Guilherme Rocha Moreira

Nutritional evaluation of “Braquiarão” grass in association with “Aroeira” trees in a silvopastoral system

This study aimed at evaluating the influence of a silvopastoral system (SPS) composed of “Aroeira” trees (Myracrodruon urundeuva) on the nutritional value of Brachiaria brizantha cv. Marandu forage grass over the rainy season. The experiment was conducted in the SPS located in the “Cerrado” biome in Lagoa Santa County, Minas Gerais state, Brazil, in the agricultural year of 2004–2005. It was evaluated the influence of “Aroeira”, whose density in the area was 140 trees/ha, on the following parameters of the B. brizantha cv. Marandu forage grass: forage mass harvest above stubble height, morphogenic attributes, bromatological composition and nutritional value. The effects of “Aroeira” trees on the micro-climatic conditions were also evaluated. The experiment adopted a randomized block design with five blocks (cutting seasons), two treatments (a shaded pasture—B. brizantha cv. Marandu shaded by M. urundeuva—and a pasture in full sun—B. brizantha cv. Marandu in full sun), and three replicates. The tree component, composed of the tree species M. urundeuva in the experimental density adopted, increased dry matter and crude protein of the forage mass harvest above stubble height, without affecting the concentration of neutral detergent fibre or acid detergent fibre, thus causing dry matter and organic matter in vitro degradability as well as effective degradability of the forage grass to remain the same as those obtained in full sun. Therefore, the results of this study show the possibility of using trees and grass to increase both animal production and environmental services.

Avaliação da Brachiaria brizantha cv. marandu em sistemas silvipastoris

In situ degradability of dry matter of Brachiaria brizantha cv. marandu harvested in two silvopastoral systems was evaluated. One system was composed by Zeyheria tuberculosa tree and the other by Myracrodruon urundeuva, both located at Brazilian Savannah, Lagoa Santa, MG. A completely ramdomized block experimental design in a splitplot arrangement was used. The treatments were allocated in the plots and the times in the splitplot. No effect of shade was observed for in situ dry matter degradability.

Evaluation of the infrared spectroscopy method for the quantification of NANOLIPE marker in feces of dairy cattle

LIPE® is an external marker obtained from lignin isolated from Eucaliptus grandis and enriched with phenolic groups that is used to estimate dry matter intake and digestibility (Saliba et al., 2003). Recently, methodological improvements in obtaining LIPE® led to the production of a newer and better version of this marker. Its particles have now reached the nano scale and for this reason it was called NANOLIPE (Saliba et al., 2012). The Fourier Transform Infrared Spectroscopy (FT-IR) is used for the quantification of NANOLIPE in feces. However, one of the key points to ensure the quality of the results is to assess the linearity of the calibration curves used in the determinations (Thompson, 2005). Therefore, the aim of this study was to statistically evaluate the linearity of the FT-IR method in quantifying NANOLIPE in feces of dairy cattle.

Avaliação nutricional de fenos produzidos com Andropogon gayanus cv. Planaltina

In this study Andropogon gayanus cv. Planaltina hay produced at different ages of growth (56, 84, 112 and 140 days) were used for degradability assay of in vitro dry matter using semi-automated in vitro gas production technique. The data of in vitro dry matter degradation was used for the fabrication of equations and used for parallelism and curve identification comparison tests. The comparison between the A. gayanus hays harvested at different ages of growth by parallelism test showed that degradability in vitro dry matter curves are parallel. The similar curves showed kinetic behavior for in vitro dry matter degradability. When compared, the A. gayanus hays harvested at different ages of growth through the curve identification test, showed that A. gayanus hays harvested between 56 and 84 days are similar and had higher in vitro dry matter degradability. Nutritionally superior A. gayanus hay cut plants are obtained at intervals of 56 to 84 days.

Cinética de fermentação ruminal in vitro da forrageira Brachiaria brizantha cv. Marandu em sistema silvipastoril

The influence of a silvopastoral system composed of Bolsa de Pastor (Zeyheria tuberculosa) on in vitro kinetics of ruminal fermentation of Brachiaria brizantha cv. Marandu was evaluated at Cerrado bioma, in the years 2006 and 2007. The silvopastoral was established in 1982, by natural regeneration of tree species in red-yellow oxisols. The trials on kinetics of ruminal fermentation were carried out in a split-plot design with three replicates. The silvopastoril system and the monoculture of Brachiaria were allocated as plots and the harvest periods as the split-plots. Kinetics of ruminal fermentation in the systems were similar. However, during the rainy season, the forage was highly fermentable in comparison to the transition season. The forage harvested during the dry season showed lower fermentability.

Cinética de degradação ruminal in situ da Urochloa brizantha cv. Marandu em sistema silvipastoril

This study aimed at evaluating the influence of a silvopastoral system (SPS) composed of Bolsa de Pastor (Zeyheria tuberculosa) on the following parameters of Urochloa brizantha cv. Marandu: kinetics of ruminal degradability in situ of the bromatological components dry matter (DM), organic matter (OM) e crude protein (CP) of the Marandu grass. The experiment was conducted in a SPS located in the Cerrado biome, in the city of Lagoa Santa, Minas Gerais state, Brazil. The silvopastoral system was established through natural regeneration of the tree species in red-yellow Oxisols in 1982. The trial on kinetic of ruminal degradation of bromatological components adopted a split-plot design, the treatment was composed by the systems studied (SPS and monocropping of Urochloa brizantha), and the plots were composed by the harvest periods during the year, with 3 replicates per treatment. The kinetics of ruminal degradation DM and OM was equivalent among the studied systems. The ruminal degradation kinetics of the CP of the forages in SPS was greater than in monocropping. However, during the wet season, all the bromatological components studied from the forages were highly fermentable compared to transition season, and the forage harvested during the dry season presented low fermentability. Cinética de degradação ruminal in situ da Urochloa brizantha cv. Marandu em sistema silvipastoril† In situ ruminal degradation kinetics of Urochloa brizantha cv. Marandu in silvopastoral system Luciano Fernandes Sousa1 Rogério Martins Maurício2 Guilherme Rocha Moreira3 Mauro Pereira de Figueiredo4 Jhone Tallison Lira de Sousa5 Thais Valéria Sousa Silva5*