Methods for the recovery of nutrients and energy from swine manure, 2: protein
1981
Boersma, L. | Gasper, E. (Oregon State Univ., Corvallis (USA). Dept. of Soil Science) | Oldfield, J.E. | Cheeke, P.R.
Tables 1 and 2 show combustible energy content of products involved in raising pigs from 50 to 100 kg. Values shown are for a one-year period with pigs being fed during 350 days. Protein consumption by the pigs and protein recovery from waste products are also shown. The tabulations shown here in combination with those of Part 1 indicate that the yield of biogas is reduced by inclusion of the fermenter. However, substantial quantities of protein can be produced. The relative advantages cannot be judged without a comparison of costs and benefits. These comparisons have not been made. Conclusions depend on the relative costs of energy and protein. Because difficulties are involved with algae production, not the least of which is the cost of production facilities, we favor the management scheme where straw is used in fermenter as well as digester, and growth of algae is not attempted.
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