The digestibility of dried microbial cells grown on methanol in diets for growing pigs

Abstract

SummaryA microbial cell product was compared with fish meal at three levels of dietary inclusion, using barley as the basal diet. Digestibility coefficients for flash-dried microbial cells (DMC) were calculated to be 0·85 for gross energy and 0·91 for N. Digestible energy (DE) values were 18·8 MJ DE/kg D.M. for DMC and 16·5 MJ DE/kg D.M. for the fish meal. Digestible nitrogen (DN) values were 119 g DN/kg D.M. for the DMC protein and 108 g DN/kg D.M. for the fish meal. The metabolizable energy (ME) values for diets containing DMC were similar to those for diets containing fish meal; ME/DE for diets containing about 16·5% crude protein was 0·96. Microbial N was less efficiently utilized than fish meal N; this was largely attributed to the different contents of nucleic acid N.

Nutritive value of Eurolysine bacterial protein and Pekilo protein for growing pigs

“…The digestibilities of Eurolysine and Pekilo were rather low in these experiments compared with the results reported from previous trials with bacterial protein and Pekilo or some yeasts. The crude protein digestibilities usually recorded are 80-90 % (SCHULZ and OSLAGE 1976, D'MELLO et al 1976, WHITTEMORE and MOFFAT 1976, BRAUDE et al 1977, HANSEN 1981, SALO and PEKKARINEN 1981. However, HANSEN (1981) also obtained rather low values with Pekilo, 67.9 % for digestible crude protein, and with bacterial protein, 62,5 % for digestible organic matter.…”

“…1979). The Eurolysine bacterial mass has a high content of crude protein and is also rich in lysine. Numerous experiments have been conducted with SCP of various origins as a protein source for pigs, and promising results have been achieved with bacterial protein (D'MELLO et al 1976, WHITTEMORE and MOFFAT 1976, BRAUDE et al 1977, HANSEN 1981. In Finland Pekilo protein and Torula yeast, produced on sulphite spent liquor, have been investigated as protein supplements for pigs with good results (ALAVIUHKOLA et al 1975, 1979, SALO and PEKKARINEN 1981.…”

Bioefficacy of L-lysine sulfate compared with feed-grade L-lysine•HCl in young pigs

“…known as dried microbial cells), differences in performance may be observed. Whittemore and Moffat (1976) determined that dried microbial cells contained 4,475 kcal of DE/kg and 12% digestible N for pigs. Ammerman (1995) defined bioavailability as the "degree to which an ingested nutrient in a particular source is absorbed in a form that can be utilized in metabolism by the animal."…”

Evaluation by digestibility, growth and slaughter of microbial cells as a source of protein for young pigs

“…The considerable potential of bacterial cells as an alternative to conventional protein sources for pigs is becoming more clear, [1][2][3] although definitive conclusions regarding nutritive value cannot yet be drawn from the limited information available.…”

“…Comprehensive chemical analyses for DMC have been given recently el~ewhere.~-~ The high BV is as would be expected from the contents of the essential amino acids; particularly lysine, threonine, methionine f cystine, and tryptophan which are present at the respective concentrations of 45.8, 39.8, 24.7 and 7.7 g/kg dry matter (DM).4Despite a nucleic acid content in the region of 24 g nucleic acid N/kg DM, it appears that DMC might be of rather higher nutritional value than some other single cell protein sources tested, and at least of equivalent value to fish meal. [3][4][5] The nutritional qualities apparent from chemical analyses and digestibility studies indicate DMC to be particularly appropriate for inclusion in the diets of young growing pigs, although the rather low digestibility values of Schulz and Oslage,5 in contrast to those of D'Mello et aZ.,4 raise an element of doubt. Further, on account of its high nutrient demand and susceptability to dietary inadequacies, the young pig is particularly suitable for nutritive evaluation by growth and slaughter study.…”