[Nitrogen metabolism in growing swine receiving a bacterial protein supplement (Alcaligenes eutrophus) instead of soybean meal].
In a balance trial with 10 pigs (mean body mass 50 kg) the influence of a bacterial protein supplement (Alcaligenes eutrophus) on N-metabolism was investigated. The bacteria were included into the diet at levels of 7 and 14% at the expense of extracted soyabean meal. Thus bacterial "pure protein" (bacterial non-nucleic acid N X X 6.25) amounted to 30 and 60% of the protein of the ration. Consuming 2 kg of feed dry matter per day the animals of the control group (I) and the experimental groups (II and III) ingested 48 g, 52 g and 55 g of total N respectively. The difference in N-intake is explained by the additional nucleic acid-N, amounting to 19,8% of total bacterial N. Daily weight gain (on average 1054 g) and feed conversion efficiency (feed ingested/weight gain; on average 1,9) were relatively improved at the highest dietary level of bacterial cell mass. Faecal N-excretion was increased significantly, whereas renal N-excretion remained unchanged. Mean apparent N-digestibility was 87,4% showing no significant difference between the experimental groups. N-balance values were noticibly increased following the intake of the bacterial protein supplement. The excretion of urinary urea-N was slightly reduced whereas 4-6 times as much allantoin-N was excreted when bacteria were fed. It is calculated that about 80% of the bacterial purines are renally excreted as allantoin and uric acid.
D000421:Alcaligenes; D000818:Animals; D001426:Bacterial Proteins / Q000008:administration & dosage / Q000378:metabolism*; D001835:Body Weight; D004044:Dietary Proteins / Q000008:administration & dosage / Q000378:metabolism*; D008297:Male; D009584:Nitrogen / Q000378:metabolism*; D013025:Glycine max; D013552:Swine / Q000378:metabolism*
D001426:Bacterial Proteins; D004044:Dietary Proteins; D009584:Nitrogen
N-Stoffwechsel wachsender Schweine bei Austausch von Sojaextraktionsschrot durch einen bakteriellen Proteinträger (Alcaligenes eutrophus).