Ovarian follicular dynamics and conception rate in Bos indicus cows with different antral follicle counts subjected to timed artificial insemination

Morotti, Fábio; Moretti, Rogério; Santos, Gustavo Martins Gomes dos; Silva-Santos, Kátia Cristina; Cerqueira, Pedro Henrique Ramos; Seneda, Marcelo Marcondes

doi:10.1016/j.anireprosci.2017.12.001

Cited by 43 publications

(49 citation statements)

References 27 publications

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“…The fact that the number of primordial follicles is correlated to surface antral follicle counts and ultrasonographic antral follicle counts supports the relatively greater repeatability of antral follicle count in the present study and previous studies (Burns et al, 2005;McNeel et al, 2017;Morotti et al, 2018). There is no evidence of day of the estrous cycle or fluctuations in antral follicle numbers due to stage of the follicular wave influencing the number of pre-antral follicles in cattle (Rajakoski, 1960;Erickson, 1966).…”

Section: Discussionsupporting

confidence: 89%

“…Based on within animal variance divided by between animal variance (Morotti et al, 2018), the repeatability of antral follicle counts within heifers was 80% in the present study. There was no interaction of age of heifer and age of dam on ultrasonographic antral follicle count (P = 0.56).…”

Section: Ultrasonographic Measurementsmentioning

confidence: 52%

“…One proxy that can be used to estimate the size of the ovarian reserve is ultrasonographic determination of antral follicle number (Cushman et al, 2009). The number of antral follicles detectable by ultrasonography is highly repeatable (Burns et al, 2005;McNeel et al, 2017;Morotti et al, 2018), and the number of antral follicles is positively correlated with the number of microscopic primordial follicles in cattle ovaries (Cushman et al, 1999;Ireland et al, 2008). Walsh et al (2014) reported that maternal age affected the number of antral follicles detectable by ultrasonography in the ovaries of the daughters at a year of age.…”

Section: Introductionmentioning

confidence: 99%

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Maternal age influences the number of primordial follicles in the ovaries of yearling Angus heifers

Tenley

Gomes

Rosasco

et al. 2019

Animal Reproduction Science

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The number of antral follicles detectable by ultrasonography in heifers is influenced by age of the dam, because daughters of primiparous cows have fewer antral follicles than daughters of mature cows. We, therefore, hypothesized that heifers with primiparous dams would have fewer primordial follicles in their ovaries than heifers born to mature (4+ y) cows. Angus heifers (n = 464) were submitted for ultrasonographic evaluation of antral follicle number at 325, 355, and 385 d of age. Ovaries were collected from a random subset of heifers (n = 79) and processed for histological evaluation to determine number of primordial follicles. A greater percentage of heifers with primiparous dams had a corpus luteum at first ultrasonographic examination; however, a greater percentage of heifers with multiparous dams had ovulated by the start of breeding (P < 0.01). Heifers with primiparous dams had fewer antral follicles detectable by ultrasonography (P < 0.01). Heifers with primparous dams had fewer surface antral follicles on their ovaries (P < 0.01), and the number of primordial follicles per histological section was less for heifers with primiparous dams (P = 0.02). These data indicate that the lesser number of antral follicles detectable by ultrasonography in heifers with primparous dams is due to less ovarian follicle reserves. Selecting replacement heifers from mature dams may result in daughters

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Section: Discussionsupporting

confidence: 89%

Section: Ultrasonographic Measurementsmentioning

confidence: 52%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Maternal age influences the number of primordial follicles in the ovaries of yearling Angus heifers

Tenley

Gomes

Rosasco

et al. 2019

Animal Reproduction Science

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“…Furthermore, cows with HFC had an increased number of total oocytes recovered by ultrasound‐guided follicular aspiration (ovum pick up [OPU]) and, consequently, a greater number of total embryos produced by in vitro fertilization (IVF; Ireland et al, ). However, a recent study showed that Nelore cows ( Bos indicus ) with lower antral follicle counts had larger follicular diameters and a higher conception rate (Morotti et al, ).…”

Section: Introductionmentioning

confidence: 99%

“…Dairy cows with low follicle counts (LFCs) had lower pregnancy rates at first service, longer intervals from calving to conception and higher numbers of services received during the breeding season compared with cows with higher follicle counts (HFCs; Mossa et al, up [OPU]) and, consequently, a greater number of total embryos produced by in vitro fertilization (IVF; Ireland et al, 2007). However, a recent study showed that Nelore cows (Bos indicus) with lower antral follicle counts had larger follicular diameters and a higher conception rate (Morotti et al, 2018).…”

mentioning

confidence: 99%

Follicle populations and gene expression profiles of Nelore and Angus heifers with low and high ovarian follicle counts

Favoreto

Loureiro

Ereno

et al. 2018

Molecular Reproduction Devel

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The number of antral follicles counted (AFC) by ultrasound is associated with fertility in cattle. Cows with higher follicle count (HFC) have higher performance in reproductive‐assisted technologies than cows with lower follicle count (LFC). In this study, we aimed to define the preantral follicle count by histology and to identify differentially expressed genes (DEGs) using a microarray in Nelore and Angus heifers with HFC and LFC. The ovaries of each animal were scanned with an ultrasound device 12 to 24 hr after estrus. The groups were formed based on the average number of total follicles (≥3 mm) counted in each breed consistently ± the standard deviation. For the histological analysis, preantral follicles were counted and classified under a stereo microscope, and follicle density was determined. Microarray analysis was performed on pools of three follicles dissected from the ovaries of 15 Nelore (6 HFC and 9 LFC) and 17 Angus heifers (9 HFC and 8 LFC). Angus heifers have increased total and primordial follicle density. Nelore heifers have increased antral follicle count. Different patterns of gene expression regulate follicle recruitment and development in Angus and Nelore heifers and may be associated with the different follicle densities observed in Angus versus Nelore heifers. Furthermore, HFC heifers presented increased expression of genes associated with cellular development and metabolism.

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Artificial Insemination Program in Cattle

Morotti

Lorenzetti

Seneda

2021

Sustainable Agriculture Reviews

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Ovarian follicular dynamics and conception rate in Bos indicus cows with different antral follicle counts subjected to timed artificial insemination

Cited by 43 publications

References 27 publications

Maternal age influences the number of primordial follicles in the ovaries of yearling Angus heifers

Maternal age influences the number of primordial follicles in the ovaries of yearling Angus heifers

Follicle populations and gene expression profiles of Nelore and Angus heifers with low and high ovarian follicle counts

Artificial Insemination Program in Cattle

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