Comparação de métodos para avaliação da massa de forragem em pastos de capim-estrela submetidos a intensidades de pastejo

• Ano de defesa: 2009
• Autor(a) principal: Arruda, Domenico Sales Rocha de
• Tipo de documento: Dissertação
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual de Maringá; Brasil; Departamento de Zootecnia; Programa de Pós-Graduação em Zootecnia; UEM; Maringá, PR; Centro de Ciências Agrárias
• Palavras-chave em Português: Forragem; Capim-estrela; (Cynodon nlemfuensis var; nelmfuensis); Bastão graduado; Disco medidor de forragem; Régua; Medidor de capacitância; Massa de forragem; Intensidade de pastejo; Valor nutritivo; Brasil.; Forage; Grass-star; Nelmfuensis) graduate .Bastão; Disk meter forage; Ruler; Capacitance meter; Herbage mass; Grazing intensity; Nutritional value; Brazil.; Ciências Agrárias; Zootecnia
• Link de acesso: http://repositorio.uem.br:8080/jspui/handle/1/1700

The objective of this study was to compare the methods that are most commonly used to indirect estimates of herbage mass as the sward stick (SS), the rising plate meter allowance (RP), the ruler and capacitance meter (MC) in grazed stargrass used in different hights of pasture. And get information on the characteristics of the pasture and the nutritional value of pasture stargrass (Cynodon nlemfuensis var. Nelmfuensis) used under conditions of continuous stocking. The design was completely randomized design with two replications and the treatments were four sward heights: five, 10, 15 and 20 cm. The height of stargrass on the picket line was maintained by adjustments in stocking rate using Nelore heifers. The evaluations were carried out in the pastures monthly periods, 07/11/2007 to 26/04/2008. In assessing the effectiveness of each method to quantify the MF was evaluated by the regression equation. The capacitance meter did not show consistent results. The values of coefficient of determination for assessment of herbage mass were low and less than 0.63 with the BG, DMF and the ruler. Measurements of forage mass in stargrass pasture under continuous stocking can be carried out preferably with the rising plate meter, with the sward stick or the ruler. For the evaluation of the pasture, the linear model best explained the relationship between the height of the pasture herbage mass, herbage mass green, green leaf mass, stem mass and the mass of dead material. Leaf: stem ratio and the proportion of green leaf in the sward structure were not influenced by sward height. The concentration of crude protein decreased linearly with increasing sward height, with values from 13.89 to 11.55 g/kg DM. The in vitro digestibility of organic matter was not influenced (P>0.05) by sward height and the average value obtained was 654.75 g/kg DM. Herbage mass, the proportion of green forage, stem and dead material are modified by the height of sward. Also the nutritional value of forage available is amended by sward heigh.