Oestrous cycles in Bos taurus cattle.

@article{Forde2011OestrousCI,
  title={Oestrous cycles in Bos taurus cattle.},
  author={N. Forde and M. Beltman and P. Lonergan and M. Diskin and J. Roche and M. Crowe},
  journal={Animal reproduction science},
  year={2011},
  volume={124 3-4},
  pages={
          163-9
        }
}
The oestrous cycle in cattle lasts for 18-24 days. It consists of a luteal phase (14-18 days) and a follicular phase (4-6 days). During the cycle there are generally two (dairy cows) or three (heifers and beef cows) waves of ovarian follicle growth. Each wave of follicle growth consists of a period of emergence of a cohort of follicles, selection of a dominant follicle and either atresia or ovulation of the dominant follicle. These waves of follicle growth, initially established during the… Expand
Reproduction, Events and Management: Estrous Cycles: Characteristics
The estrous cycle in cattle lasts for 18–24 days. It consists of a luteal phase (14–18 days) and a follicular phase (4–6 days). During the cycle, there are generally two (dairy cows) or threeExpand
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TLDR
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TLDR
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TLDR
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TLDR
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TLDR
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Positive effects of biostimulation on luteinizing hormone concentration and follicular development in anestrous beef heifers.
TLDR
Exposure of anestrous beef heifers to AS resulted in a transient increase on LH secretion after 10 d of male exposure and increased follicular diameter attained during the second FW, which probably induced the greater follicular growth. Expand
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References

SHOWING 1-10 OF 86 REFERENCES
Selection, dominance and atresia of follicles during the oestrous cycle of heifers.
TLDR
The overall correlation of ultrasound measurements of follicle diameter with measures of follicles size after ovariectomy was high and the correlation between measurement of follicular growth by ultrasound, and measurement of intrafollicular ratios of oestradiol and progesterone concentrations and the serum concentrations of FSH during selection, dominance and atresia or ovulation of dominant follicles in heifers was high. Expand
Pattern of growth of dominant follicles during the oestrous cycle of heifers.
TLDR
The analysis of the rates of growth and atresia suggest that the rate of growth is slowest during mid-cycle, and the number of dominant follicles that developed in the ovary ipsilateral to the corpus luteum was greater than in the contralateral ovary. Expand
Resumption of ovarian cyclicity in post-partum beef and dairy cows.
  • M. Crowe
  • Biology, Medicine
  • Reproduction in domestic animals = Zuchthygiene
  • 2008
TLDR
There is a variable anoestrous period following parturition in the cow and the key to optimizing resumption of ovulation in both beef and dairy cows is appropriate pre-calving nutrition and management so that cows calve down in optimal body condition. Expand
Development of dominant follicles and length of ovarian cycles in post-partum dairy cows.
TLDR
The results show that the first ovarian cycle was predominantly short when the ovulatory dominant follicle was first detected after Day 20 post partum. Expand
Development of nonovulatory antral follicles in heifers: changes in steroids in follicular fluid and receptors for gonadotropins.
TLDR
At least two periods of growth and atresia of follicles occur between days 3-13 of an estrous cycle in heifers, and it is concluded that the first is during days3-7 when a single E-A follicle 6 mm or more in diameter develops and all other E-I follicles regress. Expand
Resumption of follicular activity in the early post-partum period of dairy cows.
TLDR
Follicular development during the post-partum anoestrous period was characterized by the growth and regression of small and medium-sized follicles, until a dominant follicle was detected, which ovulated in 14 cows, became cystic in 4 cows, and failed to ovulate in 1 cow. Expand
Resumption of follicular waves in beef cows is not associated with periparturient changes in follicle-stimulating hormone heterogeneity despite major changes in steroid and luteinizing hormone concentrations.
TLDR
To test the hypothesis that emergence of follicle waves postpartum is associated with a change in circulating FSH isoform distribution, 10 Limousin-cross suckler cows were blood sampled daily for FSH, LH, estradiol (E2), and progesterone assay. Expand
Follicular and hormonal dynamics during the first follicular wave in heifers.
TLDR
The results supported the hypotheses that deviation occurs rapidly (within 8 h), that elevated systemic LH concentrations are present during deviation, and that deviation is not preceded by an increase in systemic estradiol. Expand
Current concepts of the roles of follicle stimulating hormone and luteinizing hormone in folliculogenesis.
TLDR
The development-related response to LH shown by the pre-ovulatory follicle raises the possibility that exogenous LH might be used as an adjunct to therapy with exogenous FSH in clinical ovulation induction regimens where the aim is to induce monovulation. Expand
Pattern of follicular growth and resumption of ovarian activity in post-partum beef suckler cows.
TLDR
It is concluded that prolonged anoestrus in post-partum beef suckler cows is due to lack of ovulation of a dominant follicle rather than delayed development of dominant follicles. Expand
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