Corpus ID: 90769204

Variation in the number of ovarian follicles in cattle: Possible causes and consequences

  title={Variation in the number of ovarian follicles in cattle: Possible causes and consequences},
  author={Alexander C.O. Evans and Francesca Mossa and Trudee Fair and Pat Lonergan and George Wesley Smith and Fermin Jimenez-Krassel and Joseph K. Folger and Janet L. H. Ireland and James J. Ireland},
  journal={Acta Scientiae Veterinariae},
Background: Antral follicle count (AFC, follicles e”3 mm in diameter) varies between 5 and 50 follicles in among Bos taurus cattle. AFC is highly repeatable within animals, and is correlated with the total number of follicles in ovaries. Cattle with low AFC have higher circulating concentrations of FSH and LH, but lower concentrations of AMH, progesterone and androgens than animals with high AFC. Review: The cause of the inherently high variation in the number of follicles is unknown but it is… Expand
1 Citations
Short communication. In vitro oocyte maturation and fertilization rates in the Spanish Lidia bovine breed
It is suggested that oocytes of the Lidia cattle breed can be obtained, matured and fertilized following standard protocols previously used in other cattle breeds. Expand


Numbers of Antral Follicles During Follicular Waves in Cattle: Evidence for High Variation Among Animals, Very High Repeatability in Individuals, and an Inverse Association with Serum Follicle-Stimulating Hormone Concentrations1
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
Follicle numbers are highly repeatable within individual animals but are inversely correlated with FSH concentrations and the proportion of good-quality embryos after ovarian stimulation in cattle.
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
Evidence That High Variation in Ovarian Reserves of Healthy Young Adults Has a Negative Impact on the Corpus Luteum and Endometrium During Estrous Cycles in Cattle1
The results supported the conclusion that high variation in ovarian reserves of young adults is associated with alterations in differentiation and function of the corpus luteum and provided insight into the potential factors that may cause suboptimal luteal function and infertility in individuals with diminished ovarian reserves. Expand
Antral Follicle Count Reliably Predicts Number of Morphologically Healthy Oocytes and Follicles in Ovaries of Young Adult Cattle1
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
Variation in the Ovarian Reserve Is Linked to Alterations in Intrafollicular Estradiol Production and Ovarian Biomarkers of Follicular Differentiation and Oocyte Quality in Cattle1
Abstract The mechanisms whereby the high variation in numbers of morphologically healthy oocytes and follicles in ovaries (ovarian reserve) may have an impact onovarian function, oocyte quality, andExpand
Characteristics of ovarian follicle development in domestic animals.
  • A. Evans
  • Biology, Medicine
  • Reproduction in domestic animals = Zuchthygiene
  • 2003
Understanding the pattern of follicle development in different species is increasingly important for designing improved methods to manipulate reproduction in domestic animals. Expand
Anti-Müllerian Hormone Is an Endocrine Marker of Ovarian Gonadotropin-Responsive Follicles and Can Help to Predict Superovulatory Responses in the Cow1
AMH was found to be a reliable endocrine marker of the population of small antral gonadotropin-responsive follicles in the cow and concentrations in the plasma of individuals were indicative of their ability to respond to superovulatory treatments. Expand
Mechanisms for dominant follicle selection in monovulatory species: a comparison of morphological, endocrine and intraovarian events in cows, mares and women.
  • M. Mihm, A. Evans
  • Biology, Medicine
  • Reproduction in domestic animals = Zuchthygiene
  • 2008
Functional studies of the selection of DFs in cattle and mares are also valuable for identifying genes and pathways regulating DF development in women and highlights similarities and differences in follicular wave growth between cows, mares and women. Expand
Mechanism of follicle deviation in monovular farm species.
The difference in diameter between the two largest follicles at the beginning of deviation is compatible with rapid establishment of the destiny of the two follicles before the second-largest follicle can also show dominance and results of in vitro studies support this conclusion. Expand
Inherent capacity of the pituitary gland to produce gonadotropins is not influenced by the number of ovarian follicles > or = 3 mm in diameter in cattle.
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