title: Residual frying oil in the diets of sheep: intake, digestibility, nitrogen balance and ruminal parameters.
abstract: OBJECTIVE
  The objective of this study was to evaluate the intake and nutrient digestibility, nitrogen balance and ruminal ammonia nitrogen in lambs of diets containing different levels of residual frying oil.
  
  
  METHODS
  Levels of 0, 20, 40, 60, and 80 g/kg dry matter (DM) base of residual frying oil in the diets of lambs were evaluated. Five castrated lambs with initial body weights of 36.8±3.3 kg, distributed in a Latin square (5×5) design, were used.
  
  
  RESULTS
  There was a decreasing linear effect on the intake of DM, organic matter (OM), crude protein (CP), neutral detergent fiber (NDF), total carbohydrates (TCH), and nonfibrous carbohydrates (NFC). There was an increased linear intake of ether extract (EE). The apparent digestibility of DM, OM, CP, NDF, TCH, and NFC, as well as urine nitrogen excretion, nitrogen balance and ruminal parameters, were not influenced by different levels of residual frying oil in the diet. EE digestibility presented a crescent linear effect.
  
  
  CONCLUSIONS
  It can be concluded that the addition of residual frying oil to the diets of sheep can affect nutrient intake without affecting the digestibility of most nutrients (with the exception of EE), nitrogen balance and ruminal ammonia nitrogen concentration.
authors.affiliation: Faculty of Agricultural Sciences, Federal University of South and Southeast of Pará, Marabá, PA, CEP 68555-907, Brazil.
authors.forename: Eduardo Lucas Terra
authors.initials: EL
authors.lastname: Peixoto
authors.affiliation: Department of Animal Science, State University of Londrina, Londrina, PR, CEP 86.057-970, Brazil.
authors.forename: Ivone Yurika
authors.initials: IY
authors.lastname: Mizubuti
authors.affiliation: Department of Animal Science, State University of Londrina, Londrina, PR, CEP 86.057-970, Brazil.
authors.forename: Edson Luiz
authors.initials: EL
authors.lastname: de Azambuja Ribeiro
authors.affiliation: Department of Animal Science, State University of Londrina, Londrina, PR, CEP 86.057-970, Brazil.
authors.forename: Elizabeth
authors.initials: E
authors.lastname: Dos Santos Moura
authors.affiliation: Department of Animal Science, Federal University of Ceará, Fortaleza, CE, CEP 60021-970, Brazil.
authors.forename: Elzânia Sales
authors.initials: ES
authors.lastname: Pereira
authors.affiliation: Department of Animal Science, State University of Londrina, Londrina, PR, CEP 86.057-970, Brazil.
authors.forename: Odimari Pricila Pires
authors.initials: OP
authors.lastname: do Prado
authors.affiliation: Department of Animal Science, State University of Londrina, Londrina, PR, CEP 86.057-970, Brazil.
authors.forename: Larissa Nóbrega
authors.initials: LN
authors.lastname: de Carvalho
authors.affiliation: Department of Animal Science, State University of Londrina, Londrina, PR, CEP 86.057-970, Brazil.
authors.forename: Kássia Amariz
authors.initials: KA
authors.lastname: Pires
keywords: Alternative Feed; Byproduct; Feedstuff Energetic; Lambs; Lipid Source