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Related Concept Videos

Oogenesis02:07

Oogenesis

In human women, oogenesis produces one mature egg cell or ovum for every precursor cell that enters meiosis. This process differs in two unique ways from the equivalent procedure of spermatogenesis in males. First, meiotic divisions during oogenesis are asymmetric, meaning that a large oocyte (containing most of the cytoplasm) and minor polar body are produced as a result of meiosis I, and again following meiosis II. Since only oocytes will go on to form embryos if fertilized, this unequal...

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Windowing Chicken Eggs for Developmental Studies
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Published on: October 1, 2007

A model of egg production.

D R Charles

    British Poultry Science
    |July 1, 1984
    PubMed
    Summary

    This study developed a simulation model for laying hen performance, predicting egg output and food intake based on environmental and nutritional factors. The model accurately reflects real-world flock data, aiding in management decisions and financial assessments.

    Area of Science:

    • Animal Science
    • Agricultural Engineering
    • Quantitative Biology

    Background:

    • Laying hen productivity is influenced by numerous environmental and nutritional factors.
    • Optimizing feed intake and egg output is crucial for economic viability in poultry farming.
    • Existing models may not fully integrate diverse variables or financial outcomes.

    Purpose of the Study:

    • To develop an empirical simulation model for predicting laying hen food intake and egg output.
    • To assess the financial implications of various management and environmental conditions.
    • To provide a tool for examining the effects of management changes during the laying period.

    Main Methods:

    • Quantitative literature review to establish a data foundation.
    • Development of an empirical simulation model incorporating temperature, light, nutrition, and feeding systems.

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  • Calculation of gross margin (egg value minus food cost) for financial analysis.
  • Model validation against real-world flock records.

    • Main Results:

    • The simulation model provides realistic predictions of food intake and egg output.
    • The model quantifies performance depressions under sub-optimal environmental conditions.
    • Validated model demonstrates accuracy when tested with actual flock data.
    • FORTRAN program developed for detailed production period analysis.

    Conclusions:

    • The developed model is a valuable tool for optimizing laying hen management and financial returns.
    • The model can simulate the impact of environmental and nutritional changes on productivity.
    • Accessible versions for programmable calculators enhance practical application for farmers.