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Related Experiment Videos

Ovarian development in Meishan pigs.

T Miyano1, J Akamatsu, S Kato

  • 1Department of Animal Reproduction, Faculty of Agriculture Kobe University, Kobe 657, Japan.

Theriogenology
|April 1, 1990
PubMed
Summary
This summary is machine-generated.

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Meishan gilts exhibit early ovarian development, with vesicular follicles appearing by 45 days. This precocity suggests a potential for earlier reproductive maturity in this gilt model.

Area of Science:

  • Reproductive Biology
  • Swine Endocrinology
  • Ovarian Physiology

Background:

  • The Meishan pig breed is known for its reproductive precocity.
  • Understanding the early ovarian development in Meishan gilts is crucial for swine reproduction research.
  • Previous studies have not fully detailed the onset of follicular development in this breed.

Purpose of the Study:

  • To investigate the morphological and histological changes in Meishan gilt ovaries.
  • To determine the age of onset for vesicular follicle development and estrous cyclicity in Meishan gilts.
  • To assess the ovarian response to exogenous gonadotropins in young Meishan gilts.

Main Methods:

  • Morphological and histological examination of ovaries from 35 Meishan gilts of varying ages.

Related Experiment Videos

  • Observation of follicular development (vesicular and protruding follicles).
  • Assessment of ovarian weight and presence of corpora lutea.
  • Evaluation of ovarian response to exogenous gonadotropin treatment.

    • Main Results:

    • Vesicular follicles were observed in ovarian sections as early as 45 days of age.
    • Ovarian weight increased significantly with the development of protruding follicles.
    • Corpora lutea were present in approximately 50% of gilts between 75 and 90 days of age, indicating early estrous cycles.
    • Ovarian stimulation occurred by 45 days of age in gilts treated with exogenous gonadotropins.

    Conclusions:

    • Meishan gilts display early ovarian development, characterized by the presence of vesicular follicles at a young age.
    • The observed ovarian precocity in Meishan gilts is linked to early follicular development.
    • These findings support the Meishan gilt as a valuable model for studying early reproductive maturation in swine.