Intake, ruminal parameters and plasmatic urea concentration in beef cattle fed diets with different levels of sunflower cake in substitution to the cotton meal

Adriana Rosa Domingues, Leandro das Dores Ferreira da Silva, Edson Luis de Azambuja Ribeiro, Valdecir de Souza Castro, Marco Aurélio Alves de Freitas Barbosa, Rinaldo Masato Mori, Mariana Torres Licursi Vieira, Janaína Aparecida de Oliveira da Silva

Abstract


The objective of this study was to assess the effects of five substitution levels of cotton meal by sunflower cake in the concentrate ration, on dry matter intake (DMI), pH and ammonia nitrogen (N-NH3) in the rumen liquid and plasmatic urea in beef steers.  The diets were isoprotein (13.0% CP) and isoenergetic (72.0% TDN). In natura sugarcane silage was the only ronghage (40% DM). Five 1/2 Simental x Nelore, castrated males were used, with average weight of 380 kg and 24 months old, all fistulated in the rumen.  The treatments were: 0% sunflower cake (TG0); 25% sunflower cake (TG25); 50% sunflower cake (TG50); 75% sunflower cake (TG75); and 100% sunflower cake (TG100), based on DM, substituting cotton meal (FA). The experiment was carried out in a 5x5 Latin square experimental design, with five animals and five periods. Each experimental period lasted 15 days. The dry matter intake (DMI) presented significant difference (P < 0.05), showing that substituting cotton meal by sunflower cake resulted in lower DM intake, but this substitution did not (P > 0.05) alter the pH and N-NH3 values of the rumen liquid and plasmatic urea values.  It was concluded that sunflower cake can be used in substitution to the cotton meal when mean daily gains are expected, since in high levels of substitution it caused a decrease in DMI.


Keywords


Sugar cane. Ammonia nitrogen. Steer. pH



DOI: http://dx.doi.org/10.5433/1679-0359.2010v31n4p1059

Semina: Ciênc. Agrár.
Londrina - PR
E-ISSN 1679-0359
DOI: 10.5433/1679-0359
E-mail: semina.agrarias@uel.br
Este obra está licenciado com uma Licença Creative Commons Atribuição-NãoComercial 4.0 Internacional