Suplementacao de zinco orgânico na racão de frangos de corte alojados em cama nova ou reutilizada

Abstract: Several factors can affect the development of the broiler, among them we can highlight nutrition and management. In the context nutritional, mineral supplementation is a necessary practice because, in general, the diets did not contain these elements in sufficient quantity to meet the needs of poultry. Zinc is a trace mineral essential to life, participating in several important functions in the body. Generally zinc is added to diets of birds in inorganic forms (oxides, carbonates or sufatos), however in its organic form or chelated presents more bioavailable. The objective of this study was to evaluate the effect of levels of organic zinc (ZnO) in the diet of broilers from 1 to 42 days, housed in new or reused litter. The experiment was conducted in the poultry sector of the Special Unit for Agricultural Sciences EAJ / UFRN. 576 chicks were used 1 day of commercial strain Cobb, distributed in a completely randomized in a 4x2 factorial arrangement with four levels of ZnO 0, 40, 80 and 120 ppm and two environments, new bed (COn) and reused litter (CRE) resulting in eight treatments with six replications of 12 birds. In the pre-initial responses were linearly increasing levels of ZnO on feed intake and quadratic effect on body weight and weight gain. The levels of 72.41 and 70.05 ppm of ZnO in the diet of chicks improved body weight and weight gain, respectively. There was interaction between ZnO and the type of bedding used. The ZnO did not affect broiler performance in the growing phase. There was an interaction between levels of ZnO and type of bed used. The levels of 61.50 and 85.30 ppm organic zinc improves immunity and increases the deposition of zinc in tibia of broilers at 42 days, respectively. ZnO also increases the resistance of the skin of broilers at 42 days of age. Using Cre improves performance of broilers from 1 to 42 days old

Água residuária da mandioca como fertilizante orgânico em pasto de Brachiaria brizantha cv. Marandu

Brazil is the world's second largest producer of cassava, which most of the production is used to make flour and starch, generating large amounts of waste, cassava. In general, this waste is disposed of directly into the soil and waterways, causing serious environmental impacts. In view of this, the aim of this work was to evaluate the use of cassava wastewater water (cassava) as organic fertilizer in Brachiaria brizantha pasture. Marandu. The experiment was conducted at the Campus Macaíba the Federal University of Rio Grande do Norte. The treatments were increasing rates of cassava, applied to the soil as organic fertilizer. The experimental design was a randomized block design with six treatments and four replications. The treatments consist of cassava doses (0, 15, 30, 60 and 120 m³ ha- 1 ) and a treatment with mineral fertilizer (AM) in the form of NPK (140: 30: 120 kg ha-1 ). Three cuts with an interval of 60 days were carried out. The variables evaluated were: plant height; accumulation of morphological components of fodder; Trapping Light (IL); Leaf Area Index (LAI); Total chlorophyll (CT); Feature Production Seca (PMS). The dry matter production at a dose of 120 m³ha-1 had a quantitative increase, with a total production in 2796 kg ha-1 DM in the second cut, providing an increase of 493% compared to control, and the residual effect observed in the third cut caused a 100% increase compared to 0 m³ ha-1 . Comparing the PMS obtained with the use of AM and other treatments it was observed that it was the second cut equivalent to a dose of 120 m³ ha-1 and the third equivalence has been cut at doses 60 and 120 m³ha-1. For the variables plant height, IL, IAF, CT and leaves Mass adding cassava in the soil promoted a positive linear increase for the three cuts. However, with the AM the IAF was superior to the other treatments. The thatched mass reached its highest production (838 kg ha-1 DM) in the second cut when using a dose of 120 m³ha-1 . In dead material mass in the second and third sections, there was increased linearly increased total of 322 and 452% respectively, compared to a dose of 0 m³ha-1 . The use of cassava showed herbicidal effect for the variable mass of the undesirable negative linear response resulting in decreasing the amount of residue with increasing doses. Manipueira can be used as organic fertilizer in Brachiaria brizantha cv. Marandu for improvements in the productive characteristics, as promoted significant increases in 8 most of the variables studied, especially at a dose of 120 m³ha-1 . This benefits the environment by being alternative for disposal of cassava.