Low numbers of ovarian follicles ≥3 mm in diameter are associated with low fertility in dairy cows.

@article{Mossa2012LowNO,
  title={Low numbers of ovarian follicles ≥3 mm in diameter are associated with low fertility in dairy cows.},
  author={F. Mossa and S. Walsh and S. Butler and D. Berry and F. Carter and P. Lonergan and G. Smith and J. Ireland and A. Evans},
  journal={Journal of dairy science},
  year={2012},
  volume={95 5},
  pages={
          2355-61
        }
}
The total number of ovarian follicles ≥ 3mm in diameter (antral follicle count, AFC) during follicular waves varies among cattle of similar age, but AFC is highly repeatable within individuals. We hypothesized that lower AFC could be associated with reduced fertility in cattle. The AFC was assessed by ultrasonography for 2 d consecutively during the first wave of follicular growth of the estrous cycle, 4.6±1.43 d (mean ± SD) after estrus, in 306 Holstein-Friesian dairy cows approximately 70 d… Expand
Association between antral follicle count and reproductive measures in New Zealand lactating dairy cows maintained in a pasture-based production system.
TLDR
An association between AFC2 and fertility is confirmed, and these results support the hypothesis that cows with a greater number of antral follicles are more fertile than cattle with a lesser number of follicles. Expand
Ovarian follicular dynamics and conception rate in Bos indicus cows with different antral follicle counts subjected to timed artificial insemination.
TLDR
Nelore cows with fewer AFCs subjected to synchronization of time of ovulation had a larger follicular diameter and a greater conception rate than the groups with intermediate and a great AFCs. Expand
Antral follicle count in cattle: advantages, challenges, and controversy
TLDR
The aim of this review is to discuss the various data concerning AFC between indicus and taurus cattle and consider AFC to be a possible tool to improve cattle performance in reproductive biotechnology. Expand
Influence of age and ovarian antral follicle count on the reproductive characteristics of embryo donor mares
TLDR
Follicular growth rate, degree of uterine oedema and the number of antral follicles are higher in young mares with high AFC, however, the rate of embryonic recovery is not influenced by donors’ age or AFC. Expand
Fertilizability of oocytes derived from Holstein cows having different antral follicle counts in ovaries.
TLDR
It is suggested that oocytes derived from cows with high AFC had higher fertilizability than those from cowsWith low AFC when OPUs were performed at a short (3-4 days) interval, but oocyte quality in high-AFC cows was impaired by long-interval (7 days) OPU, possibly due to the degradation of follicles. Expand
Relationships between numbers of antral follicles and postpartum interval in Brahman females.
To determine relationships of ovarian antral follicle count (AFC) on d 28 postpartum with postpartum interval (PPI) and AFC on d 8 post-estrus, three-dimensional ultrasonography was performed onExpand
High numbers of antral follicles are positively associated with in vitro embryo production but not the conception rate for FTAI in Nelore cattle.
TLDR
There was no difference in the conception rates after FTAI between Nelore cows with high, intermediate or low AFC; however, Nelores cows withhigh oocyte production exhibited better in vitro embryo production. Expand
A single ultrasound determination of ≥25 follicles ≥3 mm in diameter in dairy heifers is predictive of a reduced productive herd life.
TLDR
It is concluded that dairy heifers with ≥25 follicles ≥3 mm in diameter have suboptimal fertility and a shorter productive herd life compared with herdmates with fewer follicles. Expand
igh numbers of antral follicles are positively associated with n vitro embryo production but not the conception rate for TAI in Nelore cattle ustavo
The objective was to compare the conception rates for FTAI and in vitro embryo production between Nelore cows with different antral follicle counts (AFC = number of follicles ≤3 mm in diameter in theExpand
Preovulatory follicle characteristics and oocyte competence in repeat breeder dairy cows.
TLDR
It is concluded that part of the RB cows' etiology occurs at an earlier phase of folliculogenesis, thereby impairing oocyte competence, and subsequently reducing the probability of normal fertilization, which diminish embryo vitality and development. Expand
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TLDR
Cows with a high AFC had higher pregnancy rates, shorter calving to conception intervals and received fewer services during the breeding season compared with cows with a low AFC, and there is evidence to indicate that fertility may be compromised in animals with low AFC. Expand
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TLDR
Fertility was not affected by the numbers of antral follicles >or=4 mm in diameter in a single follicular wave, and the average number of antrals per wave in the breeding cycle or post-breeding period did not affect conception rates. Expand
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TLDR
Ovarian ultrasound analysis can be used reliably by investigators to identify cattle that consistently have low or high numbers of follicles during waves, thus providing a novel experimental model to determine the causes and physiological significance of the high variation in antral follicle number during follicular waves among single-ovulating species, such as cattle or humans. Expand
Antral Follicle Count Reliably Predicts Number of Morphologically Healthy Oocytes and Follicles in Ovaries of Young Adult Cattle1
TLDR
The hypothesis that AFC is positively associated with the number of morphologically healthy oocytes and follicles in ovaries and with serum concentrations of anti-Müllerian hormone (AMH), an indirect marker for number of healthy follicles and oocytes in ovary, is tested. Expand
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TLDR
Phenotypic classification based on numbers of follicles may be useful to improve superovulation procedures and the lower proportion of transferable embryos following superovulations of ovaries with high numbers of hair follicles is probably not the result of differences in the quality of oocytes before superovulated. Expand
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TLDR
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TLDR
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TLDR
The results indicate that the inherent capacity of the pituitary gland to secrete gonadotropins does not differ between cattle with high v. low numbers of follicles during follicular waves. Expand
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