Reference

Protein quality of food yeasts and metabolism of their purines by rats

Protein quality of food yeasts and metabolism of their purines by rats. Sarwar, G.; Peace, R. W.; Botting, H. G. (Health Prot. Branch, Bur. Nutr. Sci., Ottawa, ON K1A 0L2, Can.). Nutr. Rep. Int., 34(5), 709-20 (English) 1986. CODEN: NURIBL. ISSN: 0029-6635. DOCUMENT TYPE: Journal CA Section: 18 (Animal Nutrition) Section cross-reference(s): 17 Growth and purine metab. in rats fed inactive dried food yeasts were studied. The six yeast products were produced from two organisms (Candida utiliz; Saccharomyces cerevisiae) grown on different substrates. Relative net protein ratio (RNPR) values (casein + methionine = 100) of diets contg. 8% crude protein (N ′ 6.25) from the yeast products were 40-69%. Supplementation with methionine [63-68-3] (0.2%) caused substantial improvement in protein quality of all the yeast diets (RNPR values = 79-86%) but supplementation with cystine [56-89-3] (0. 73-24-5 and 56-89-3 which are cas registry numbers of substances are two of reagents here.2%) was less effective (RNPR values = 68-81%). Feeding of the yeast (20% protein) diets instead of casein resulted in reduced growth rate (30-80%), increased urine vol. (up to 3.5 times) and increased levels of allantoin [97-59-6] in plasma and urine (up to 2.5 times). Protein quality and renal excretion of purine metabolites were affected by species of yeast, autolysis and/or growth of yeasts on different substrates. .

Urea as a supplemental nitrogen source in feed mixtures containing natural or protected bean protein

Urea as a supplemental nitrogen source in feed mixtures containing natural or protected bean protein. Pisulewski, Pawel; Antoniewicz, Anna (Zakl. Zywienia Zwierzat, Inst. Zootech., Krakow, Pol.). Zesz. Probl. Postepow Nauk Roln., 192, 23-9 (Polish) 1977. CODEN: ZPPRAW. DOCUMENT TYPE: Journal CA Section: 18 (Animal Nutrition) The efficiency of utilization of urea [57-13-6] was compared in sheep fed diets contg. unchanged or rumen-protected broad bean protein. The main N sources were: broad bean (I), protected broad bean (II), broad bean + urea (III) and protected broad bean + urea (IV); urea accounted for 30% of the total N. Ammonia N levels in rumen fluid and N balance results showed that substituting 30% of the total protein in diet IV with urea was possible without changing N utilization. A decrease of N retention was obsd. in group II and III, caused by poorer digestibility of protected broad bean protein (II) and higher losses of N in urine (III). Feeding protected broad beans to sheep did not reduce the extent of microbial protein synthesis in the rumen, as was shown by diurnal urine allantoin [97-59-6] excretion.