Ingestive and metabolic behavior of beef cattle fed diets with different levels of turnip forage (Rhaphanus sativus) cake in replacement to soybean meal

Valdecir de Souza Castro, Leandro das Dores Ferreira da Silva, Ana Paula Souza de Fortaleza, Fernando Henrique Brussi Beran, Fernando Luiz Massaro Junior, Edson Luis Azambuja Ribeiro, Marco Aurélio Alves Freitas Barbosa, Valter Harry Bumbieris Junior, Ivone Yurika Mizubuti, Odimári Priscila Pires do Prado

Abstract


The objective of this study was to assess the effects of five substitution levels of soybean meal by turnip forage cake in the concentrate, on dry matter intake (DM), organic matter (OM), crude protein (CP), ether extract (EE), neutral detergent fiber (NDF) and acid detergent fiber (ADF), pH and ammonia nitrogen (N-NH3) in the rumen liquid and plasmatic urea nitrogen (PUN) in beef steer. The diets were isoprotein (6.5 % CP) and isoenergetic (50.0% TDN), using in natura sugarcane silage as the only forage (85,5 %DM). Five castrated males were used, 1/2 Simental x Nelore cross, with average weight of 610 kg and 36 months old, all fistulated in the rumen. The different levels of replacement were: 0, 25, 50, 75 and 100%, based on CP responsible of soybean meal of ration. Each experimental period lasted 19 days. The experiment was carried out in a 5x5 latin square experimental design, with five animals and five periods. The potential of dry matter intake (%BW and g/kg BW0,75) of turnip forage cake forage was obtained with 27% of replacement in the protean basis in relation to soybean meal, promoting, a maximum intake of 0,217 kg/animal/day, not proportionating alterations in the ruminal dynamic and in the blood.


Keywords


Ammonia nitrogen; Biodiesel; By-product; Intake; Plasmatic urea nitrogen; pH.



DOI: http://dx.doi.org/10.5433/1679-0359.2013v34n6Supl2p4167

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