scholarly journals Signal Grass (Brachiaria decumbens) Toxicity in Grazing Ruminants

Agriculture ◽  
2015 ◽  
Vol 5 (4) ◽  
pp. 971-990 ◽  
Author(s):  
Susan Low
Keyword(s):  
Brachiaria Decumbens ◽  
Signal Grass

Localization and Chemical Speciation of Pb in Roots of Signal Grass (Brachiaria decumbens) and Rhodes Grass (Chloris gayana)

2008 ◽  
Vol 42 (12) ◽  
pp. 4595-4599 ◽  
Author(s):  
Peter M. Kopittke ◽  
Colin J. Asher ◽  
F. Pax C. Blamey ◽  
Graeme J. Auchterlonie ◽  
Yanan N. Guo ◽  
...  
Keyword(s):  
Chemical Speciation ◽  
Brachiaria Decumbens ◽  
Rhodes Grass ◽  
Chloris Gayana ◽  
Signal Grass

scholarly journals HERBICIDE SELECTIVITY TO SIGNAL GRASS AND CONGO GRASS

2017 ◽  
Vol 35 (0) ◽  
Author(s):  
A.H.C. ANÉSIO ◽  
M.V. SANTOS ◽  
R.R. SILVEIRA ◽  
E.A. FERREIRA ◽  
T.G.S. BRAZ ◽  
...  
Keyword(s):  
Electron Transport Chain ◽  
Block Design ◽  
Herbicide Application ◽  
Brachiaria Decumbens ◽  
Brachiaria Ruziziensis ◽  
Randomized Block Design ◽  
Transport Chain ◽  
Minas Gerais State ◽  
Signal Grass ◽  
Control Samples

ABSTRACT This study was conducted in order to evaluate the selectivity of signal grass and congo grass, submitted to post-emergence herbicide application. The experiment was conducted under greenhouse conditions, in Diamantina, Minas Gerais state, and it was arranged in a randomized block design, with five replications. Treatments were set in factor scheme (8 x 2) + 2. Eight herbicides (nicosulfuron; clomazone; glyphosate; fluazifop-p-butyl + fomesafen; lactofen; fomesafen; fluazifop-p-butyl and mesotrione) were applied in doses recommended by the manufacturer on two fodder species: Brachiaria decumbens cv. Basilisk (signal grass) and Brachiaria ruziziensis (congo grass); in addition, there were two control samples without herbicide application, for a total of 18 treatments. The evaluated herbicides showed less intoxication on signal grass when compared to congo grass. Nicosulfuron and glyphosate promoted higher intoxication on both species when compared to the other herbicides. Glyphosate, fluazifop-p-butyl + fomesafen, fluazifop-p-butyl, mesotrione and nicosulfuron affected the ratio variable / maximum fluorescence (Fv/Fm) in both species, indicating an effect provided by these herbicides on the electron transport chain. Results demonstrated that signal grass and congo grass have higher susceptibility to glyphosate, fluazifop-p-butyl + fomesafen, fluazifop-p-butyl, mesotrione and nicosulfuron. congo grass shows higher susceptibility to the studied herbicides when compared to signal grass.

Evaluation of a long-established silvopastoral Brachiaria decumbens system: plant characteristics and feeding value for cattle

2019 ◽  
Vol 70 (9) ◽  
pp. 814 ◽  
Author(s):  
Marina A. Lima ◽  
Domingos S. C. Paciullo ◽  
Fabyano F. Silva ◽  
Mirton J. F. Morenz ◽  
Carlos A. M. Gomide ◽  
...  
Keyword(s):  
Protein Content ◽  
Crude Protein ◽  
Nutritive Value ◽  
Production Systems ◽  
Crude Protein Content ◽  
Brachiaria Decumbens ◽  
Dairy Heifers ◽  
Feeding Value ◽  
Signal Grass ◽  
The Difference

One of the main challenges of using a silvopastoral system (SPS) is maintaining pasture and animal productivity over time. Our objective was to compare the productive characteristics and nutritive value of signal grass (Brachiaria decumbens cv. Basilisk) and the liveweight gain of dairy heifers in a SPS and open pasture (OP, signal grass under full sunlight) during the rainy seasons of four experiments between 2003 and 2016, which characterised systems from their 6th to 19th years after establishment in south-eastern Brazil when analysed together. The experimental design was a randomised complete block in a 2 × 4 factorial scheme (two production systems (SPS and OP) and four experiments (2003–2004, 2004–2007, 2011–2014 and 2014–2016)). From the 7th year onwards, the progressive reduction of photosynthetically active radiation negatively impacted the productive characteristics of the SPS pasture. Total forage mass was reduced by 19% in SPS compared with the OP in 2004–2007, 38% in 2011–2014 and 31% in 2014–2016. Crude protein content was 23% and 30% higher in the SPS than in the OP in 2011–2014 and 2014–2016, respectively. However, during the study period (until the 19th year), the liveweight gain of heifers was similar between systems since the higher crude protein content available in SPS contributed to improved forage nutritional value. From the 17th to the 19th year, weight gain per area was lower in the SPS compared with the OP (169 vs 199 kg ha–1), although the difference between systems was small. Signal grass presents a high degree of phenotypic plasticity in response to changes in shade levels, which gives this species a high potential for use in SPS.

scholarly journals Testing and validation of methods for the diagnosis and recomendation integrated system for Signal grass

2005 ◽  
Vol 62 (6) ◽  
pp. 520-527 ◽  
Author(s):  
Cristiane Prezotto Silveira ◽  
Gilmar Ribeiro Nachtigall ◽  
Francisco Antonio Monteiro
Keyword(s):  
Nutrient Solution ◽  
Correlation Coefficients ◽  
Integrated System ◽  
Brachiaria Decumbens ◽  
Leaf Analysis ◽  
R Value ◽  
Signal Grass ◽  
Interpretation Method ◽  
Nutritional Balance ◽  
Balance Index

The Diagnosis and Recommendation Integrated System (DRIS) allows the interpretation of results of leaf analysis through relationships among nutrients, instead of the absolute and isolated concentration of each one, as it is used by the criterion of sufficiency range. The objective was to evaluate three procedures of calculation of DRIS indices, and to verify the efficiency of DRIS as interpretation method for the results of Brachiaria decumbens (Signal grass). The study was developed with the results of six experiments carried out in a greenhouse at Piracicaba, SP, with nutrient solution. Concentrations of N, P, K, Ca, Mg, S, Cu, Fe, Mn, and Zn were used in the samples of recently expanded leaf laminae of the grass. The validation of the DRIS method used results from an experiment with nitrogen and sulfur rates applied to the same grass from the Mundo Novo farm, Brotas, SP. DRIS indices were calculated according to two criteria to choose the ratio order of nutrients (F value and R value) and three ways to calculate the nutrient functions (methods of Beaufils, Jones, and Elwali & Gascho). Nutritional Balance Index (NBI), calculated according to the generated norms, presented negative and significant correlation coefficients with the productivity in the combinations of methods tested and DRIS methods proposed by Beaufils, Jones and Elwali & Gascho were efficient in detecting concentrations that show nutrients deficiency or excess.

scholarly journals Two years of nitrogen and sulfur fertilizations in a signal grass pasture under degradation: changes in the root system

2011 ◽  
Vol 40 (6) ◽  
pp. 1195-1203 ◽  
Author(s):  
Cristiane Prezotto Silveira ◽  
Daniela Alves de Oliveira ◽  
Edna Maria Bonfim-Silva ◽  
Francisco Antonio Monteiro
Keyword(s):  
Root System ◽  
Rainy Season ◽  
Block Design ◽  
Nitrogen Concentration ◽  
Dry Mass ◽  
Brachiaria Decumbens ◽  
Randomized Block Design ◽  
Grass Root ◽  
Signal Grass ◽  
Nitrogen Rates

The objective of this research was to evaluate the effect of combinations of nitrogen and sulfur rates in degraded signal grass (Brachiaria decumbens) pasture on their productive, morphological and nutritional attributes in the root system at four soil depths. The pasture used in the experiment was established over eight years ago in Entisol. Five nitrogen rates (0; 150; 300; 450 and 600 kg/ha/year) and five sulfur rates (0; 15; 30; 45 and 60 kg/ha/year) were combined in a fractionated factorial in a randomized block design, with three replications. Nitrogen was supplied as ammonium nitrate and sulfur as gypsum, and the rates were split into three times in the rainy season. The evaluations occurred at intervals of 35 days during the rainy season and 56 days in the dry season, in two consecutive years. Roots were collected with a 4-cm diameter auger at 0-10; 10-20; 20-30 and 30-40 cm soil depths. It was determined root dry matter, length and surface of the root system and nitrogen and sulfur concentrations in roots. Nitrogen rates applied in two consecutive years in the pasture affected dry mass, length, surface and nitrogen concentration in signal grass root system. Rates of sulfur by themselves or combined with nitrogen rates do not affect attributes of root system.

Intake and digestibility of tropical grass hay fed to Santa Ines sheep in Brazil

1998 ◽  
Vol 1998 ◽  
pp. 93-93
Author(s):  
C. M. Korndörfer ◽  
I. C. S. Bueno ◽  
A. L. Abdalla ◽  
J. D. Sutton ◽  
E. Owen
Keyword(s):  
Positive Control ◽  
Brazilian Savanna ◽  
Tropical Pasture ◽  
Brachiaria Decumbens ◽  
Lack Of Information ◽  
Grass Hay ◽  
Signal Grass ◽  
Santa Inês ◽  
Tropical Grass

Ruminant feeding standards in Brazil are generally based on systems developed for temperate regions and there is a serious lack of information on grazed tropical pasture which is the main feedstuff. Signal grass (Brachiaria decumbens) represents half of the total cultivated pastures in Brazil (Miles et al., 1996). This study investigated the intake and digestibility by sheep of signal grass hay cut after re-growths of 28 and 56 days to represent the range used in practice in the Brazilian savanna. Lucerne hay was included as a positive control. The hays were offered at two levels of intake to Santa Ines wether sheep.

scholarly journals Filling the gap of Brachiaria decumbens (signal grass) research on clinico-pathology and haemato-biochemistry in small ruminants: A review

Toxicon ◽  
2020 ◽  
Vol 174 ◽  
pp. 26-31
Author(s):  
Kalai Vaani Muniandy ◽  
Eric Lim Teik Chung ◽  
Mimi Syazwani Jaapar ◽  
Muhammad Hazziq Mohd Hamdan ◽  
Annas Salleh ◽  
...  
Keyword(s):  
Small Ruminants ◽  
Brachiaria Decumbens ◽  
Signal Grass
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