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Journal of Nutrition Vol. 91 No. 4 April 1967, pp. 468-472
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Relationship between Serum Protein Level and Body Composition in the Chick1,2,

O. P. Thomas and G. F. Combs

Department of Poultry Science, University of Maryland, College Park, Maryland

Studies were conducted with 10-day-old chicks to determine the effect of varying the protein and energy intake on body composition, serum protein levels and the relationship between body composition and serum protein levels. Diets first-limiting in lysine as well as those calculated to be adequate in all the essential amino acids were used. Birds were pair-fed at each protein level to control the energy intake. Fat, moisture, and protein analyses were made on the carcasses of fasted whole birds at the end of a 15-day feeding period. Blood samples were drawn from the chicks not killed for the carcass composition analyses and analyzed for total proteins and albumins. When the dietary protein level was reduced without changing the energy level, both total serum protein and albumin levels were reduced. However, when the daily energy allowance was reduced without changing the protein intake, there was a rise in both total serum protein and albumin levels. There is a very high correlation between either total serum protein or albumin levels and body composition data. The data suggest that serum protein or albumin levels may serve as an index of body composition at a given age.

1 This investigation was supported in part by Public Health Service Research Grant no. AM-08224 from the National Institutes of Health. Scientific Article no. A-1310, Contribution no. 3854 of the Maryland Agricultural Experiment Station, Department of Poultry Science.

2 A portion of a dissertation presented by the senior author as partial fulfillment of requirements for the Ph.D. degree to the Graduate School of the University of Maryland.

Manuscript received 26 October 1966.




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