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Metabolism and ruminal parameters of Holstein × Gir heifers fed sugarcane and increasing levels of crude protein

dc.contributor.authorQueiroz, Maria Fernanda Soares [UNESP]
dc.contributor.authorBerchielli, Telma Teresinha [UNESP]
dc.contributor.authorSignoretti, Ricardo Dias
dc.contributor.authorRibeiro, Andressa Ferreira [UNESP]
dc.contributor.authorMorais, Juciléia Aparecida da Silva [UNESP]
dc.contributor.institutionUniversidade Estadual Paulista (Unesp)
dc.contributor.institutionAgência Paulista de Tecnologia dos Agronegócios (APTA)
dc.date.accessioned2014-05-20T13:18:38Z
dc.date.available2014-05-20T13:18:38Z
dc.date.issued2012-09-01
dc.description.abstractThe objective of this study was to evaluate the effect of increasing levels of crude protein (CP) in the diet (13, 15, 19 and 22 g/100 g of dry matter, DM) on the metabolism and ruminal parameters of crossbred heifers fed forage sugarcane. Four crossbred Holstein x Gir heifers of average initial weight of 200 kg and average age of 14 months were used. The experimental design was in a 4 x 4 latin square. The intake values of DM, organic matter (OM), neutral detergent fiber (NDF) and non-fibrous carbohydrates (NFC) were not affected by the protein contents of the diet. The apparent and ruminal digestibility of DM and OM were affected by the protein content of the diet. Greater total apparent digestibility coefficient of CP (0.749) was observed for the content of 22 g CP/100 g DM, whereas the ruminal digestibility of CP was not affected by treatments. The efficiency of microbial protein synthesis was not different between the CP contents of the diet. There was increasing linear effect of the CP content in the diet on the plasma concentration of urea. The rumen pH of the heifers was similar between treatments, with an average of 6.3. The concentration of rumen ammonia nitrogen was affected by the protein content of the diet, with the highest averages at 22 and 19 CP/100 g DM (27.5 and 31.6 mg/dL); an average of 21.1 mg/dL in the diet with 15 g CP/100 g DM; and the lowest average observed in the diet containing 13 g CP/100 g DM, 14.0 mg/dL. It is recommended to use 13 g CP/100 g DM in the diet for crossbred Holstein x Gir heifers in the post-weaning phase consuming diets based on sugarcane, because this level promotes increase in the digestibility of the diet and lower concentrations of plasma urea nitrogen and ammonia nitrogen, showing better animal metabolism, in addition to a possible decrease in the cost of the diet.en
dc.description.affiliationUniv Estadual Paulista, Fac Ciencias Agr & Vet, São Paulo, Brazil
dc.description.affiliationAPTA Reg Alta Mogiana, Colina, SP, Brazil
dc.description.affiliationUnespUNESP Faculdade de Ciências Agrárias e Veterinárias
dc.description.sponsorshipFundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP)
dc.format.extent2101-2109
dc.identifierhttp://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000900019&lng=en&nrm=iso&tlng=en
dc.identifier.citationRevista Brasileira de Zootecnia. Sociedade Brasileira de Zootecnia, v. 41, n. 9, p. 2101-2109, 2012.
dc.identifier.doi10.1590/S1516-35982012000900019
dc.identifier.fileS1516-35982012000900019.pdf
dc.identifier.issn1516-3598
dc.identifier.lattes5317385915649516
dc.identifier.scieloS1516-35982012000900019
dc.identifier.urihttp://hdl.handle.net/11449/130434
dc.identifier.wosWOS:000311562800019
dc.language.isoeng
dc.publisherSociedade Brasileira de Zootecnia
dc.relation.ispartofRevista Brasileira de Zootecnia
dc.relation.ispartofsjr0,337
dc.rights.accessRightsAcesso aberto
dc.sourceSciELO
dc.subjectDigestibilityen
dc.subjectMicrobial synthesisen
dc.subjectPlasma ureaen
dc.subjectProtein fractionationen
dc.titleMetabolism and ruminal parameters of Holstein × Gir heifers fed sugarcane and increasing levels of crude proteinen
dc.typeArtigo
dcterms.licensehttp://www.scielo.br/revistas/rbz/paboutj.htm
dcterms.rightsHolderRevista Brasileira Zootecnia Brazilian Journal Animal Sci
dspace.entity.typePublication
unesp.author.lattes5317385915649516
unesp.author.orcid0000-0002-8026-7324[2]
unesp.campusUniversidade Estadual Paulista (UNESP), Faculdade de Ciências Agrárias e Veterinárias, Jaboticabalpt
unesp.departmentZootecnia - FCAVpt

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