Ontogeny of the corticotrophin-releasing hormone system in slow- and fast-growing chicks (Gallus gallus).

Abstract excerpt

Selective breeding has caused striking phenotypic differences among chickens. For example, the broiler, a fast-growing phenotype, is a relatively heavy bird selected for meat production while the layer, a slower-growing, lighter bird, was developed for egg production. Broilers are prone to early obesity and show physiological and behavioural differences in response to stressors compared with layers. However, the...

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