Back-drawer: a behavioral mutant in Japanese quail

Area of Science:

• Animal Behavior Genetics
• Avian Genetics
• Developmental Biology

Background:

• The
• back-drawer
• is a behavioral mutant in Japanese quail characterized by specific abnormal movements.
• This mutation manifests early in development, affecting young birds significantly.
• Previous studies have not fully elucidated the genetic basis or phenotypic variations.

Purpose of the Study:

• To characterize the behavioral and survival phenotypes of the
• back-drawer
• mutant in Japanese quail.
• To investigate the reproductive capacity and lifespan of affected individuals.
• To determine the genetic mode of inheritance for this behavioral mutation.

Main Methods:

• Phenotypic observation and classification of affected quail from hatching to maturity.
• Assessment of fertility and reproductive success in male and female mutants.
• Genetic analysis to determine the inheritance pattern of the
• back-drawer
• trait.

Main Results:

• The
• back-drawer
• behavior includes crouching, neck-ventral bending, and occasional rolling, appearing from hatching to 8 weeks.
• Three distinct types of affected birds were identified based on onset and survival, with varying prognoses.
• Males showed temporary infertility during abnormality but recovered, while females had short lifespans and lacked reproductive ability.
• Genetic analysis revealed the mutant character is controlled by two pairs of autosomal recessive genes.

Conclusions:

• The
• back-drawer
• mutation in Japanese quail presents a complex phenotype with significant impacts on behavior, survival, and reproduction.
• The inheritance pattern suggests a polygenic basis involving two autosomal recessive gene pairs.
• Understanding this mutant provides insights into the genetic control of complex behaviors and developmental processes in birds.