Sugar cane supplemented with urea levels: rumen fermentation and plasma urea-N concentrations in dairy cows

Matarazzo, S.V.; Mattos, W.R.S.; Sucupira, M.C.A.; Stacchini, P.F.; Simas, J.M.C. de; Pires, A.V.

Boletim de Industria Animal 63(3): 143-149

2006


Accession: 017204790

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Abstract
Four cows fitted with rumen cannulae were used in a 4x4 Latin square design to investigate the rumen fermentation and the plasma urea-N concentration. The animals were fed with sugarcane as the exclusive roughage and supplemented with soyabean meal in the treatment 0%UR or urea at levels of 1.0, 1.5 and 2.0% of fresh sugarcane. Daily dry matter intake was higher (P<0.05) for treatment 0%UR (7.76 kg DMI/day) than treatment 1.0%UR (4.94 kg DMI/day), 1.5%UR (5.53 kg DMI/day) and 2.0%UR (4.02 kg DMI/day). The pH, total volatile fatty acids concentrations, the percentage of acetic and propionic acids, acetic:propionic ratio and ammonia concentrations showed quadratic effect (P<0.05) between 0-10 and 12-22 h. Differences were observed (P<0.05) among the treatments in both periods for the ammonia and plasma urea-N concentrations. There were treatment effects (P<0.05) on pH and acetic:propionic ratio between 12-22 h.