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Related Concept Videos

Teratogenicity01:07

Teratogenicity

The ability of a drug to produce structural deformations and functional abnormalities in the developing embryo or the fetus is called teratogenicity, and the drug producing this effect is known as a teratogen. Teratogenic effects include stillbirth, miscarriage, intrauterine growth restriction, and neurocognitive delay. A teratogen may affect the embryo at different stages of development, which is important in determining the type and extent of the damage. During blastocyst formation, the early...
Infertility in Males01:23

Infertility in Males

Male infertility affects millions of couples worldwide, arising from various factors that impact different stages of the reproductive process. An endocrine imbalance resulting from conditions like hypogonadism, Klinefelter syndrome, or pituitary disorders can disrupt hormone levels and reduce sperm production. Testicular defects, such as tumors, cryptorchidism, atrophic testes, abnormal sperm morphology, and low sperm count or motility, may arise due to genetic factors, structural...
Infertility in Females01:28

Infertility in Females

Female infertility is defined as the inability to conceive after a year of regular, unprotected intercourse and affects about 10–15% of couples worldwide. The primary cause of female infertility is ovulatory disorders, which hinder the release of eggs. These disorders can be classified as hypothalamic amenorrhea, polycystic ovarian syndrome (PCOS), premature ovarian failure, and hyperprolactinemic anovulation disorders.
Endometriosis, a condition characterized by abnormal growth of endometrial...
Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches01:23

Types of Biopharmaceutical Studies: Controlled and Non-Controlled Approaches

Biopharmaceutical studies constitute a vital field aiming to enhance drug delivery methods and refine therapeutic approaches, drawing upon diverse interdisciplinary knowledge. In research methodologies, the choice between controlled and non-controlled studies significantly influences the study's reliability and accuracy.
Non-controlled studies, commonly employed for initial exploration, lack a control group, rendering them susceptible to biases and external influences. In contrast, controlled...
Overview of the Reproductive System01:31

Overview of the Reproductive System

The reproductive system generates offspring, ensuring the survival of the species. In humans, the reproductive system is complex and involves a variety of organs and hormones that work together to ensure successful reproduction.
The gonads, or primary reproductive organs, produce gametes and sex hormones. In males, the testes produce spermatozoa and testosterone, which is responsible for developing secondary male sex characteristics, including a deeper voice, larger muscles, facial and body...
Relative Risk01:12

Relative Risk

Relative risk (RR) is a statistical measure commonly used in epidemiology to compare the likelihood of a particular event occurring between two groups. This metric is important for evaluating the relationship between exposure to a specific risk factor and the probability of a particular outcome. It plays a crucial role in medical research, public health studies, and risk assessment. Relative risk quantifies how much more (or less) likely an event is to occur in an exposed group compared to an...

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Related Experiment Video

Updated: Jul 18, 2026

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats
06:38

Determination of Reproductive Competence by Confirming Pubertal Onset and Performing a Fertility Assay in Mice and Rats

Published on: October 13, 2018

Assessment of reproductive risks.

E D Clegg, C S Sakai, P E Voytek

    Biology of Reproduction
    |February 1, 1986
    PubMed
    Summary

    This paper reviews toxicity testing and risk assessment for reproductive hazards. It details reproductive testing protocols and risk assessment components, using dibromochloropropane as an example.

    Area of Science:

    • Environmental Toxicology
    • Reproductive Toxicology
    • Risk Assessment

    Background:

    • Regulatory processes evaluate reproductive and developmental toxicity of agents.
    • Risk assessment procedures are crucial for evaluating these hazards.

    Purpose of the Study:

    • To discuss toxicity testing and the regulatory process, emphasizing risk assessment.
    • To present the U.S. EPA's Pesticide Assessment Guidelines as an example of toxicity testing protocols.
    • To examine the components of reproductive risk assessment and identify research needs.

    Main Methods:

    • Review of toxicity testing protocols, including acute, subchronic, chronic, and short-term tests for reproductive effects.
    • Examination of the four components of reproductive risk assessment: hazard identification, dose-response assessment, exposure assessment, and risk characterization.

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  • Demonstration of reproductive risk assessment approaches using effects of dibromochloropropane on rabbit testicular parameters.

    • Main Results:

    • Description of protocols and endpoints used in reproductive toxicity testing.
    • Detailed examination of the four key components of reproductive risk assessment.
    • Identification of research needs in screening, dose-response testing, toxicokinetics, endpoint development, and extrapolation.

    Conclusions:

    • Reproductive risk assessment is a critical component of regulatory processes for toxic agents.
    • The paper highlights current methodologies and identifies areas for future research and anticipated changes in reproductive risk assessment.
    • Understanding and influencing reproductive risk assessment is vital for public health and environmental protection.