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Animals are inherently social beings, and their survival, reproduction, and overall well-being depend greatly on appropriate social interactions within their species. An abnormal social environment, such as early maternal separation, social isolation, overcrowding, or inappropriate grouping, disrupts natural behavioural development and physiological homeostasis. Animal Welfare Science recognizes that welfare extends beyond physical health to include emotional state, behavioural freedom, and the ability to perform species-specific behaviours. Scientific evidence demonstrates that adverse social environments produce long-lasting effects on brain development, endocrine function, immune competence, learning ability, and social behaviour. Effective management and environmental enrichment can significantly reduce these harmful consequences and improve animal welfare across farm, laboratory, companion, zoo, and wildlife settings. Early maternal separation is one of the most extensively studied social stressors. In mammals, mothers provide nutrition, warmth, protection, grooming, and opportunities for social learning. Separation during sensitive developmental periods deprives offspring of these essential experiences. Young animals separated prematurely often exhibit elevated stress responses due to increased activity of the hypothalamic-pituitary-adrenal (HPA) axis. Cortisol or corticosterone concentrations remain persistently high, indicating chronic stress. Prolonged activation of stress hormones negatively affects growth, metabolism, cardiovascular function, and brain development. Maternal deprivation also alters neurological development. Brain regions responsible for emotional regulation, learning, and memory, such as the hippocampus, amygdala, and prefrontal cortex, may develop abnormally. Changes in neurotransmitters including serotonin, dopamine, and gamma-aminobutyric acid influence anxiety, aggression, impulsivity, and social competence. These neurobiological alterations often persist into adulthood, demonstrating that early-life experiences have lifelong welfare consequences. Behaviourally, maternally separated animals frequently display increased fearfulness, anxiety, and abnormal repetitive behaviours. Calves separated immediately after birth often vocalize excessively, search persistently for their mothers, and show reduced feeding behaviour. Laboratory rodents separated ____ _______ _____ _________ ____ _________ ______.
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