Avaliação de indicadores para estimar a digestilidade dos nutrientes em novilhos Nelore alimentados com dietas contendo alto teor de concentrado e fontes nitrogenadas
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Data
2004
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Resumo
Six Nellore bulls, with initial body weight of 420 kg, were used to evaluate cromium oxide determined by X-ray
fluorescence as an external markers of digestibility. Cromium oxide was compared to internal indicators: indigestible NDF (NDFi)
incubated in vitro for 144 hours and acid detergent lignin and total feces collection. Digestibility coefficients of DM, OM, NDF, ADF,
CP and EE were estimated. Experimental diets were: 1) soybean meal, in a RDP deficient diet; 2) urea; 3) starea (non protein nitrogen
source supposedly of slow release), both diets with adequate RDP. Experimental diets were composed of 80% of concentrate and 20%
of forage (in natura sugarcane bagasse) on dry matter basis. Digestibility estimation by using cromium oxide showed similar results with
total feces collection. Lignin determination was similar to feces collection when soybean was used; however, when urea and starea were
fed, the digestibility coefficient were underestimated. NDFi underestimated digestibility for all nitrogen sources. X-ray fluorescence
showed to be a promising technique for cromium determination. Internal markers, NDFi incubated in vitro for 144 hours and the acid
detergent lignin did not estimated the indigestible portion of the diet.
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Digestibilidade, Indicadores, FDNi, Lignina, Óxido de cromo, Markers, NDFi, Lignin, Cromium oxide, Digestibility
Citação
OLIVEIRA JUNIOR, Reinaldo Cunha de; PIRES, Alexandre Vaz; FERNANDES, Juliano José de Resende; SUSIN, Ivanete; SANTOS, Flávio Augusto Portela; NASCIMENTO FILHO, Virgílio Franco; ARAÚJO, Rafael Canonenco de. Avaliação de indicadores para estimar a digestilidade dos nutrientes em novilhos Nelore alimentados com dietas contendo alto teor de concentrado e fontes nitrogenadas. Revista Brasileira de Zootecnia, Viçosa, v. 33, n. 3, p. 749-758, 2004.