title: Supplementation with Ca salts of soybean oil interacts with concentrate level in grazing dairy cows: milk production and milk composition.
abstract: In this study, we investigated the associative effects of concentrate levels and Ca salts of soybean oil (CSSO) supplementation on milk production, milk composition, and milk fatty acids of mid-lactation dairy cows grazing on tropical pasture. Twenty-four Jersey × Holstein cows were used in a randomized block design and assigned to four treatments arranged in a 2 × 2 factorial design. Factors evaluated were concentrate levels (low, 3 kg/day vs. high, 7 kg/day of concentrate) and CSSO supplementation (without CSSO vs. with 250 g CSSO cow/day). All cows grazed on elephant grass (Pennisetum purpureum cv. Cameroon) and received the supplemental treatments for a 90-day period. Interactions between concentrate level and CSSO were detected for milk yield, milk yield components, energy-corrected milk (ECM) and 3.5 % fat-corrected milk (FCM). Milk yield increased when CSSO was fed in a low concentrate level, while it decreased milk production in a high concentrate level. Yields of fat, protein, lactose, 3.5 % FCM, and ECM were not affected with CSSO in the low concentrate, but reduced in the high concentrate level. CSSO increased proportions of monounsaturated milk FA, C18:2 trans-10 cis-12, and polyunsaturated FA, and reduced proportions of saturated milk FA in milk. In conclusion, feeding the high level of concentrate was an effective strategy to improve milk yield and solid production. CSSO supplementation increased milk production when fed at low concentrate level but did not affect yield of solids.
authors: Department of Animal Science, University of São Paulo, Piracicaba, São Paulo, 13418-900, Brazil.
authors: Fernanda Lopes
authors: FL
authors: Macedo
authors: Department of Animal Science, University of São Paulo, Piracicaba, São Paulo, 13418-900, Brazil.|Department of Animal Science, Michigan State University, East Lansing, MI, 48824, USA.
authors: Jonas
authors: J
authors: de Souza
authors: Department of Animal Science, University of São Paulo, Piracicaba, São Paulo, 13418-900, Brazil.|Department of Animal Science, University of Illinois at Urbana-Champaign, Urbana-Champaign, IL, 81601, USA.
authors: Fernanda
authors: F
authors: Batistel
authors: Department of Animal Science, University of São Paulo, Piracicaba, São Paulo, 13418-900, Brazil.
authors: Lucas Jado
authors: LJ
authors: Chagas
authors: Department of Animal Science, University of São Paulo, Piracicaba, São Paulo, 13418-900, Brazil. fapsantos@usp.br.|, Padua Dias Av., Piracicaba, SP, Brazil, 13416-900. fapsantos@usp.br.
authors: Flávio Augusto Portela
authors: FA
authors: Santos
mesh_terms: D000821:Animal Feed / Q000032:analysis*; D000822:Animal Husbandry; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001938:Brazil; D002417:Cattle / Q000502:physiology*; D003612:Dairying; D004032:Diet / Q000662:veterinary*; D019587:Dietary Supplements; D005260:Female; D008892:Milk / Q000737:chemistry / Q000378:metabolism*; D012492:Salts; D013024:Soybean Oil / Q000008:administration & dosage*; D014329:Tropical Climate
chemical_list: D012492:Salts; D013024:Soybean Oil
keywords: Ca salts of soybean oil; Concentrate level; Dairy cows; Tropical pasture