Resumen :
El bienestar animal está relacionado con la sensibilidad al estrés y a las enfermedades, así como con la resiliencia. Este estudio tiene como propósito analizar los marcadores plasmáticos relacionados con la respuesta inmunitaria en conejos para entender mejor su bienestar. La investigación se ha c... Ver más
Animal welfare is related to sensitivity to stress and disease, as well as resilience. This study aims to analyze plasma markers related to immune response in rabbits to better understand their welfare. The research has focused on two lines of rabbits divergently selected for resilience, with the aim of identifying significant differences and possible underlying mechanisms contributing to variability in litter size. Resilience has been measured as within-female variability in litter size. The hypothesis is that the line of rabbits with low variability in litter size (low line) has a higher adaptability to environmental changes, resulting in a better immune response to disease compared to the line of rabbits with high variability in litter size (high line). The main objective of this study is to characterize the hematological profiles of the two lines of rabbits divergently selected for resilience by analyzing white blood cell, red blood cell, and platelet counts. Additionally, the immune responsiveness of the two lines at two crucial times in their reproductive life, first mating and first parturition, was also investigated. The results obtained showed significant differences in hematological parameters and weight between lines, sex (males and females), season (autumn, winter, spring), and physiological state (first mating and first parturition). Differences between the low and high lines showed that the high line had a higher white blood cell count and a lower neutrophil percentage compared to the low line. Males had higher values for red blood cell count, hemoglobin, hematocrit, white blood cell count, and percentage of lymphocytes than females. Seasonal differences indicated that red blood cell counts, hemoglobin, hematocrit, and platelet counts were lower in spring than in autumn and winter, possibly due to increased pathogen proliferation in spring. In addition, it was observed that, after parturition, females experienced a reduction in red blood cell count, hemoglobin concentration, and hematocrit, along with an increase in white blood cell count and neutrophil percentage, reflecting the physiological stress of parturition. These findings highlight the importance of considering multiple factors when assessing the hematological health and general welfare of rabbits
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