Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Experiment Videos

Pinealectomy delays puberty in ewe lambs.

D J Kennaway, T A Gilmore, E A Dunstan

    Journal of Reproduction and Fertility
    |May 1, 1985
    PubMed
    Summary

    Pinealectomy significantly delays puberty onset in ewe lambs, confirming the pineal gland

    Related Concept Videos

    You might also read

    Related Articles

    Articles linked to this work by shared authors, journal, and citation graph.

    Sort by
    Same author

    Melatonin: Facts, Extrapolations and Clinical Trials.

    Biomolecules·2023
    Same author

    Four days of simulated shift work reduces insulin sensitivity in humans.

    Acta physiologica (Oxford, England)·2018
    Same author

    Melatonin implants do not alter estrogen feedback or advance puberty in gilts.

    Animal reproduction science·2015
    Same author

    Maternal endocrine adaptation throughout pregnancy to nutrient manipulation: consequences for sexually dimorphic programming of thyroid hormones and development of their progeny.

    Theriogenology·2014
    Same author

    The effects of season and moderate nutritional restriction on ovarian function and oocyte nuclear maturation in cycling gilts.

    Theriogenology·2014
    Same author

    Acute inhibition of casein kinase 1δ/ε rapidly delays peripheral clock gene rhythms.

    Molecular and cellular biochemistry·2014

    Area of Science:

    • Reproductive endocrinology
    • Animal physiology
    • Chronobiology

    Background:

    • The pineal gland and its hormone melatonin are known to regulate seasonal reproduction in sheep.
    • Understanding the pineal gland's role in puberty onset is crucial for sheep farming and reproductive management.

    Purpose of the Study:

    • To investigate the effect of pinealectomy on the onset of puberty in ewe lambs.
    • To determine the influence of constant light exposure and maternal pineal status on puberty in offspring.

    Main Methods:

    • Pinealectomy was performed on ewes and ewe lambs, with control groups remaining unoperated.
    • Animals were exposed to constant light for specific periods.
    • Puberty onset was monitored weekly using progesterone analysis.

    Main Results:

    • Pinealectomized ewe lambs exhibited a significant delay in puberty onset compared to pineal-intact controls (49 vs. 37 weeks).
    • Constant light exposure during early life and maternal pineal status did not affect puberty onset in lambs.
    • Pinealectomized lambs entered anestrus later, aligning with the onset of the second breeding season.

    Conclusions:

    • The pineal gland plays a critical role in mediating hormonal signals that control puberty onset in sheep.
    • Pinealectomy disrupts the timing of reproductive cyclicity, impacting seasonal anestrus entry.

    Related Experiment Videos