dc.creatorAQUINO, A. A.
dc.creatorLIMA, Yv. R.
dc.creatorBOTARO, B. G.
dc.creatorALBERTO, C. S. S.
dc.creatorPEIXOTO JR., K. C.
dc.creatorSANTOS, M. V.
dc.date.accessioned2012-10-20T01:41:19Z
dc.date.accessioned2018-07-04T15:29:08Z
dc.date.available2012-10-20T01:41:19Z
dc.date.available2018-07-04T15:29:08Z
dc.date.created2012-10-20T01:41:19Z
dc.date.issued2008
dc.identifierANIMAL FEED SCIENCE AND TECHNOLOGY, v.140, n.1/Fev, p.191-198, 2008
dc.identifier0377-8401
dc.identifierhttp://producao.usp.br/handle/BDPI/26879
dc.identifier10.1016/j.anifeedsci.2007.03.005
dc.identifierhttp://dx.doi.org/10.1016/j.anifeedsci.2007.03.005
dc.identifier.urihttp://repositorioslatinoamericanos.uchile.cl/handle/2250/1623529
dc.description.abstractThe aim of this study was to evaluate the effects of substituting soybean meal for urea on milk protein fractions (casein, whey protein and non-protein nitrogen) of dairy cows in three dietary levels. Nine mid-lactation Holstein cows were used in a 3 x 3 Latin square arrangement, composed of 3 treatments, 3 periods of 21 days each, and 3 squares. The treatments consisted of three different diets fed to lactating cows, which were randomly assigned to three groups of three animals: (A) no urea inclusion, providing 100% of crude protein (CP), rumen undegradable protein (RUP) and rumen degradable protein (RDP) requirements, using soybean meal and sugarcane as roughage; (B) urea inclusion at 7.5 g/kg DM in partial substitution of soybean meal CP equivalent; (C) urea inclusion at 15 g/kg DM in partial substitution of soybean meal CP equivalent. Rations were isoenergetic and isonitrogenous-1 60 g/kg DM of crude protein and 6.40 MJ/kg DM of net energy for lactation. When the data were analyzed by simple polynomial regression, no differences were observed among treatments in relation to milk CP content, true protein, casein, whey protein, non-casein and non-protein nitrogen, or urea. The milk true protein:crude protein and casein:true protein ratios were not influenced by substituting soybean meal for urea in the diet. Based on the results it can be concluded that the addition of urea up to 15 g/kg of diet dry matter in substitution of soybean meal did not alter milk protein concentration casein, whey protein and its non-protein fractions, when fed to lactating dairy cows. (c) 2007 Elsevier B.V. All rights reserved.
dc.languageeng
dc.publisherELSEVIER SCIENCE BV
dc.relationAnimal Feed Science and Technology
dc.rightsCopyright ELSEVIER SCIENCE BV
dc.rightsrestrictedAccess
dc.subjectdairy cow
dc.subjecturea
dc.subjectnon-protein nitrogen
dc.subjectmilk urea nitrogen
dc.subjectcasein
dc.subjectwhey protein
dc.titleEffects of dietary urea levels on milk protein fractions of Holstein cows
dc.typeArtículos de revistas


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