Single cell protein
Description and recommendations
|IMPORTANT INFORMATION: This datasheet is pending revision and updating; its contents are currently derived from FAO's Animal Feed Resources Information System (1991-2002) and from Bo Göhl's Tropical Feeds (1976-1982).|
In some regions single cell protein could become the principal protein source that is used for domestic livestock, depending upon the population growth and the availability of plant feed protein sources. This could develop because microbes can be used to ferment some of the vast amounts of waste materials, such as straws; wood and wood processing wastes; food, cannery and food processing wastes; and residues from alcohol production or from human and animal excreta. Producing and harvesting microbial proteins is not without costs, unfortunately. In nearly all instances where a high rate of production would be achieved, the single cell protein will be found in rather dilute solutions, usually less than 5 % solids.
A wide range of substrates can be used to grow microbial proteins (5)(AGRIS 1998-005657)(Kuhad, 1997). Various materials can be used as a substrate for producing single cell protein (whey, orange peel residue, sweet orange residue, sugarcane bagasse, paper mill waste, rice husks, wheat straw residue, cassava waste, sugar beet pulp, coconut waste, yam waste, banana pulp, mango waste, grape waste, sweet potato, (A)(CAB N215145)(Vaccarino, 1989); (B)(CAB M550935) (Swaminathan, 1989);(G)(CAB M457080)(Bajpai, 1988); (D)(CAB D319281)(Mathur, 1988); (E)(CAB M507533)(Nwabueze, 1987); (F)(CAB M507592)(El-Shawarby, 1987), (H)(CAB M470931)(Khaled, 1985); (I)(CAB N175836)(Pandey, 1988), (J)(CAB N175844)(Aderiye, 1988), (N)(CAB M389417)(Aker, 1987), (U)(CAB N918111)(Kahlon, 1986), (V)(CAB M693710)(Manilal, 1991), (W)(CAB M694368)(Malathi, 1989), (X)(CAB M681401)(Kuzmanova, 1990), (Y)(CAB D455606)(Zayed, 1991), (AA)(CAB M625510)(El-Refai, 1990), (AC)(CAB N274192)(Bugarski, 1988), (AD)(CAB N266858)(Guo, 1989), (AE)(CAB N252423)(Rashad, 1990), (AH)(CAB 940311026)(Rodriguez, 1993), (AK)(CAB 971300120)(Yulinery, 1995).
Methods available for concentrating include, filtration, precipitation, coagulation, centrifugation, and the use of semi-permeable membranes. These de-watering methods require equipment that is quite expensive and would not be suitable for most small-scale operations. Removal of the amount of water necessary to stabilize the material for storage, in most instances, is not currently economical. Single cell protein must be dried to about 10 % moisture, or condensed and acidified to prevent spoilage from occurring, or fed shortly after being produced.
Microbial protein has a high nucleic acid content, so levels need to be limited in the diets of monogastric animals.
Tables of chemical composition and nutritional value
Pulpmill single cell protein was demonstrated to be a viable supplemental protein source for sheep (M)(CAB N035279)(Atil, 1987). It was found that up to 75 % of the total dietary protein can be provided by single cell protein while maintaining normal performance in lambs (6)(AGRIS 89-120973)(Mohammed, 1986).
Single cell protein was a suitable supplemental protein source for lactating dairy goats (Q)(CAB N910498)(Mudgal, 1986). Milk production and milk production efficiency was increased when single cell protein replaced groundnut meal in lactating goat diets (10)(AGRIS 87-023672)(Mudgal, 1986).
DATASHEET UNDER CONSTRUCTION. DO NOT QUOTE. http://www.feedipedia.org/node/673 Last updated on March 16, 2010, 16:13