国内外4种微颗粒饲料的水中稳定性及其对部分水质指标的影响

Four kinds of foreign and domestic micro-diets' stability in water and their effects on water quality

在相同的试验条件下,对比国内外4种商品微颗粒饲料的物理性状、浸泡过程中营养物质的溶失、浸泡液中有机氮及有机磷含量的差异,探讨了目前国内外微颗粒饲料的水中稳定性及其对部分水质指标的影响。结果表明,除微颗粒饲料D4的沉降速度较快外,其他3种相当;前5min溶失的物质是各种微颗粒饲料总失重量的大部分;国内外微颗粒饲料中的重要营养成分如:粗蛋白和粗脂肪含量有较大差异;浸泡30min时,各种微颗粒饲料中粗蛋白和粗脂肪含量前后波动幅度小;浸泡30min时,微颗粒饲料D1浸泡液中溶解有机磷含量是最低的,而溶解有机氮含量是最高的。可以看出,目前国内外商品微颗粒饲料的水中稳定性差异较大,这与各种微颗粒饲料的营养配方及加工工艺密切相关。

Four kinds of foreign and domestic micro-diets were tested for stability in water and their effects on some parameters of water quality under the same experimental conditions. It was found that, three micro-diets soaked in water settled slowly, while D4 settled more quickly. Most of the total weight loss of the four micro-diets were lost during the first 5min after they were put into water. The contents of protein and fat in the four micro-diets varied significantly and fluctuated insignificantly between in 0min and in 30min after being soaked in water. After 30min, the soaking water from D1 contained the highest concentration of dissolved organic nitrogen （DON） and the lowest concentration of dissolved organic phosphorus （DOP） among four micro-diets. It was demonstrated that the four kinds of foreign and domestic micro-diets varied significantly in terms of stability in water, which had close relationship with their nutritional formula and processing techniques.