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Arquivo Brasileiro de Medicina Veterinária e Zootecnia
Print version ISSN 0102-0935
PROHMANN, P.E.F. et al. Method of sampling and chemical characterization of forage intake by cattle in pasture ryegrass intercropping oats. Arq. Bras. Med. Vet. Zootec. [online]. 2012, vol.64, n.4, pp. 953-958. ISSN 0102-0935. http://dx.doi.org/10.1590/S0102-09352012000400023.
The experiment was conducted to study different methods of pasture sampling, to estimate the chemical composition of the diet of Holstein steer, and grazing pasture of oat (Avena strigosa Schreb)and ryegrass (Lolium multiflorum Lam). The methods evaluated were Clipping Close by Soil (CCS), Hand-Plucking (HPL) and Rumen Evacuation (REV). The averages for crude protein (CP), total digestible nutrients (TDN), neutral detergent fiber (NDF) and acid detergent fiber (ADF) were 9.7, 62.2, 64.5 and 33.1% for the CCS treatment; 9.8, 65.4, 59.6 and 30.0% for HPL, and 11.4, 70.8, 51.6 and 25.5% for REV, respectively. There was no statistical difference between CCS and HPL methods, however, in relation to the REV method, both underestimated protein and energy concentration, and overestimated the amount of cell walls in the diet. The conclusion is that rumen evacuation may be an adequate method to characterize the diet consumed by steers on oats and ryegrass pastures.
Keywords : chemical composition; hand-plucking; nutritive value; rumen evacuation.