Evaluation of single cell protein from pulp mills: laboratory analyses and in vivo digestibility.

摘要: Single cell protein (SCP) derived from secondary clarifiers of pulp mills is a potential commercial supplement in many areas. Samples SCP were collected several the Pacific Northwest and evaluated by laboratory procedures. Six vivo digestion trials conducted to determine relative nutritive value that was dewatered centrifugation or addition polyacrylamide polymer before being put through belt press dried with sonic dehydrator. Amino acid analyses showed higher methionine than cottonseed meal (CSM) had similar level lysine. True protein, based upon amino acids recovered samples, ranged 51.6 65.9% crude (CP). Pepsin digestibility CP 16.2 36.8%. increased 6.3 11.3 percentage units when incubated buffered rumen fluid for 24 hours. Solubility nitrogenous components 10% Burroughs' buffer solution 12.4 36.5%. The range mineral composition : P, .62 1.55%; Ca, .14 .99%; K, .21 5.52%; Mg, .07 .59%. concentration trace minerals heavy metals varied considerably sample sample. Digestion sheep compare CSM; 20 50% total provided sources. digestibilities centrifuged polymer-dewatered 70.5 70.8% 66.3 69.9%, respectively, observed CSM. In all trials, consumed diets readily, no digestive disturbances observed. On basis results, mill has be viable livestock.