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Related Concept Videos

Ovarian Cycle01:27

Ovarian Cycle

The menstrual cycle includes a critical component known as the ovarian cycle, which undergoes two main phases each month—the follicular phase and the luteal phase. The follicular phase is variable and averaging around 14 days. Ovulation, triggered by a surge in luteinizing hormone (LH), marks the transition between the two phases. The second phase, the luteal phase, is relatively consistent, lasting approximately 14 days, and is marked by the activity of the corpus luteum. While a cycle length...
Hormonal Control of the Ovarian Cycle01:30

Hormonal Control of the Ovarian Cycle

The ovarian cycle is meticulously regulated by the hypothalamic-pituitary-gonadal axis. This cycle orchestrates the release of a mature oocyte, essential for reproduction.
Before puberty, the hypothalamus releases GnRH in a low frequency, low amplitude pulsatile manner. This along with the immature hypothalamic-pituitary-gonadal axis activity, results in low estrogen levels and the absence of a fully functional ovarian cycle.  At puberty, GnRH secretion increases in both frequency and...
Energy Budgets and Reproductive Strategies00:51

Energy Budgets and Reproductive Strategies

Organisms must balance energy intake with the energy required for growth, maintenance, and reproduction. These trade-offs result in a variety of survivorship and reproductive strategies, including semelparity and iteroparity. Semelparous species reproduce only once in their lifetime, often investing most available resources into that single reproductive event. Iteroparous species, by contrast, reproduce multiple times over their lifetimes, typically allocating fewer resources to any single...

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Related Experiment Video

Updated: Jun 3, 2026

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
09:05

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle

Published on: August 30, 2021

Reproductive cycles in pigs.

N M Soede1, P Langendijk, B Kemp

  • 1Adaptation Physiology Group, Wageningen University, Wageningen, The Netherlands. Nicoline.Soede@wur.nl

Animal Reproduction Science
|March 15, 2011
PubMed
Summary
This summary is machine-generated.

The pig oestrous cycle involves distinct follicular and luteal phases, crucial for reproductive success. Understanding these phases and factors like nutrition aids in managing gilt reproduction and optimizing ovulation.

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Last Updated: Jun 3, 2026

Rodent Estrous Cycle Monitoring Utilizing Vaginal Lavage: No Such Thing As a Normal Cycle
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Published on: August 30, 2021

Proteolytically Degraded Alginate Hydrogels and Hydrophobic Microbioreactors for Porcine Oocyte Encapsulation
07:45

Proteolytically Degraded Alginate Hydrogels and Hydrophobic Microbioreactors for Porcine Oocyte Encapsulation

Published on: July 30, 2020

Area of Science:

  • Reproductive biology
  • Endocrinology
  • Swine reproduction

Background:

  • The oestrous cycle in pigs is a critical reproductive process, lasting 18-24 days.
  • It comprises a follicular phase (5-7 days) and a luteal phase (13-15 days).
  • Follicular development and ovulation dynamics are influenced by various physiological and environmental factors.

Purpose of the Study:

  • To describe the endocrine processes governing the follicular and luteal phases in pigs.
  • To discuss the impact of nutrition and metabolic status on these reproductive phases.

Main Methods:

  • Review of endocrine mechanisms regulating the oestrous cycle.
  • Discussion of follicle development and ovulation in swine.
  • Consideration of nutritional and metabolic influences.

Main Results:

  • Follicular phase: development of pre-ovulatory follicles from smaller antral follicles.
  • Luteal phase: progesterone inhibits gonadotrophins, impacting early follicle development.
  • Post-weaning: follicular phase initiates, leading to oestrus and ovulation 4-7 days later.

Conclusions:

  • The interplay between follicular and luteal phases is vital for successful ovulation in pigs.
  • Early antral follicle pool formation during the luteal phase significantly impacts subsequent follicular phase dynamics.
  • Nutrition and metabolic status play a role in regulating these endocrine processes and reproductive outcomes.