This study was conducted to determine the real outflow of liquid effluents to be considered in balance calculations at the farm and regional levels in Vietnamese conditions. The variability of the chemical composition of a local dataset was analysed considering the highly heterogeneous wastes and byproducts used on crops. Near infrared spectroscopy (NIRS) was introduced to evaluate the feasibility of a rapid technique applied to animal wastes. Characterization of effluent outflows and water use and composition variation of solid co-products (compost and fish food) was carried out. Quantity of animal solid waste per pig head in the cold seasons was higher than in the hot season. Data collected from ten farms in Thai Binh (Vietnam), showed that the content of the main constituents in the fresh weight (FW) in the warm season was 17.3% OM total. Nitrogen, P2O5 and K2O totals were 160, 3.51 and 0.59%, respectively. Raising pigs in the cold season discharged 0.352kg N, 0.229 kg P2O5 and 0.148 kg K2O per metric ton live weight and he liquid part contributed 5.5, 2.1 and 12.8%, respectively. A total of 66 samples of compost and animal waste as fish feed were taken during summer, of which 46 were ready-to-spread compost, 20 others were animal excreta as fish feed. These results confirmed the fact that it is possible to use the animal waste source coming from the pig farms of Thai Binh province as a main nutrient for crops, especially for rice. After preliminary calibrations using NIRS spectrometry with local pig waste and co-products, perspectives are promising in terms of research and local development. A description of the design of the Chinese digester, more commonly called biogas digester and of the NIRS technique is provided.