Grazing management strategies for massaigrass-forage peanut pastures: 2. productivity, utilization and sward structure

Revista Brasileira de Zootecnia

Carlos Mauricio Soares De Andrade²  Rasmo Garcia¹  Judson Ferreira Valentim²  Odilon Gomes Pereira¹ 

[1] ,Embrapa AcreRio Branco AC

关键词: Arachis pintoi;    defoliation intensity;    grazing depth;    legume;    morphological composition;    Western Amazon;    Amazônia Ocidental;    Arachis pintoi;    composição morfológica;    intensidade de desfolha;    leguminosa;    profundidade de pastejo;   

DOI  :  10.1590/S1516-35982006000200003

来源: SciELO

【 摘 要 】

This study was carried out to evaluate the productivity, utilization and sward structure of a mixed massaigrass (Panicum maximum x P. infestum, cv. Massai) and forage peanut (Arachis pintoi Ac 01) pasture, intermittently stocked at three daily herbage allowance levels (9.0, 14.5 and 18.4% of live weight). In each grazing cycle, dry matter (DM) accumulation rates, defoliation intensity (%), grazing depth (%) and grazed horizon (cm) were evaluated. The structure of massaigrass tussocks was characterized in both dry and rainy seasons by measuring its pre-grazing morphological composition and post-grazing height and density (tussocks/m). Pastures submitted to higher herbage allowance (HA) levels showed higher productivity, but were less efficiently utilized. On average, over the experimental period, DM accumulation rates increased linearly from 56.8 to 81.3 kg/ha/day as HA levels increased from 9.0 to 18.4% of live weight. However, defoliation intensity and grazing depth declined linearly with increasing HA levels. During the dry season, pre-grazing morphological composition of massaigrass was characterized by 41% of green leaf blades, 10% of pseudostems and 49% of dead material, irrespective of HA levels. In the rainy season, however, it showed higher percentage of green leaf blades and lower percentage of pseudostems when submitted to lower HA levels, although there were not differences in relation to percentage of dead material. The structure of massaigrass tussocks tended to deteriorate at high HA levels.

【 授权许可】

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