ABSTRACT The objective of this study was to evaluate sequential digestible phosphorus levels for gilts from 30 to 100 kg. Sixty gilts were used, with an initial weight of 29.98±3.37 kg and final weight of 100.66±8.82 kg, distributed in a randomized block design, with five nutritional digestible phosphorus levels: 2.19-1.88-1.68, 2.69-2.38-2.18, 3.19-2.88-2.68, 3.69-3.38-3.18, and 4.19-3.88-3.68 g kg−1, respectively, for the growth phases 30 to 50 kg, 50 to 70 kg, and 70 to 100 kg, with six replicates and two […]

The objective of the present study was to evaluate soil collected from a laying-hen farm and bird manure according to the season of the year and sampling site. Soil samples were taken at the poultry facility wall and at the distances of 15 m and 45 m from the building. Bird feces samples were collected inside the poultry house at the entrance and at 1/4 and 1/2 length of the building. Soil and bird feces samples were evaluated by bacteriological […]

The objective of this research was to evaluate the performance of anaerobic co-digestion of swine excreta associated with increasing doses of crude glycerin and different hydraulic retention times (HRT). A completely randomized design was adopted in a 3 × 4 factorial arrangement composed of three HRT (10, 17, and 24 days) and four crude glycerin doses (0, 5, 10, and 15 g/100 g of total solids [TS]), with four replications per treatment. The assessed parameters were: biogas production potential, reductions […]

The work was carried out with the aim to verify the response of a cv. Tifton 85 pasture, in Depressão Central of Rio Grande do Sul state, to pig slurry (PS) fertilization, in the rates of 0, 15, 30 and 45 m3/ha/cutting, between October/03 and February/04, totalizing 0, 60, 120 e 180 m3/ha in the spring-summer. The PS was applied after cuttings, in: 15/10/2003 (uniformizing cutting), 11/24/2003, 1/10/2004 and 2/5/2004. The last cut was done in 4/10/2004 and then it […]

This work aimed to evaluate the effect of two swine deep beddings (SDB): rice husk (CA) and sawdust coarse (MA) on the production of natural pasture. The predominant species in this pasture were Axonopus sp. and Paspalum sp. that was sod-seeded with the forage legumes birdsfoot trefoil and white clover. The SDBs were applied in amounts equivalent to 180, 360, 540, and 720 kg/ha of P2O5. In order to achieve the target P application, different levels of CA (30, 60, […]

The work had the objective to verify the response of a natural pasture, in the “Depressão Central of Rio Grande do Sul”, Brazil, to pig slurry fertilization, in the doses of 0, 15, 30 and 45 m3/ha, equivalent to total application of 0, 76.5, 153.3, and 230.5 kg N/ha/cutting of N after each one of the four cuttings, between October/03 and February/04, totalizing 0, 60, 120, and 180 m3/ha of slurry. There was a linear increase of dry matter (DM) […]