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| Registros recuperados: 29 | |
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| Carvalho, Vinícius Emanoel; Araújo, Saulo Alberto do Carmo; Alves, Danilo de Oliveira; Santos, Carlos César dos; Rocha, Norberto Silva. |
| This study aimed to evaluate the intake and milk yield of crossbred cows (Holstein x Zebu), under two management strategies, based on 95% light interception and fixed days. Eight lactating cows with body weight of 466 kg (± 35 kg) and lactation stage of 137 days (± 107 days) were used, four animals were assigned to each treatment. Dry matter intake was estimated indirectly, using neutral detergent insoluble fiber as internal indicator and chromium oxide as external indicator. This was a completely randomized design, with four replications, two grazing strategies and three days of occupation. The animals under light management showed dry matter intake on the first day (11.42 kg) similar to the second day (9.57 kg), and this was similar to the third day... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Produção Animal; Forragicultura animal production; Dairy cattle; Grazing strategies; Light interception; Milk production; Occupation period.. |
| Ano: 2019 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/46843 |
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| Santos, Manoel Eduardo Rozalino; Universidade Federal de Viçosa; Fonseca, Dilermando Miranda da; Universidade Federal de Viçosa; Gomes, Virgilio Mesquita; Universidade Federal de Viçosa; Pimentel, Roberson Machado; Universidade Federal de Lavras; Silva, Guilherme Portes; Universidade Federal de Viçosa; Albino, Ronan Lopes; Universidade Federal de Viçosa. |
| O objetivo foi avaliar as características estruturais da Brachiaria decumbens cv. Basilisk em relação à planta daninha Solanum sisymbrifolium no pasto. Os tratamentos foram dois locais no mesmo pasto, quais sejam, próximo e distante da planta daninha. O delineamento foi em blocos ao acaso com três repetições. O pasto foi manejado sob lotação contínua, com bovinos e com altura média de aproximadamente 25 cm. Foram quantificadas as densidades populacionais das categorias de tamanho dos perfilhos, a altura, a interceptação de luz, as massas e as densidades volumétricas dos componentes morfológicos do pasto. No local distante da planta daninha houve maior ocorrência de perfilhos com tamanho inferior a 20 cm. Já no local próximo da planta daninha, predominaram... |
| Tipo: Pesquisa Científica |
Palavras-chave: 5.04.04.00-8 densidade volumétrica de forragem; Interceptação de luz; Lotação contínua; Massa de forragem; Solanum sisymbrifolium forage bulk density; Light interception; Continuous stocking; Forage yield; Solanum sisymbrifolium. |
| Ano: 2011 |
URL: http://periodicos.uem.br/ojs/index.php/ActaSciAnimSci/article/view/10439 |
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| Kröning,A.B.; Costa,O.A.D.; Farias,P.P.; Martins,L.A.; Ott,O.G.; Macari,S.; Ferreira,O.G.L.. |
| ABSTRACT The objective of work was to study the productive profile of perennial peanut in a rotational stocking environment under different criteria. The treatments corresponded to pre-grazing height of 14 and 18cm or 95% of light interception (LI) distributed in a completely randomized design. The studied variables were forage mass, percentage of structural components, forage mass and the structural components in the lower and upper canopy strata. The entrance criterion of 18cm in height, despite having higher forage mass, presented lower percentage of leaves and higher percentage of stems and forage losses. The criteria of 14cm and 95% light interception presented similar production between them and the highest rate of forage accumulation. In all... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Forage mass; Light interception; Lower stratum; Upper stratum. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0102-09352019000300997 |
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| Barros,Ana Carolina Carvalho de; Almeida,João Carlos de Carvalho; Camargo Filho,Sergio Trabali; Carvalho,Carlos Augusto Brandão de; Campana,Ludmila Lacerda; Morais,Leonardo Fiusa de. |
| Abstract: The objective of this work was to evaluate the variations in root dry matter mass (RDM) and the percentage distribution (PD) of the root density of Florico grass (Cynodon nlemfuensis) in the 0-40-cm soil layer, when managed under different grazing strategies. Two defoliation frequencies (90 and 95% light interception, as the criterion for allowing animals in the paddock) and two defoliation severities (post-grazing heights of 20 or 30 cm) were assessed. Four seasonal evaluations of the root system were performed between the winter of 2012 and the autumn of 2013, using the monolith and trench excavation technique, collecting 1-dm3 samples from soil surface down to a depth of 40 cm, in four sequential extracts of 10 cm each. Lower RDM values (0.69... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cynodon nlemfuensis; Forage species; Light interception; Percentage distribution; Post-grazing stubble height; Root density. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001201276 |
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| Pedreira,Carlos Guilherme Silveira; Silva,Valdson José da; Guimarães,Murilo Saraiva; Pequeno,Diego Noleto Luz; Tonato,Felipe. |
| Abstract: The objective of this work was to evaluate the effects of variable and fixed rest periods on the forage production, plant-part composition, and canopy structural characteristics of 'Tifton 85' and 'Jiggs' Bermuda grass (Cynodon spp.) pastures under rotational stocking. The treatments were two grass cultivars (Jiggs and Tifton 85) and two rest periods (grazing starting whenever the canopy reached 25 cm or every 28 days, regardless of canopy height). A completely randomized experimental design, with a 2×2 factorial arrangement (two grass cultivars and two managements), was used with three replicates. The experiment was carried out during the summer growing season in Piracicaba, SP, Brazil. Pre- and post-grazing forage mass chacteristics were... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Cynodon; Canopy height; Grazing frequency; Light interception; Pasture management; Regrowth. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2018000100113 |
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| Pariz,Cristiano Magalhães; Costa,Ciniro; Crusciol,Carlos Alexandre Costa; Meirelles,Paulo Roberto de Lima; Castilhos,André Michel de; Andreotti,Marcelo; Costa,Nídia Raquel; Martello,Jorge Martinelli. |
| Abstract: The objective of this work was to evaluate the effect of intercropping systems between corn and tropical forages, at different cutting heights, on silage production, light interception, land use efficiency, intercropping competition factors, and pasture production. In the 2010/2011 and 2011/2012 crop seasons, two cultivation modalities were evaluated in the summer/autumn - monocropped corn with residual regrowth of signal grass (Urochloa decumbens) from the soil seed bank and corn intercropped with palisade grass (U. brizantha 'Marandu') -, in a factorial arrangement with two cutting heights for silage production - 0.20 and 0.45 m. After corn silage harvest, the forages were grazed by lambs in a semi-feedlot system, in the winter/spring.... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Urochloa; Zea mays; Cutting height; Land equivalent ratio; Light interception. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017000100054 |
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| Hernández,LF. |
| The relationships between (1) leaf biomass and morphology (lamina area and petiole and lamina inclination), (2) petiole's mechanical and structural properties, and (3) the vertical light gradient inside the crop's canopy were studied in field grown sunflower (Helianthus annuus L.) plants, maintained at optimum soil water and mineral levels. At flowering, incident photosynthetic active radiation (PAR) was measured at the top of the canopy and on individual leaves using a quantum sensor. The fraction of direct incident radiation which passed through the canopy reaching each individual leaf was then calculated. Individual petiole and lamina inclination angles (iaPetiole and iaLamina, respectively) were measured from sequential digital images. These were taken... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Biomechanics; Helianthus; Leaf angle; Light interception; Sunflower. |
| Ano: 2010 |
URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572010000200001 |
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| Barbosa,Rodrigo Amorim; Nascimento Júnior,Domicio do; Vilela,Hélio Henrique; Silva,Sila Carneiro da; Euclides,Valéria Pacheco Batista; Sbrissia,André Fischer; Sousa,Braulio Maia de Lana. |
| It was evaluated the morphogenic and structural characteristics of guinea grass under rotational at three grazing intervals and two defoliation intensities. Grazing intervals corresponded to the time needed by the forage canopy to reach 90, 95 or 100% of incident light interception during regrowth and they were evaluated combined to two defoliation severities (post-grazing conditions, 25 and 50 cm of height), being allocated to experimental units according to a complete randomized design, with three replicates and 3 × 2 factorial arrangement. The experiment was conducted from July 2003 to May 2004. For evaluation of morphogenetic and structural characteristics, ten tillers per experimental unit were selected. Morphogenetic and structural characteristics... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Canopy height; Grazing management; Light interception; Panicum maximum. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000500002 |
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| Sousa,Braulio Maia de Lana; Nascimento Júnior,Domicio do; Monteiro,Hélida Christhine de Freitas; Fonseca,Dilermando Miranda da. |
| This study was conducted to evaluate the daily production of forage and its morphological components, as well as the potential of forage utilization in pastures of Pennisetum purpureum cv. Napier managed with three post-grazing heights (30, 50 and 70 cm). Two experiments were carried out: one from February to May 2009 and another from December 2009 to May 2010, characterizing months of summer and fall. The experimental design was of completely randomized blocks with three replicates. The grazing was performed by crossbred heifers of approximately 270 kg body weight, when the sward intercepted 95% of the incoming light. In both experiments, the pastures managed with post-grazing height of 30 cm, in the summer months (December to March), presented lower... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Light interception; Pasture management; Pasture structure; Pennisetum purpureum. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000800006 |
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| Sousa,Braulio Maia de Lana; Nascimento Júnior,Domicio do; Monteiro,Hélida Christhine de Freitas; Silva,Sila Carneiro da; Vilela,Hélio Henrique; Silveira,Márcia Cristina Teixeira da; Rodrigues,Carlindo Santos; Sbrissia,André Fischer. |
| We assessed the accumulation dynamics of forage and its components in Elephant grass cv. Napier (Pennisetum purpureum Schum.) that were subjected to three post-grazing height treatments (30, 50, and 70 cm) from February through May 2009 (experiment one) and December 2009 through May 2010 (experiment two). In experiment one, the grazing events started when the light interception by the canopy reached 95%. The same was adopted for experiment two, except for the first grazing event, which was based on the height of the apical meristems of basal tillers. The experimental design for both experiments was a randomized complete block with three replications. The pastures that were managed at a post-grazing height of 30 cm exhibited lower rates of leaf and stem... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Grazing management; Growth; Light interception; Pennisetum purpureum; Senescence; Tiller categories. |
| Ano: 2013 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982013000900004 |
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| Montagner,Denise Baptaglin; Nascimento Júnior,Domicio do; Sousa,Braulio Maia de Lana; Vilela,Hélio Henrique; Silveira,Márcia Cristina Teixeira da; Euclides,Valéria Pacheco Batista; Silva,Sila Carneiro da; Carloto,Marciele Neves. |
| This study was conducted in order to evaluate the morphogenetic and structural characteristics of guinea grass cv. Mombasa under three post-grazing heights (intense - 30 cm, lenient - 50 cm and variable - 50 in spring-summer and 30 cm in autumn-winter) when sward light interception reached 95% during regrowth. Post-grazing heights were allocated to experimental units (0.25 ha) in a completely randomized block design with three replications. Post-grazing heights affected only leaf elongation rate and the number of live leaves. Pastures managed with variable post-grazing height showed higher leaf elongation rate in the summer of 2007. This management strategy also resulted in a higher number of live leaves. During the spring of 2006, plants showed lower leaf... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecophysiology; Grazing management; Light interception; Panicum maximum cv. Mombasa; Post-grazing height. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000400008 |
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| Braz,Thiago Gomes dos Santos; Fonseca,Dilermando Miranda da; Freitas,Fabrício Paiva de; Martuscello,Janaina Azevedo; Santos,Manoel Eduardo Rozalino; Santos,Márcia Vitória; Pereira,Vinícius Valim. |
| The objective of this work was to evaluate effects of nitrogen fertilization and plant density on morphogenesis of Tanzania guinea grass. It was used a random block design with 12 treatments and two replications in a 4 × 3 factorial arrangement, with four doses of nitrogen (N) (without N application, 80, 160 or 320 kg/ha.year) and three plant densities (9, 25 or 49 plants/m²). Harvest was performed at 25 cm from the ground when the canopy intercepted 95% of the incident light. Rates of leaf appearance and pseudostem elongation were positively and linearly influenced by nitrogen, whereas phillochron and leaf life span were influenced linearly and negatively. Leaf elongation responded positively to two factors, whereas leaf senescence rate and number of live... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Fertilization; Light interception; Morphogenetic characteristics; Structural characteristics; Panicum maximum. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011000700004 |
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| Montagner,Denise Baptaglin; Nascimento Júnior,Domicio do; Sousa,Braulio Maia de Lana; Vilela,Hélio Henrique; Euclides,Valéria Pacheco Batista; Silva,Sila Carneiro da; Sbrissia,André Fischer; Carloto,Marciele Neves. |
| The objective of this research was to evaluate the effects of tiller age on morphogenic and structural characteristics of guinea grass cv. Mombaca subjected to intermittent stocking and three stubble heights: 30 cm, 50 cm and 50-30 cm. Stubble heights were assigned to experimental units in a completely randomized block design with three replicates. Grazing was performed when canopy intercepted 95% of light incidence. Leaf appearance rate, leaf elongation rate and number of live leaves per tiller were higher in the summer when compared with the winter. Contrarily, stem elongation rate, phyllochron and leaf lifespan were lower in the summer when compared with the winter. During the summer, young tillers had higher leaf appearance and elongation rates when... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Ecophysiology; Light interception; Panicum maximum; Stubble height. |
| Ano: 2011 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982011001000006 |
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| Pereira,Vinícius Valim; Fonseca,Dilermando Miranda da; Martuscello,Janaina Azevedo; Cecon,Paulo Roberto; Santos,Márcia Vitória; Braz,Thiago Gomes dos Santos. |
| The objective of this study was to evaluate the effect of different levels of nitrogen supply and plants densities in the productivity of mombasa guineagrass (Panicum maximum) in the period of establishment. The design was of completely randomized blocks, with 12 treatments and three repetitions, with four nitrogen supplies (absence of application, 80, 160 and 320 kg/ha.year) and three plant densities (9, 25 and 49 plants/m²). The plot was cut at 30 cm from the ground when the sward high intercepted 95% of light. The following items were evaluated: sward height at 95% light interception, interval and number of cuts, dry mass production, total dry mass of leaves, stems and dead material and the morphologic composition. Nitrogen increased the dry mass... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Height; Light interception; Productivity. |
| Ano: 2012 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-35982012000500006 |
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| Registros recuperados: 29 | |
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