Animal Molecular Breeding 2024, Vol.14, No.3, 207-216 http://animalscipublisher.com/index.php/amb 211 on wild house sparrows demonstrated that nestling activity is affected by social brood effects, indicating that the early social environment can shape certain personality traits (Hope et al., 2022). Additionally, the stability of personality traits increases with age, suggesting that early life experiences contribute to the continuity and crystallization of these traits over time (Morinay et al., 2019). Figure 1 Temperament Test (Adopted from Ramos et al., 2023) Image caption: (a) Interaction between the parrot and the colored stick used as a novel object in the first novel object test; (b) Flight distance measurement performed after the unknown person reaction test; (c) Manual restraint test (Adopted from Ramos et al., 2023) 6.2 Impact of socialization and training Socialization and training are pivotal in the development of temperament traits in pet birds. The interaction with humans and other birds can lead to significant changes in behavior. For example, the study on the great tit (Parus major) highlighted that exploration behavior, a key temperament trait, is influenced by the environment, including local breeding density and habitat quality. This suggests that socialization and training, which alter the bird's environment, can have a profound impact on their temperament. Furthermore, the heritability of certain traits, such as boldness and exploration, can be modified by social contexts, emphasizing the importance of socialization in shaping these traits (Winney et al., 2018). 6.3 Gene-environment interactions The interaction between genetic predispositions and environmental factors is complex and significant in determining temperament traits. Research has shown that both genetic and environmental influences on personality traits increase in stability with age, indicating a dynamic interplay between these factors (Briley and Tucker-Drob, 2014). In humans, studies have identified numerous genes associated with temperament, which interact with environmental influences to shape behavior (Zwir et al., 2018). Similarly, in birds, the heritability of traits like exploration behavior is context-dependent, with environmental gradients playing a crucial role in the expression of these traits (Winney et al., 2018). This gene-environment interaction underscores the necessity of considering both genetic and environmental factors in the study of temperament. The temperament of pet birds is shaped by a combination of genetic predispositions and environmental influences. Early life experiences, socialization, and training play significant roles in the development and stability of these traits, while gene-environment interactions further complicate the picture, highlighting the need for a comprehensive approach to understanding avian temperament. 7 Case Study: Heritability of Temperament Traits in a Specific Pet Bird Species 7.1 Selection of species for case study For this case study, we selected the African Grey Parrot (Psittacus erithacus) and the Blue-Fronted Amazon Parrot (Amazona aestiva). These species were chosen due to their well-documented communicative and cognitive skills, which make them ideal candidates for studying temperament traits. Additionally, previous research has developed a reliable and valid temperament test for these species, providing a solid foundation for our analysis (Coutant et al., 2018).
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