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vol.40 issue12Centesimal composition and sensorial analysis of Morada Nova lambs fed diets containing melon fruit in substitution of corn grainTotal and partial digestibility and nitrogen balance in grazing cattle supplemented with non-protein and, or true protein nitrogen during the rainy season author indexsubject indexarticles search
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Revista Brasileira de Zootecnia

On-line version ISSN 1806-9290

Abstract

COSTA, Viviane Aparecida Carli et al. Intake and rumen dynamics of neutral detergent fiber in grazing cattle supplemented with non-protein nitrogen and, or true protein during the rainy season. R. Bras. Zootec. [online]. 2011, vol.40, n.12, pp.2805-2814. ISSN 1806-9290.  http://dx.doi.org/10.1590/S1516-35982011001200027.

The objective of this study was to evaluate the effect of different true protein:non-protein nitrogen ratios in supplements on intake and ruminal transit and degradation dynamics of neutral detergent fiber (NDF) in grazing cattle during rainy season. Five crossbred Holstein × Zebu steers, averaging 335±35 kg of body weight and fitted with rumen and abomasum canullaes were used. The treatments were: control (only pasture), and supplements based on urea, 2/3 of nitrogenous compounds from urea and 1/3 of nitrogenous compounds from albumin, 1/3 of nitrogenous compounds from urea and 2/3 of nitrogenous compounds from albumin, and albumin. Two hundred grams/d of crude protein (CP) were supplied from supplements. The experiment was carried out according to a 5 × 5 Latin square design, with five 15-day experimental periods. There were no effects of supplementation on voluntary intake, except for CP intake, which was increased by supplementation. The replacement of urea by albumin in the supplements caused linear effect on the CP intake. The intakes of the other diet components were not affected by the supplement composition. There was no effect on ruminal rate of passage of fibrous compounds. Supplementation increased the estimates of common rate of lag and degradation of NDF. However, no effect of supplement composition alteration was observed on this parameter. Supplementation of cattle with rumen degradable (protein or non-protein) nitrogenous compounds for grazing cattle during rainy season does not affect voluntary intake of pasture.

Keywords : albumin; pasture intake; supplementation; urea.

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