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A new methods for testing quality of food proteins for maintenance metabolism 4. investigation of isolated proteins as well as some protein sources of plant or animal origin



A new methods for testing quality of food proteins for maintenance metabolism 4. investigation of isolated proteins as well as some protein sources of plant or animal origin



Archiv fuer Tierernaehrung 31(11-12): 739-752



Male adult rats (370 g body wt) were fed on maintenance level (460 kJ ME(metabolic energy)/kg 0.75). In a 10-day preliminary period they received a casein/methionine diet (95.5, wt/wt) supplemented with 10 mg 15N excess/0.178 kg metabolic body wt in form of ammonium acetate. Thereafter the animals were changed on 8 isonitrogenous diets containing as protein sources casein, soya protein, gelatin, whole egg, fish meal, pea, wheat and yeast. The 15N excretion via urine and feces 6-10 days after the end of labeling was used to evaluate the dietary proteins for maintenance. 15N in urine was lowest in animals fed with the wheat diet and highest after feeding the whole egg diet. From these data a so-called 15N excretion BV (biological value) was calculated, which indicated the highest quality for wheat and soy protein in meeting the needs of the intermediary metabolism in maintenance. Dietary protein sources influence the loss of endogenous N as metabolic fecal N (MFN). It was lowest in animals fed with diets containing isolated proteins (6 mg MFN/100 g body wt) and highest after feeding protein sources of plant origin with a high content in crude fiber (10 mg MFN/100 g). Both loss of 15N via urine and via feces were combined in a parameter called total BV. According to this parameter, the differences in quality for maintenance were small between the protein sources tested (casein 100, soy protein 100, pea 99, wheat 99, whole egg 92, fish meal 89, gelatin 89). In maintenance the supply of indispensable amino acids is not critical and the supply of dispensable amnino acids (or nonspecific N) is of great importance.

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