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Effect of Feed Additives in Growing Lambs Fed Diets Containing Wet Brewers Grains

  • Aguilera-Soto, J.I. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas) ;
  • Ramirez, R.G. (Facultad de Ciencias Biologicas, Universidad Autonoma de Nuevo Leon) ;
  • Arechiga, C.F. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas) ;
  • Mendez-Llorente, F. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas) ;
  • Lopez-Carlos, M.A. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas) ;
  • Silva-Ramos, J.M. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas) ;
  • Rincon-Delgado, R.M. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas) ;
  • Duran-Roldan, F.M. (Unidad Academica de Medicina Veterinaria y Zootecnia, Universidad Autonoma de Zacatecas)
  • Received : 2007.12.12
  • Accepted : 2008.03.17
  • Published : 2008.10.01

Abstract

The study was conducted to evaluate and compare the effects of feed additives on ruminal fermentation, nutrient digestibility and performance of lambs fed diets containing 60% wet brewers grains (WBG). In Experiment 1, two simultaneous trials were conducted. Fifty intact ($20.2{\pm}0.8kg\;BW$) lambs were used in a feedlot trial and 10 (rumen cannulated; $32{\pm}1kg\;BW$) in a digestion trial. The pH, volatile fatty acids (VFA) and ammonia-N in lambs were also estimated. Lambs were randomly assigned to one of five diets: i) without additives (Con), ii) with 1% bicarbonate (Bic), iii) with 1% bentonite (Ben), iv) with 33 mg/kg monensin (Mon) and v) with 200 mg/kg fibrolityc enzymes (Enz). In Experiment 2, 120 RambouilletPelibuey intact male lambs ($19.5{\pm}1.5kg\;BW$) were used in a feedlot trial and randomly assigned to four diets: i) without additives (control), ii) with 1% Bic, iii) with 33 mg/kg Mon and iv) with 1% Bic and 33 mg/kg Mon. In Experiment 1, lambs fed diets containing Bic or Mon had significantly higher final weight, DMI, ADG than other lambs. However, apparent DM, OM, CP, NDF and ADF digestibilities and ruminal individual VFA content were similar (p>0.05) among treatments. Conversely, treatmentcollection period interaction was significant for ruminal pH and NH3. In Experiment 2, lambs fed diets containing a Bic and Mon combination had significantly higher final weight, DMI and ADG. It is concluded lambs fed Bic or Mon or Bic and Mon combination had better performance characteristics than lambs on Ben or Enz.

Keywords

Feed Additives;Sheep;Wet Brewers Grains

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