Multiphasic analysis of embryonic mortality in chickens

Area of Science:

• Poultry Science
• Reproductive Biology
• Biomathematics

Background:

• Infertility and embryonic mortality significantly impact the commercial broiler industry's economic viability, directly affecting hatchability rates.
• Embryonic mortality in chickens is not random but exhibits distinct patterns, typically occurring in two characteristic phases during incubation.

Purpose of the Study:

• To develop a mathematical model for assessing infertility in chicken eggs.
• To characterize the temporal distribution of embryonic mortality throughout the incubation period.
• To provide a tool for understanding management and genetic influences on hatchability.

Main Methods:

• A multiphasic mathematical model was constructed, incorporating literature-based evidence of distinct embryonic mortality phases.
• The model includes parameters for infertile eggs, fertile eggs with embryonic death, and specific mortality distributions within two phases.
• White Cornish chicken embryonic mortality data were utilized to demonstrate and validate the model's application.

Main Results:

• The developed multiphasic model allows for easy estimation and clear biological interpretation of parameters related to infertility and embryonic mortality.
• Parameter estimates derived from the model were generally precise and aligned with existing scientific literature.
• The model effectively characterizes the distribution of embryonic mortality over time, identifying peak mortality days and phase durations.

Conclusions:

• The multiphasic model offers a robust method for assessing infertility and detailing embryonic mortality patterns in chickens.
• This analytical approach can enhance understanding of both management practices and genetic factors influencing hatchability components.
• Accurate characterization of embryonic mortality is crucial for improving reproductive efficiency in commercial poultry operations.