Abstract
The purpose of this study was to determine the effect of the partial or total replacement of the inorganic Cu and Fe salts by organic forms of these elements on broiler performance and on the elimination of minerals through broiler droppings. A study was conducted for 42 days on 240 broiler chicks treated with trace elements chelates with amino acids: B-TRAXIMRTEC Cu-I30; BTRAXIMRTEC Fe-120. The broiler chicks were housed in cages (10 chicks per cage, 6 cages per group) and assigned to 4 groups (C, E1, E3 and E3) fed on the same corn-soybean meal-based diet. Phased-feeding was used according to the developmental stages of the broilers (starter, grower and finisher). Feed intake and the amount of droppings were recorded daily. The daily records of droppings and their chemical analysis was used to determine the trace elements load of the droppings. The total or partial replacement of the inorganic Cu and Fe salts by chelates of these minerals with amino acids in broiler diets didn?t affect broiler performance. The inclusion of Cu chelates in broiler diets at the level recommended by the manufacturer of by NRC decreased by at least 34% the level of Cu (environmentally toxic element) in the droppings. The corresponding decrease was of 5-21% for Fe.
Highlights
The diets used in the intensive system of poultry production are supplemented with minerals in order to avoid the deficiencies that might occur due to a variety of clinical and pathological problems (Underwood and Suttle, 1999)
Broiler parameters are the first stage in the evaluation of the dietary treatment effect (Jongbloed and Kemme, 2007)
The inclusion of Cu chelates with amino acids in the amount recommended by the manufacturer or at the level recommended by NRC (5 mg/kg) produced a decrease of up to 34% of the excreted Cu
Summary
The diets used in the intensive system of poultry production are supplemented with minerals in order to avoid the deficiencies that might occur due to a variety of clinical and pathological problems (Underwood and Suttle, 1999). The inorganic salts (oxides, sulphates) have been used in poultry diets due to their advantageous price and because they meet the requirements (Bao et al, 2007), but the organic sources with a higher bioavailability increased in importance (Creech et al, 2004; Revy et al, 2003). This means that less mineral supplements must be added to the diet (Jondreville et al, 2003), compared to the usual inorganic salts, without affecting poultry performance, which decreases the amount of excreted minerals. The efficiency of these products in which the mineral is bound to an organic compound, leaves place for debates, economic
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