Performance of growing finishing swine fed diets containing algae produced on swine lagoon effluent

Harrison, M.D.; Walker, W.R.; Lincoln, E.P.; Combs, G.E.

Nutrition Reports International 33(5): 769-776


ISSN/ISBN: 0029-6635
Accession: 006083135

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Effcts of including algae cultured on swine lagoon effluent were examined at levels up to 16% in diets of growing-finishing (GF) swine (180 pigs). The Genus of algae predominant in the culture was Synechocystis (experiment 1) and Chlorella (experiments 2 and 3). Algae were harvested via flocculation with aluminum sulfate (alum) and sun dried. Crude protein (CP) and ash content of the Synechocystis and Chlorella algae were 22.0, 24.9 and 21.0, 34.9%, (As Fed) respectively. Principal mineral components of the Chlorella and Synechocystis algae were aluminum (10.25 and 7.93%) and phosphorus (5.01 and 5.56%), respectively. There was a linear reduction (P < .05) in average daily gain (ADG) when algae were added to the diet in each of three experiments. Average daily feed intake (ADF), however, was similar (P > .05) for GF pigs fed 5, 10, and 15% dietary algae. There was a linear reduction (P < .05) in feed to gain ratio (FE) for GF pigs fed diets with increasing levels of algae. Method of harvest and cultural control of algal species are proposed as two means of improving feeding value of algal product.