentioning

confidence: 99%

Polymorphisms within the <em>IGF1</em> and <em>IGF1R</em> genes associated with superovulation-related traits in Holstein dairy cows managed in a semiarid environment

Rodríguez-Borbón,

Medrano,

Thomas

et al. 2023

J. Anim. Behav. Biometeorol.

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Embryo transfer (ET) is an artificial reproductive technology used for the genetic improvement of cattle. High variation has been observed in superovulation (SPO) and embryo flush recovery, which appear to be influenced by donor cow genetics. Then, the objective was to identify single nucleotide polymorphisms (SNPs) from the genes IGF1 and IGF1R associated with reproductive traits related to SPO response in dairy cows raised in a semiarid region. Sixty-four Holstein cows were subjected to SPO, artificial insemination, and nonsurgical embryo collection. Individual blood samples were collected and used to genotype 13 SNPs from the genes IGF1 and IGF1R. Additional blood samples were collected to measure anti-Mullerian hormone (AMH) concentrations. Ovarian and embryo traits related to SPO response were evaluated. A mixed-effects model was used to identify associations between SNPs and SPO-related traits. A regression model was implemented to calculate allele substitution effects. From 13 SNPs, the SNP rs109763947 in the gene IGF1 and the SNPs rs110343126 and rs208140993 in the gene IGF1R were predictors for six traits evaluated in superovulated cows. The most favorable genotypes for these SNPs were CC, AA and GG, respectively. A linear trend was detected, suggesting an additive effect of the genes. Moreover, all traits evaluated in the current study improved as the number of favorable SNP genotypes increased, confirming a positive contribution of the SNP genes. In conclusion, three SNPs in the genes IGF1 and IGF1R were marker predictors for reproductive traits related to SPO response and embryo production in Holstein cows managed in a semiarid region.

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“…A population of antral follicles in a cow corresponds to the quantity of follicles present in the ovaries throughout the animal's life. The measurement of this parameter is carried out through the count of antral follicles (CFA) larger than 3 mm in diameter, which is performed by transrectal or transvaginal ultrasonography in female cattle (Alward et al, 2023). In this context, animals can be classified into high and low follicle counts.…”

Section: Antral Follicular Count (Afc's)mentioning

confidence: 99%

Mesenchymal stem cells in animal reproduction: sources, uses and scenario

Oliveira,

Braga,

Miranda

et al. 2024

Braz. J. Vet. Med.

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Studies regarding mesenchymal stem cells turned up in the 1960's and this cell type created a great number of questions about its functions and applicability in science and medicine. When used with therapeutic intent, these cells present an inclination to migrate to sites of injury, inflammation or disease, where they secrete bioactive factors that stimulates the synthesis of new tissue. In this context, studies using rodents reported that MSCs promoted positive effects in the ovarian function in mice with premature aging of follicular reserve. In female bovines, experimental stem cell-based therapies have been used to either generate new oocytes with in vitro quality or stimulate such action in vivo. It is also reported, that the intraovarian application of mesenchymal stem cells generates a greater production of embryos in vitro and the production of early and expanded blastocysts. Additionally, analysis of ovarian tissue in animal subjected to treatment showed an increase in the number of developing follicles. Nevertheless, the treatments involving stem cells with different modes of application, different sources and different species were able to act on the hormonal, tissue, cellular and metabolic levels, generating positive results in the recovery and improvement of ovarian functions.

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Associations of antral follicle count with fertility in cattle: A review

Cited by 9 publications

References 34 publications

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

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

Polymorphisms within the <em>IGF1</em> and <em>IGF1R</em> genes associated with superovulation-related traits in Holstein dairy cows managed in a semiarid environment

Mesenchymal stem cells in animal reproduction: sources, uses and scenario

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