Nitrite Content of Mixed Fodder Used in Laying Hens Feeding in Different Systems of Production (Conventional and Organic)
Abstract
Nitrite is formed naturally by the nitrogen cycle during the process of nitrogen fixation. Itis subsequently converted to nitrate, a major nutrient assimilated by plants. Animal feed can contain nitrite from its natural plant constituents (generally very low levels), from microbial action in moist feeds/stored plant materials (2). The nitrate present in the feed may be converted to nitrites by the microbial action that causes heating. Nitrites in a feed are ten times more toxic than nitrates (1).
The aim of this study was to identify and the comparative analysis of nitrite content (NO2¯) determined for samples of mixed fodder collected from two units from Romania with different systems in hens egg production (conventional and organic), activity which ensure the safety and the innocuity of mixed fodder.
Were taken 10 samples of mixed fodder from these two units. The working techniques (harvesting, training and preparation of laboratory samples) and the method for the determination of nitrite (using spectrofotocolorimetrie) were performed in compliance with the rules in force in Romania and standards harmonized with EU legislation (3).
Statistical analysis, revealed signiflcant differences (p≤0.001) between the mean values calculated for mixed fodder samples derived from conventional system compared with the ecological one for nitrite.
The results show that the nitrite values expressed in mg/kg (ppm) are below the maximum limits allowed by the legislation in force (4). Nitrite concentrations studied were different values, varying by area and type of farm.
- Barry, Yaremcio (1991). Nitrate Poisoning and Feeding. Nitrate Feeds to Livestock. Agri-Facts, Agdex 400/60-1.
- EFSA (2009). Nitrite as undesirable substance in animal feed— scientific opinion of the panel on contaminants in the food chain. European Food Safety Authority. EFSA J. 1017, 1-47.
- European Commission Regulation No 574, (2011), Maximum content in mg/kg (ppm) relative to a feed with a moisture content of 12 %.
- SR 13175:1993Â Fodder. Determination of nitrite and nitrate.
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