Nitrogen Balance of Dogs Fed Lime‐Treated Corn Supplemented with Proteins and Amino Acids^a,b

Abstract

SUMMARY The effect on the nitrogen balance of young dogs of supplementing lime‐treated corn with small amounts of black bean flour, skim milk, fish flour, and torula yeast was investigated. Although the diets were kept isonitrogenous, all supplements increased nitrogen retention significantly, as did supplementing with lysine and tryptophan. The gain was most marked for skim milk, fish flour, and torula yeast plus lysine, and of sufficient magnitude to be of practical significance for human feeding. The better the protein quality of the supplement, the greater the decrease in nitrogen retention after its removal.

Small-Scale Integrated Agricultural Production Family Farm

“…Different products also have a similar essential amino-acid content, and can thus be easily interchanged without altering the nutritional value of the diet. The results show an expected improvement in the quality of the diet, as demonstrated by the higher nitrogen retention values [8]. A similar effect is observed in table 3 upon addition of 3 g of milk daily to a corn/bean diet [9,10] .…”

Sensory evaluation of maize tortillas supplemented with lysine and tryptophan / Evaluación sensorial de tortillas de maíz elaboradas con la adición de lisina y triptófano

“…Among these different approaches, direct free amino acid addition seems to be the simplest, and for this approach, the previous reports by Bressani are the most relevant (Bressani, 1969(Bressani, , 1977Bressani et al, 1963aBressani et al, , 1963bBressani et al, , 1968. These studies used rats, dogs and children as subjects, to evaluate the addition of free lysine and tryptophan to corn-based diets, either individually or in combination.…”

“…The levels of addition which yielded the best results were either 0.31% lysine and 0.05% tryptophan, or 0.41% lysine and 0.15'% tryptophan (Bressani et al, 1968). Studies with children aged between 2 and 5 years were made using the nitrogen balance technique, which provides information on nitrogen retained relative to nitrogen ingested, with corrections made to account for nitrogen excreted in faeces and urine (Bressani et al, 1963a;Bressani, 1969;Bressani, 1977). The nitrogen balance was improved when mixtures of the two limiting amino acids were added at levels of 0.56% of lysine and 0.35% DL-tryptophan.…”