Substituição total do farelo de soja por uréia ou amiréia, em dietas com alto teor de concentrado, sobre a amônia ruminal, os parâmetros sangüíneos e o metabolismo do nitrogênio em bovinos de corte
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Data
2004
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Resumo
Six Nellore bulls, with initial body weight of 420 kg, were assigned to a duplicated 3x3 Latin square design to evaluate
the effects of replacing a true protein source (soybean meal), of high biological value, in a rumen degradable protein (RDP) deficient diet,
by urea or starea (a supposedly slow release nonprotein nitrogen source), both in a RDP adjusted diet. In natura sugarcane bagasse as
the only source of forage (20% of DM). Evaluated parameters were: rumen ammonia-N concentration, plasma urea-N, glucose and nitrogen
balance. Experimental treatments were: 1) soybean meal (SBM); 2) urea and 3) starea (A-150S). Diets were isonitrogen (13% CP). The
rumen ammonia-N concentration was higher in the treatment with urea, compared to the treatment with SBM, and starea showed no
difference compared to the others. Starea had higher loss of urinary N. N retention (g/d and % of consumed) and protein biological value
(N retention, % of N digestible) were higher for urea treatment, compared to the others. There was no difference on plasma urea-N and
glucose concentration among treatments. Total replacement of SBM by urea, adjusting PDR in diets for growing beef cattle, demonstrated
to be viable. Conventional urea showed advantage compared to starea.
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Amiréia, Amônia ruminal, Balanço de nitrogênio, Parâmetros sanguíneos, Starea, Blood parameters, Nitrogen balance, Ruminal ammonia-N, Beef cattle
Citação
OLIVEIRA JUNIOR, Reinaldo Cunha de; PIRES, Alexandre Vaz; FERNANDES, Juliano José de Resende; SUSIN, Ivanete; SANTOS, Flávio Augusto Portela; ARAÚJO, Rafael Canonenco de. Substituição total do farelo de soja por uréia ou amiréia, em dietas com alto teor de concentrado, sobre a amônia ruminal, os parâmetros sangüíneos e o metabolismo do nitrogênio em bovinos de corte. Revista Brasileira de Zootecnia, Viçosa, v. 33, n. 3, p. 738-748, 2004.