Tatiana Neres de Oliveira

Influência do fósforo e de diferentes regimes de corte na produtividade e no perfilhamento do capim-de-raiz (Chloris orthonoton Doell)

The work was carried out in a greenhouse, at the Animal Science Department/UFRPE, from October 2000 to May 2001, to evaluate the effect of phosphorus fertilization and different cut systems on the productivity and tillering of the capim-de-raiz (Chloris orthonoton, Doell). The experimental design was completely randomized, distributed in a factorial arrangement 3 x 2 x 2, being three levels of application of phosphorus fertilizer (0, 100 and 200 kg/ha of P2O5), two cut frequencies (30 and 40 days) and two cut intensities (5 and 15 cm). Significant interaction between cut frequency and cut intensity as well as phosphorus fertilization and cut frequency for the DM yield was observed. The best combination between cut frequency and cut intensity was 40 days and 5 cm, respectively, with 10.66 g/pot of DM. The phosphorus fertilization showed higher efficacy when the cut frequency was 40 days (11.70 g/pot of DM). Phosphorus fertilization, cut frequency and cut intensity showed significant effect on the tillering process.

Avaliação do consumo de silagens de sorgo tratadas com amônia anidra e, ou, sulfeto de sódio na alimentação de novilhas ¾ Indubrazil/Holandês

Eight ¾ Indubrazil/Holstein heifers, averaging 160 kg, were assigned to 4 x 4 latin squares, during four periods of 21 days, 15 days of adaptation and six days of samples collection. The animals were fed a diet with 60:40 roughage:concentrate (DM basis), using as roughage sorghum silage, ensiled with DM content of 30%, and as concentrate, corn and soybean meal, with 15.6% crude protein. The treatments were: T1 - control (silage without additive), T2 - silage treated with 2.5% sodium sulfide, T3 - silage treated with 2.5% anhydrous ammonia and T4 - silage treated with 2.5% sodium sulfide + 2.5% anhydrous ammonia, all in dry matter basis, using storage time of six months for all treatments. Dry matter (DM), crude protein (CP), neutral detergent fiber (NDF) and acid detergent fiber (ADF) daily intakes, in percentage of live weight and metabolic weight, were studied. It was verified effect for all studied variables, where the higher intake values were observed for the sorghum silage treated with ammonia, while sodium sulfide did not show any effect. These values show the anhydrous ammonia efficiency on the action of cell wall constituents, resulting in higher intake.

Avaliação de métodos para recuperação de pastagens de braquiária no agreste de Pernambuco: 2. valor nutritivo da forragem

The research was carried out to evaluate qualitative aspects of a B. humidicola degraded pasture managed under different recovery methods in Bezerros-PE. A confounded split-plot randomized block design was used. The main plot was formed by the factorial arrangement between managements and fertilization levels. The splitplot model consisted of the different deferment periods. The factors were represented by four recovery managements (no-tillage, arrowing, arrowing + corn, no-tillage + corn), two N levels (0 and 100 kg/ha of N), two P levels (0 and 100 kg/ha of P2O5) and four deferment periods (113, 156, 200 and 240 days), with three replications. CP, NDF, ADF, P, ashes contents and IVDMD were determined. Significant interaction among management systems and P fertilization was observed when NDF, ADF and P concentration of braquiaria were evaluated. B. humidicola deffered for 113, 156, 200 and 240 days showed the following ADF and IVDMD values, respectively: 40.36 and 61.92%; 43.89 and 56.58%; 44.52 and 31.35%; 46.25 and 30.07%.