Animal Molecular Breeding 2024, Vol.14, No.3, 207-216 http://animalscipublisher.com/index.php/amb 213 breeders should strike a balance between aesthetic traits and temperament traits, avoiding the pursuit of extreme behaviors or appearances at the expense of the animal's overall adaptability and welfare. This principle is especially applicable to birds as well. When selecting specific traits for breeding, breeders need to consider whether these traits might lead to increased stress or aggressive behaviors in captive environments. Over time, some extreme aesthetic traits, such as specific feather colors or body sizes, may be associated with undesirable behavioral traits, which could negatively impact the bird's health and quality of life. Thus, establishing a breeding standard that balances aesthetics with good temperament is crucial for ensuring the welfare of birds. Figure 2 Exploratory factor analysis (Adopted from Morrill et al., 2022) Image caption: (A) The exploratory factor analysis categorized behavioral issues into 8 inferred factors, corresponding to underlying behavioral tendencies (blue: negative scores; red: positive scores). (B) The relationship between behaviors and breed in the context of size (Adopted from Morrill et al., 2022) 9 Concluding Remarks The research on the heritability of temperament traits in pet birds has yielded several significant insights. Firstly, temperament traits such as exploration behavior in novel environments have been shown to be moderately heritable, with both genetic and environmental factors contributing to phenotypic variance. In cockatiels, both trait-nomination-and-ratings and direct behavioral observation methods have been effective in identifying and describing temperament traits, with the former showing higher internal consistency. Additionally, a study on African Grey Parrots and Amazon Parrots identified two reliable temperament traits—anxiety/vigilance and curiosity/neophilia-demonstrating species-specific differences and high consistency over time. Future research should focus on expanding the range of bird species studied to include a broader phylogenetic spectrum, which could provide deeper insights into the evolutionary aspects of temperament traits. Longitudinal studies that track changes in temperament traits over extended periods and across different environmental conditions would be valuable. Additionally, integrating genetic analyses with behavioral studies could help in pinpointing specific genetic markers associated with temperament traits. Finally, exploring the impact of
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