Aging and Food Restriction

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Abstract
Two groups of male chickens started at one day of age to be fed standard rations, one group being permitted to eat ad libitum whereas the other was restricted on the basis of 80% of the amount of feed consumed by the first group at a similar body weight. Throughout the 3-year study there was a significant difference in body weight between the restricted and nonrestricted groups. The carcass composition at the end of the 3-year period was the same for both groups. The hydroxyproline content of skin, liver, muscle, comb and aorta was studied and a peak in concentration was observed between 1 and 3 months of age. In the case of certain tissues (muscle and comb) a further increase occurred between 1 and 3 years. A difference between restricted and full-fed birds in hydroxyproline content was observed only for abdominal aortic tissue at the 6 and 12 months sampling periods, with the restricted birds showing a significantly higher hydroxyproline content. At the final sampling period (38 months) the full-fed birds had higher abdominal cholesterol concentrations than the restricted birds, but on a dry, fat-free basis, there was little difference in hydroxyproline of the aorta. This last observation suggested a difference in lipid content of the aorta at 6 and 12 months.

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