title: Short communication: Partial replacement of ground corn with algae meal in a dairy cow diet: Milk yield and composition, nutrient digestibility, and metabolic profile.
abstract: This study was undertaken to evaluate the effects of partially replacing dietary ground corn with a microalgae meal from Prototheca moriformis (composed of deoiled microalgae and soyhulls) on milk yield and composition, nutrient intake, total-tract apparent digestibility, and blood profile of lactating dairy cows. Twenty multiparous Holstein cows (57.7±49.4d in milk, 25.3±5.3 of milk yield, and 590±71kg of live weight at the start of experiment, mean ± standard deviation) were used in a cross-over design experiment, with 21-d periods. Diets were no microalgae meal (CON) or 91.8g/kg of microalgae meal partially replacing dietary ground corn (ALG). Cows showed similar milk yield and composition. The 3.5% fat-corrected milk production was 30.2±1.34kg/d for CON and 31.1±1.42kg/d for ALG. Despite cows having similar dry matter intake, ALG increased neutral detergent fiber and ether extract intake. In addition, cows fed ALG exhibited higher ether extract digestibility. No differences were detected in glucose, urea, amino-aspartate transferase, and gamma-glutamyl transferase blood concentrations. Feeding ALG increased the total cholesterol and high-density lipoprotein in blood compared with CON. The microalgae meal may partially replace ground corn in diets of lactating cows without impairing the animal's performance.
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil.
authors.forename: G G
authors.initials: GG
authors.lastname: da Silva
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil.
authors.forename: E
authors.initials: E
authors.lastname: Ferreira de Jesus
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil.
authors.forename: C S
authors.initials: CS
authors.lastname: Takiya
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil.
authors.forename: T A
authors.initials: TA
authors.lastname: Del Valle
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil.
authors.forename: T H
authors.initials: TH
authors.lastname: da Silva
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil.
authors.forename: T H A
authors.initials: THA
authors.lastname: Vendramini
authors.affiliation: TerraVia Holdings Inc., 225 Gateway Blvd., South San Francisco, CA 94080.
authors.forename: Esther J
authors.initials: EJ
authors.lastname: Yu
authors.affiliation: Department of Animal Nutrition and Production, University of Sao Paulo, Pirassununga 13635-900, Brazil. Electronic address: francisco.renno@usp.br.
authors.forename: F P
authors.initials: FP
authors.lastname: Rennó
mesh_terms: D000821:Animal Feed; D000818:Animals; D002417:Cattle; D004032:Diet / Q000662:veterinary; D004063:Digestion; D005260:Female; D007774:Lactation; D055442:Metabolome; D008892:Milk / Q000378:metabolism*; D012417:Rumen / Q000378:metabolism; D003313:Zea mays
keywords: coproduct; energy source; feedstuffs; soyhulls