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  • Title: Effects of the source and level of protein fed to Syrian hamsters on growth, protein utilization, and selected blood proteins.
    Author: Birt DF, Schuldt GH.
    Journal: Lab Anim Sci; 1982 Aug; 32(4):357-62. PubMed ID: 7144108.
    Abstract:
    Syrian hamsters were fed diets formulated with casein, lactalbumin, and casein supplemented with L-methionine and L-cysteine for 3 weeks. Each protein source was fed at 4, 10, 20, and 40 g/100 g diet and supplied 3.4, 9, 17, and 34% protein. A protein-free diet was given to separate groups. Maximal growth rates were obtained at the 10, 20, and 40 g/100 g diet levels, and protein efficiency ratios showed maximal protein utilization with the 10 g/100 g diet level of each protein source. Net protein utilization was influenced by both protein source and level. In both sexes, casein was less well-utilized than either lactalbumin or supplemented casein when the protein sources were fed at the 4 or 10 g/100 g diet levels. Whole blood hemoglobin increased with increasing dietary protein levels, irrespective of protein source. Protein source influenced serum albumin concentrations in female hamsters at the 4 and 10 g/100 g levels and in male hamsters at the 40 g/100 g level. The highest albumin concentrations were observed in females fed 10 g lactalbumin/100 g diet or 20 or 40 g casein/100 g diet. Maximal concentrations of serum alpha one globulin were observed in female hamsters at the 4 or 10 g/100 g diet and in male hamsters at the 0 or 4 g/100 g levels. Serum beta globulins were influenced by protein level. The highest concentrations were observed in the animals fed 10 to 40 g protein source/100 g diet. Serum protein changes were not consistently related to differences in growth or protein utilization.
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