Evaluation of fruit-vegetable and fish wastes as alternative feedstuffs in pig diets

摘要

Fruit-vegetable and fish wastes were evaluated as potential feedstuff's for growing-finishing pigs. Wastes were collected from shops in the city of Salamanca (Spain) and their nutritional composition, mineral content and digestibility were determined. The dry matter of the wastes under study was relatively low (12 percent for fruit-vegetable waste and 26 percent for fish waste), but they presented all of the nutrient requirements for swine diets. The fish waste contained 58 percent crude protein, 22 percent ash, 19 percent ether extract and 1 percent crude fibre, whereas the fruit-vegetable waste contained 65 percent nitrogen free extract, 13 percent crude fibre, 12 percent crude protein, 8 percent ash and 2 percent ether extract. Waste digestibility decreased with temperature, and hence temperatures over 65 deg C for fruit-vegetable waste and 105 deg C for fish waste should not be used in the treatment to reduce the moisture and to ensure the microbiology quality. Therefore, two diets were formulated using linear programming. The analysed waste was included in approximately 20 percent of one of the diets, while another diet was formulated without any type of waste. These data showed that this part of biodegradable municipal waste could be managed as alternative feedstuffs in swine diets, reducing the amount of biodegradable municipal waste going to landfills.