Navegando por Assunto "Plantas forrageiras"

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Acesso aberto (Open Access)
Características morfogênicas, estruturais, acúmulo de forragem e composição química de capim-massai, submetido à adubação nitrogenada
(Universidade Federal do Pará, 2016-01-29) CUNHA, Antonio Marcos Quadros; RÊGO, Aníbal Coutinho do; http://lattes.cnpq.br/4330113577933018
The objective of this study was to evaluate the morphogenic, structural, biomass accumulation and chemical composition of plants of Massai grass submitted to six nitrogen doses (0, 100, 200, 300, 400 and 600 kg of N / ha / year) in a completely randomized design, with six replications in plots of 12 m². Urea was used as the Nitrogen source, whose doses were divided in six applications during the rainy season, according to the treatments. Forage harvesting was done at a residue height of 15 cm, when the canopy intercepted 95% of the incident light at an average of five internal points on the plot with the Accupar model LP-80® canopy analyzer. Data were submitted to variance analysis and regression, the significance level was 0.05 of the linear and quadratic coefficient and the coefficient of determination. There was (p<0.05) an increase in the rates of appearance, length and leaf senescence, as we as the number of alive leaves, number of matura leaves, percentage of stems and number of grazing cycles, all of them adjusted to a linear model. In contrast, the phyllochron, the duration of the leaf's life, the leaf blade/stem ratio and the rest days decreased, also linearly adjusted. The results for the accumulation of forage per cycle, daily forage accumulation, total forage accumulation and accumulation of dry leaf mass corresponded in quadratic form (p<0.05), the increase of nitrogen fertilization means a direct effect of the nitrogen flow in the tissues. There was a positive and linear effect of the nitrogen fertilization (p<0.05) for the crude protein and organic matter content. Negative effect (p<0.05) adjuted to a linear model for the dry matter and mineral content. No effect was observed (<0.05) for neutral detergent fiber, acid detergent fiber and hemicellulose, which limit the digestion. The nitrogen fertilization favors morphogenesis, forage production and the qualitative characteristics of Massai grass.
Acesso aberto (Open Access)
Valor nutritivo da leguminosa Flemingia macrophylla (Willd.) Merrill para suplementação alimentar de ruminantes na Amazônia Oriental
(Universidade Federal do Pará, 2007) AVIZ, Márcia Alessandra Brito de; CAMARÃO, Ari Pinheiro; http://lattes.cnpq.br/1649891765946593; LOURENÇO JÚNIOR, José de Brito; http://lattes.cnpq.br/2919433679918544
The knowledge of the nutritional value of forage plants is of great relevance when it is intended to raise the productivity of the cattle systems in the Eastern Amazon, mainly in areas where deficiency of fodder plant of good quality occurs, in periods of water deficit. Thus, to characterize the potentiality of the leguminous Flemingia macrophylla (Willd.) Merril, as alternative for animal feeding, assumes excellent importance, therefore it can influence in the productive performance for meat and dairy cattle. This research aimed to evaluate the chemical composition, apparent digestibility and voluntary intake of this leguminous in the suplementary feeding of ruminants, in period of reduced availability of fodder plant and low nutritional value. The work was realized at the Embrapa Eastern Amazon, in Belem, Para State, Brazil (1º28'S 48º27'W). The nutrition characteristics of the leguminous were determined, during 21 days, with 16 sheeps, in individual metabolic cage, distributed in completely randomized, with four treatments and four repetitions. The experimental treatments (T1, T2, T3 and T4) contained Brachiaria humidicola and creasing levels of 100%, 75%, 50% and 25% of inclusion of F. macrophylla. The tannin level in the composition of the diet was 1.37; 0.62; 0.31 and 0.17%, respectively. The consumption of dry matter (g/day) and % of live weight were 901.8 and 2.4; 947.9 and 2.5; 859.5 and 2.2; e 930.2 and 2.5 and of crude protein 232.4; 188.7; 132.1 and 107.6 g/day. The coefficients of digestibilidade were 54.1; 59.2; 55.1; e 62.0%, in dry matter, and 57.3; 61.2; 57.6; e 64.0% in organic matter and the crude protein were 63.2; 60.5; 51.4; 52.0%, respectively. The leguminous has feeding potential, with high availability of dry matter, to be used as alternative for ruminants feeding supplementation, mainly in critical periods. Level of inclusion of F. macrophylla, around 75%, make possible greater consumption of the dry matter, organic matter and of fiber fractions and 100% allow better consumption of crude protein and gross energy.