Abstract
Abstract. Contemporarily, the production of high-grade ethyl alcohol enables obtaining dried distillers decoction that contains post-fermentation residues of cereal grains, solubles as well as yeast cells and their metabolites multiplied in the fermentation process, which makes that product applicable also in poultry feeding. Experiments were conducted on 540 broiler chickens of COBB 500 line. One-day chicks were randomly allocated to 3 nutritional groups: K, D1 and D2, each group consisted of 6 replicates of 30 birds. The factor that differentiated the groups was the content of dried wheat decoction in the starter type feed mixture (5% and 7%). Production results (individual body weight, feed intake and mortality) of the birds were controlled in a 42-day rearing period. On the 42nd day of rearing, 6 male and 6 female chickens from each group were chosen for slaughter that had body weights similar to the average of each group according to gender. The aim of this study was to determine experimentally whether the by-product of ethanol production is suitable for replacing soybean meal in feeding broiler chickens. The application of the wheat decoction had no negative effect on production results of the chickens. The birds fed a mixture with a higher content of dried distillers grains with solubles (DDGS) were characterised by a similar body weight and better feed conversion ratio compared to the control birds. A properly-balanced (fibre, energy, amino acids) nutritional dose of the dried wheat decoction may be used as a good energy-protein component in feed mixtures for broilers. It is a rational means of DDGS management which is, simultaneously, a cheaper substitute for soybean meal.
Highlights
Dried distillers grains with solubles (DDGS) are a by-product of the spirit industry and of bioethanol production
Body weight of the males, fed the diet with the addition of DDGS was lower in comparison to that of the males from the control group (K), In turn, the body weight of the females was equal in all feeding groups on the 35th as well as on the 42nd day of life (Table 2)
Mortality in the particular feeding groups amounted to 3.0-5.5 % and the lowest mortality rate was found in the chickens from D1 group (3.0 %)
Summary
Dried distillers grains with solubles (DDGS) are a by-product of the spirit industry and of bioethanol production They are obtained as a result of multi-stage concentration, and long-lasting drying of cereal mash, earlier deprived of ethyl alcohol. These products are constituted by components from initial raw material, being insensitive to fermentation (non-starch carbohydrates, protein, fat, ash and others), and biomass of the multiplied yeasts. Arch Tierz 55 (2012) 5, 496-505 discussed products is considerably greater than in other vegetal feeds (Martinez Amezcua et al 2004, Lumpkins & Batal 2005) It is especially important in feeding broiler chickens which due to a high growth are characterised by high demand for this element. It is important from the ecological viewpoint, because the DDGS-containing mixtures enable a lower intake of dietary phosphates, owing to which the release of phosphorus to the environment is minimised (Koreleski & Świątkiewicz 2006)
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