Distribuição de colmo na estrutura vertical de pastos de capim Aruana e azevém anual submetidos a pastejo intermitente por ovinos

Zanini, Guilherme Doneda; Santos, Gabriela Trevisan; Schmitt, Daniel; Padilha, Deisy Andrade; Sbrissia, André Fischer

doi:10.1590/s0103-84782012000500020

Cited by 31 publications

(33 citation statements)

References 12 publications

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“…Increased pasture use efficiency is one of the goals of rational grazing management strategies (Da Silva, 2013). These values are below those found in the literature (Zanini et al, 2012;Rodolfo et al, 2015) in which percentages of 50-70% are considered, but these studies have considered a reduction in the canopy height, and in this study, the calculation was based on the green forage mass.…”

Section: Anjos a J Dos Et Alcontrasting

confidence: 69%

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

et al. 2016

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An evaluation of productive potential is not the only factor used to determine grazing management efficiency; it is also necessary to know the structural characteristics of the canopy. The objective of this study was to evaluate the effects of two management styles on Marandu palisade grass pastures under rotational stocking with respect to the herbage mass, morphological composition, and structural characteristics of the pasture. The treatments under consideration were a) a fixed rest period of 30 days (RP30) or b) a rest period based on the time necessary for the canopy to reach 95% light interception (LI95). The experimental design was a completely randomized block with two blocks and three replicates within the blocks. Animals were placed in the paddocks when the grass reached the established management criteria, which were maintained for three days to reach 25 cm in stubble height. Shorter grazing intervals (22.8 vs. 30 days), lower pre-grazing heights (35.9 vs. 42.3 cm), and lower forage masses (4,411 vs. 5,290 kg/ha.cycle) were observed in LI95 pastures. The LI95 treatment had a higher leaf percentage (48.3 vs. 41.1) and the lowest percentage of dead forage (19.0 vs. 25.4) in the pre-grazing forage mass of the pasture in relation to that of RP30. Performing pasture management based on RP30 throughout the season is harmful to the pasture structure because it reduces the leaf percentage and increases the stem and senescent material in the available forage. The lower pre-grazing forage mass observed under LI95 management is offset by more grazing cycles within the rainy season.Index terms: Pre-grazing height; Grazing cycle; interception of photosynthetically active radiation; leaf mass. RESUMOA avaliação do potencial produtivo do pasto não é o único fator que pode ser usado para determinar a eficiência de manejo do pastejo, também é necessário considerar as características estruturais do dossel. Neste estudo, objetivou-se avaliar a influência de dois critérios para definição do período de descanso do pasto de capim-marandu sobre a massa de forragem, a composição morfológica e as características estruturais do pasto durante a estação chuvosa. Os períodos de descanso estudados foram: fixo de 30 dias (PD30) e variável, conforme a interceptação de 95% da radiação fotossinteticamente ativa (IL95). O delineamento experimental utilizado foi em blocos inteiramente casualizados, com duas repetições de área e três repetições dentro de bloco. Os animais (vacas mestiças) foram colocados nos piquetes, logo que os pastos atingiam os critérios de manejo estabelecidos e permaneciam dentro dos mesmos durante três dias, de forma a atingir a altura de resíduo de 20-25 cm. Menor intervalo entre pastejo (22,8 vs. 30 dias), menor altura pré-pastejo (35,9 vs. 42,3 cm) e menor massa de forragem verde (4.411 vs. 5.290 kg/ha.ciclo) foram observados no pasto sob IL95. Contudo, o pasto sob IL95 apresentou maior percentual de lâmina foliar (48,3 vs. 41,1) e menor percentual de material morto (19,0 vs. 25,4) na massa de forragem ...

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Section: Anjos a J Dos Et Alcontrasting

confidence: 69%

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

et al. 2016

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“…The same response was not observed for most of the severe grazing (10 cm), in which the increase in post-grazing height from summer to fall was observed (Table 2). These results are in agreement with the data presented by Zanini et al (2012), which showed that around 90% of the whole stem in forages subjected to rotational stocking is at heights lower than 50% of the pre grazing height, making the process of seizing and ingesting forage more difficult. Lemaire & Chapman (1996) observed that LAR is considered the main feature of morphogenesis because of its influence on the three main components of the sward structure: final leaf length (FLL), tiller population density (TPD) and number of live leaves per tiller (NGL), determining the leaf area index (LAI) of the pasture.…”

Section: Sward Light Interception (%)supporting

confidence: 93%

Frequencies and intensities of defoliation in Aruana guineagrass swards: morphogenetic and structural characteristics

2012

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-The objective of this study was to evaluate the morphogenetic and structural characteristics of Aruana influenced by the frequency and intensity of grazing adopted, as well as by the seasons, implying that the capacity and speed for the recovery of Aruana grass pastures after grazing depend mainly on the management and edaphoclimatic conditions. The best grazing management for Aruana guineagrass is 95% canopy light interception, i.e., 30 cm pre-grazing height pastures interrupted when reaching 15 cm residue.

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“…In the 'Napier' cultivar, CARVALHO et al (2007) Some studies have shown that the ideal time to interrupt grazing must not exceed 50% of the initial height because beyond this point, there is a reduction in the instantaneous herbage intake rate (FONSECA et al, 2012) with a possible negative impact on herbage intake and animal performance. Studies with aruana guinea grass and annual ryegrass conducted by ZANINI et al (2012) indicated that approximately 90% of the stem mass is concentrated in the first half of the sward, suggesting that the presence of this component could act as a physical barrier to grazing animals.…”

Section: Introductionmentioning

confidence: 99%

Levels of defoliation and regrowth dynamics in elephant grass swards

et al. 2015

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Distribuição de colmo na estrutura vertical de pastos de capim Aruana e azevém anual submetidos a pastejo intermitente por ovinos

Abstract: RESUMO O objetivo deste estudo foi determinar a participação relativa de colmo na estrutura vertical de pastos de capim Aruana e azevém anual submetidos a estratégias de pastejo intermitente por ovinos. Os tratamentos para o capim

Cited by 31 publications

References 12 publications

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

Forage mass and morphological composition of Marandu palisade grass pasture under rest periods

Frequencies and intensities of defoliation in Aruana guineagrass swards: morphogenetic and structural characteristics

Levels of defoliation and regrowth dynamics in elephant grass swards

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