The aim of the current study is to assess three integrated systems presenting different eucalyptus tree densities due to animal and forage production. The following integrated systems were assessed: croplivestock-forest with 357 eucalyptus trees ha -1 (ICLF1); crop-livestock-forest with 227 eucalyptus trees ha -1 (ICLF2); and crop-livestock with 5 remnant native trees ha -1 (ICL). The randomized block experimental design was applied in a split-plot scheme with four replicates. The Average Daily Gain (ADG, g animal -1 day -1 ) and the live-weight gain per area (LWG, kg ha -1 ) were applied to analyze animal performance, which was set by weighing the animals every 28 days (the animals previously fasted for 16h). Forage yield was higher in ICL during fall and winter; in summer, it did not differ from ICLF2. There was no forage yield difference between the ICL and ICLF2 systems in any of the assessed seasons; summer was more productive in ILPF1 than other seasons. The highest leaf crude protein contents (CP) in summer was recorded in systems ICLF1 and ICLF2, and the highest value recorded in fall was found in ILPF1; the lowest was found in ILP. On the other hand, the highest leaf NDF contents in summer were found in ILP. The highest ADG were found in summer. The highest LWG values recorded for the ICL and ICLF2 systems were collected in summer and fall; there was no difference in any of the three systems in winter. The LWG was higher in all system in summer. The ICLF2 emerged as the system (with trees) most appropriate for beef cattle production. Despite the shading interference on forage production, such condition is compensated by the best nutritional contents such as CP. The ICLF2 system allowing an annual LWG of 83% in relation to the ICL system during the fifth year of establishment of the systems. Key words: Piatã grass. Tree density. Eucalyptus. Crop-livestock-forest integration. Forage yield. ResumoObjetivou-se avaliar três sistemas de integração com diferentes densidades de árvores de eucalipto quanto à produção forrageira e animal. Foram avaliados os sistemas de integração: lavoura-pecuária-floresta, com 357 árvores de eucalipto ha -1 (ILPF1); lavoura-pecuária-floresta, com 227 árvores de eucalipto ha -1 (ILPF2) e lavoura-pecuária, com cinco árvores nativas remanescentes ha -1 (ILP avaliação da forrageira foi adotado o delineamento experimental em blocos casualizados, em esquema de parcelas (ILPF1, ILPF2 e ILP) subdivididas (verão, outono e inverno), com quatro repetições. Para avaliação do desempenho animal, foi utilizado o ganho médio diário (GMD) e ganho de peso vivo por área (GPV), obtidos por pesagens a cada 28 dias com jejum prévio de 16 horas. A produção forrageira foi maior no ILP nas três estações mas, no verão, não diferiu do ILPF2. De maneira geral, os maiores teores de proteína bruta foram encontrados no sistema ILPF1 e os maiores teores de FDN, no sistema ILP. Os maiores GMD (g animal -1 dia -1 ) foram no verão. Foram observados maiores GPV (kg ha -1 ) no verão e outono nos sistemas de...
Our objective was to measure chemical composition and anatomy of 5 Megathyrsus maximus (syn. Panicum maximum) genotypes, when grown in combination with eucalypts in a silvopastoral system. Cultivars Massai, Mombaça, BRS Tamani, Tanzânia and intraspecific hybrid accession PM44 were evaluated in full sun and a silvopastoral system at 5 different distances from eucalyptus tree rows. The experimental design was a randomized block in split plot with 2 replications. Plots corresponded with genotypes and subplots with sampling points within the system. Total forage and leaf biomass as well as nutritive value und tissue proportions were evaluated. Our results showed a decrease in biomass as radiation incidence decreased. Forage biomass was greatest in BRS Tamani and Mombaça and lowest in PM44. There was a significant interaction between sampling points and genotype for nutritive value variables, such as crude protein, in vitro digestibility of organic matter, cellulose, hemicellulose and lignin-S, while tissue proportions were not affected by the interaction between sampling points and genotypes. Genotype had more pronounced effects on chemical composition and anatomical characteristics than did sampling points. The leaves of Mombaça were the longest and had greatest total cross-sectional area, and this genotype showed greater proportions of sclerenchyma and vascular tissues than other cultivars and the lowest proportion of mesophyll. The greatest proportion of parenchyma bundle sheaths was also found in Mombaça leaves. Genotypes PM44 and Tanzânia had the lowest proportions of sclerenchyma, and PM44 and BRS Tamani had the lowest proportions of vascular tissues. On the other hand, PM44 and Tanzânia had the greatest proportions of mesophyll. BRS Tamani was comparable with the most used cultivars, Mombaça and Tanzânia, and had forage quality slightly superior to that of Mombaça. Tropical grasses growing under shade can potentially produce less forage but with better nutritive value, in terms of chemical composition and tissue proportions, than grasses grown under full sun. However, as the degree of shading in silvopastoral systems does not occur uniformly across the whole area, the improved nutritive value would not be uniform and may not be very prominent overall.
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