Effects of autolysis and hydrolysis of bacterial protein meal grown on natural gas on chemical characterization and amino acid digestibility

Schøyen, H; Frøyland, J. R. K.; Sahlstrøm, Stefan; Knutsen, Svein Halvor; Skrede, Anders

doi:10.1016/j.aquaculture.2005.04.017

Cited by 28 publications

(23 citation statements)

References 10 publications

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“…The explanation as to why the present study found that BPM consumption resulted in slightly lower apparent digestibility of N than those resulting from SBM consumption may be that M. capsulatus, in addition to the cell walls, contains a complex system of poorly digestible internal membranes. This is in accordance with a higher N digestibility in a membrane-reduced extract of autolysed BPM than the crude autolysed BPM (Schøyen et al, 2005).…”

Section: Discussionsupporting

confidence: 85%

Bacterial protein meal in diets for growing pigs: effects on protein and energy metabolism

Hellwing¹,

Tauson²,

Kjos

et al. 2007

Animal

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This experiment investigated the effects of increasing the dietary content of bacterial protein meal (BPM) on the protein and energy metabolism of pigs from weaning to a live weight of 80 kg. Four litters with four castrated male pigs in each litter were used. The litters were divided into two blocks according to age. One pig from each litter was fed one of the four experimental diets. Soya-bean meal was replaced with BPM on the basis of digestible protein, and the BPM contents in the four diets were 0% (BP0), 5% (BP5), 10% (BP10) and 15% (BP15), corresponding to 0%, 17%, 35% and 52% of the digestible nitrogen (N), respectively. Four balance periods were performed, at the start of which the pigs weighed 9.5 kg, 20.7 kg, 45.3 kg and 77.2 kg, respectively. Once during each balance period, 22-h respiration experiments were performed using indirect calorimetry. Daily weight gain, feed intake and feed conversion rate were the same for all diets. The apparent digestibility of N was lower on diet BP10 than on BP0 (P ¼ 0.002), whereas the apparent digestibility of energy was similar on all diets. The retention of nitrogen did not differ between diets and was 1.50, 1.53, 1.33 and 1.46 g N per kg 0.75 per day on BP0, BP5, BP10 and BP15, respectively. Neither metabolisable energy intake nor heat production were affected by inclusion level of BPM. Retention of energy was 620 (BP0), 696 (BP5), 613 (BP10) and 664 kJ/kg 0.75 per day (BP15), the differences among diets being non-significant. The N-free respiratory quotient was similar on all diets. It was concluded that the overall protein and energy metabolism in growing pigs were not affected when up to 50% of dietary N was derived from BPM.

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Section: Discussionsupporting

confidence: 85%

Bacterial protein meal in diets for growing pigs: effects on protein and energy metabolism

Hellwing¹,

Tauson²,

Kjos

et al. 2007

Animal

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“…The apparent CP digestibility of BPMG (Table 3) was similar to values obtained by Skrede et al (1998), but slightly lower than found by Schøyen et al (2005) when using BPM from an industrial-scale production plant. The use of methanol as growth medium (BPMM) rather than natural gas (BPMG) resulted in higher apparent and true CP digestibility, whereas nucleic acid reduction had no effect on CP digestibility.…”

Section: Resultssupporting

confidence: 76%

“…The amino acid digestibilities of an extract from autolysed BPM with reduced content of membranes have been shown to be higher than those of a crude autolysed BPM (Schøyen et al, 2005). This suggests that poor digestibility of membranebound amino acids contributed to the rather low digestibility of some amino acids in BPMG.…”

Section: Resultsmentioning

confidence: 99%

“…This suggests that poor digestibility of membranebound amino acids contributed to the rather low digestibility of some amino acids in BPMG. Vesicle formation of membrane fractions and proteins embedded in the membranes may render amino acids unavailable for digestion (Schøyen et al, 2005). The peptidoglycans in the cell wall of bacteria may be resistant to proteases due to the presence of D-amino acids.…”

Section: Resultsmentioning

confidence: 99%

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Effects of growth substrate and partial removal of nucleic acids in the production of bacterial protein meal on amino acid profile and digestibility in mink

Skrede¹,

Mydland²,

Øverland³

2009

J. Anim. Feed Sci.

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Effects of growth substrate and nucleic acid reduction in the production of bacterial protein meal (BPM) were studied using a bacteria culture containing mainly Methylococcus capsulatus (Bath). BPM were produced on natural gas (>90% methane) (BPMG), methanol (BPMM), or methanol followed by nucleic acid reduction (BPMM-NAR). BPMG and BPMM had similar crude protein (CP) and amino acid contents, whereas BPMM-NAR had slightly higher CP and amino acid contents. Digestibility of CP and amino acids in mink was higher for BPMM than for BPMG. Tryptophan revealed the greatest difference in true digestibility (70.5% for BPMG vs 89.5% for BPMM) and lysine the least difference (93.2% for BPMG and 95.7% for BPMM). There were no differences in CP or amino acid digestibility between BPMM and BPMM-NAR. It was concluded that BPM grown on methanol gave higher digestibility of CP and amino acids than natural gas, probably due to lower proportion of bacterial intracellular membrane protein.

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“…Bacterial protein meal produced from natural gas has similar amino acid composition to fish meal (Skrede et al 1998;Storebakken et al 2004;Skrede and Ahlstrøm 2004), but is generally higher in tryptophan and lower in lysine. The amino acid digestibility of bacterial protein meal in mink is characterized by high digestibility of lysine and arginine, low digestibility of cysteine, and intermediate digestibility of tryptophan (75%) (Skrede et al 1998;Schøyen et al 2005).…”

mentioning

confidence: 99%

Effect of dietary bacterial protein or L-tryptophan supplementation on welfare and growth performance in silver fox

Schøyen

Rouvinen‐Watt²,

Höglund³

et al. 2007

Can. J. Anim. Sci.

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. 2007. Effect of dietary bacterial protein or Ltryptophan supplementation on welfare and growth performance in silver fox. Can. J. Anim. Sci. 87: 93-102. The suitability of bacterial protein meal as a feed ingredient in silver fox diets was examined in an experiment comprising 72 juvenile silver foxes. Bacterial protein meal has a high content of tryptophan, which is the precursor for the neurotransmitter serotonin. The biological hypothesis on which this study was premised was that increased brain serotonin production reduces the fear response, which may lead to better welfare and performance through lower energy expenditure related to fear-induced defensive responses. The effect of substituting 15% fish meal with bacterial protein meal was measured by two behavioural tests, growth performance and fur quality, by comparison with a control diet and a diet supplemented with a high level of synthetic tryptophan. The welfare of the foxes fed the diet supplemented with synthetic tryptophan was considered to be improved, as they used shorter time to approach feed in the presence of a person; thus displayed less fear, than the other two groups after treatment. Weight gain of the foxes during 55 d did not differ among diets, and feed consumption was similar. Live grading of the foxes showed that the dietary treatments did not affect fur quality (P > 0.05). It is concluded that 15% bacterial protein meal can replace fish meal in dry silver fox diets and that a large supplement of tryptophan reduces fear of silver foxes kept in cages.Key words: Bacterial protein meal, tryptophan, serotonin, silver fox, welfare, performance Schøyen, H. F., Rouvinen-Watt, K., Höglund, E., Stone, K. P. et Skrede, A. 2007. Incidence des protéines unicellulaires et d'un supplément de L-tryptophane sur la santé et la croissance du renard argenté. Can. J. Anim. Sci. 87: 93-102. Les auteurs ont tenté de voir l'utilité de la poudre de protéines unicellulaires pour l'alimentation du renard argenté en effectuant une expérience sur 72 renardeaux. La poudre de protéines unicellulaires est très riche en tryptophane, précurseur de la sérotonine, un neuromédi-ateur. L'hypothèse biologique sur laquelle reposait l'étude est qu'une plus grande production de sérotonine dans le cerveau devrait rendre l'animal moins craintif, avec l'amélioration de la santé et du rendement que cela suppose en raison de la plus faible dépense d'énergie imputable aux mécanismes de défense induits par la peur. Les chercheurs ont remplacé 15 % de farine de poisson par de la poudre de protéines unicellulaires et ont mesuré les effets de ce changement grâce à deux tests comportementaux, au taux de croissance et à la qualité de la fourrure, en comparant les résultats à ceux obtenus avec la ration témoin et une ration fortement enrichie de tryptophane synthétique. Les renards recevant le supplément de tryptophane étaient en meilleure santé, car les animaux mettaient moins de temps à s'approcher de la nourriture en présence d'un humain. Ils affichaient donc moins de crainte que les d...

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Effects of autolysis and hydrolysis of bacterial protein meal grown on natural gas on chemical characterization and amino acid digestibility

Cited by 28 publications

References 10 publications

Bacterial protein meal in diets for growing pigs: effects on protein and energy metabolism

Bacterial protein meal in diets for growing pigs: effects on protein and energy metabolism

Effects of growth substrate and partial removal of nucleic acids in the production of bacterial protein meal on amino acid profile and digestibility in mink

Effect of dietary bacterial protein or L-tryptophan supplementation on welfare and growth performance in silver fox

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