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A model for persistency of egg production
M Grossman1, T N Gossman, W J Koops
1Department of Animal Sciences, University of Illinois, Urbana 61801, USA. mikeg@uiuc.edu
Poultry Science
|February 24, 2001
Summary
This study introduces a new definition and mathematical model for egg production persistency, crucial for improving total egg production through genetic selection. The model quantizes persistency as weeks of constant production, aiding in hen performance evaluation.
Area of Science:
- Animal Science
- Quantitative Genetics
- Poultry Science
Background:
- Egg production persistency is vital for total yield, yet current models lack precise measures.
- Hens can have similar total production but vary in egg production curves due to differing persistency.
Purpose of the Study:
- Propose a novel definition for egg production persistency.
- Develop a mathematical model incorporating this new persistency measure.
- Establish a selection criterion to enhance total egg production.
Main Methods:
- Defined persistency as the duration (in weeks) of sustained constant egg production.
- Developed new mathematical models for flock and individual egg production curves.
- Incorporated parameters like transition times, production level, and decline rate.
Main Results:
- The new definition quantifies egg production persistency in terms of time.
- The developed models describe egg production curves using biologically relevant parameters.
- Demonstrated model utility with flock and individual data sets.
Conclusions:
- The proposed definition and model offer a new measure for egg production persistency.
- This approach is valuable for genetic selection aimed at increasing persistency and total egg production.
- Provides a better understanding of persistency's relationship with other egg production traits.