Collagen in the Heart of Wild and Domesticated Animals

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Abstract
The influence of domestication on the concentration of N2 and total hydroxyproline in the heart septum of wild and domesticated rats, ducks, rabbits and hares was studied. While the concentration of total hydroxyproline in the septum of domesticated rats gradually increases during aging, the concentration of total hydroxyproline does not change in wild rats and is markedly lower in older individuals than in the corresponding domesticated ones. The concentration of hydroxyproline was significantly lower in the septum of hares than in rabbits. In ducks no differences were found in the quantity of total hydroxyproline /dry weight of the heart septum and the musculus fibularis superficial; but in the lungs of wild ducks a significantly lower concentration of total hydroxyproline was found. The right ventricle contains a higher concentration of hydroxyproline than other parts of the heart.