Digestibilidade de nutrientes em dietas de bovinos contendo uréia ou amiréia em substituição ao farelo de soja
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Data
2004-02
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Resumo
The objective of this experiment was to evaluate the effect of replacement of soybean meal by urea or
starea on nutrient digestibility and ruminal parameters in bulls. Six Nellore bulls, with 420 kg of initial body mass,
were used to evaluate the effects of replacing a true protein source (soybean meal), in a ruminal degradability
protein deficient diet, by urea or starea, both in a ruminal degradability protein adjusted diets, on nutrient
digestibility and ruminal parameters in beef cattle. In natura sugarcane bagasse was the only source of forage
(20% of dry matter). Soybean meal treatment reduced (P<0.05) dry matter intake compared with urea and starea
treatments. There was no difference between urea and starea treatments. There were no differences (P>0.05) in
dry matter, organic matter, non-fiber carbohydrates, ether extract and crude protein apparent digestibility (%)
among treatments. Acid detergent fiber and neutral detergent fiber digestibilities (%) were higher (P<0.05) for
urea and starea treatments. There was no treatment effect and interaction treatment x time (P>0.05) for pH values,
total rumen volatile fatty acid molar concentration and acetate, propionate, butyrate and acetate:proprionate
ratio. The molar concentration of valerate, isobutyrate, isovalerate and branched-chain fatty acid were higher
(P<0.05) for soybean meal treatment. There were no differences (P>0.05) between urea and starea. Total replacement
of soybean meal by urea or starea, adjusting ruminal degradability protein for beef cattle is practicable.
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Gado de corte, Rúmen, Proteína, Fibra, Alimentação animal, Beef cattle, Rumen, Protein, Fibres, Animal feeding
Citação
OLIVEIRA JUNIOR, Reinaldo Cunha de; PIRES, Alexandre Vaz; SUSIN, Ivanete; FERNANDES, Juliano José de Resende; SANTOS, Flávio Augusto Portela. Digestibilidade de nutrientes em dietas de bovinos contendo uréia ou amiréia em substituição ao farelo de soja. Pesquisa Agropecuária Brasileira, Brasília, DF, v. 39, n. 2, p. 173-178, fev. 2004.