In Europe, there is a considerable trend towards renewable energy sources. An example therefore is ethanol gained from corn such as maize and wheat. One chemical by-product which results from the extraction of starch is maize gluten fodder. Another chemical by-product resulting from the manufacturing of ethanol is slop. Slops and maize gluten fodder (MGF) are high-protein diets. Sustainable dried slops are also known as DDGS (distillers dried grains with solubles). In this paper, feeding tests have been carried out on dogs. Control fodder was compared to a product with DDGS and to a product with maize gluten fodder (MGF) as herbal protein components in fodder. The aim of this diet study on adult dogs was to examine the influence of three single diets on health status, body mass development, apparent digestibility of nutrients and minerals, the quality of feces and excremental microbiotica. These three diets have been tested for four weeks on three groups of three adult Beagle- dogs in a Latin square arrangement. The input of 20% DDGS and 20% maize gluten fodder have each been tested on three adult beagles in comparison to a standardized fodder over a period of 18 weeks. Every four weeks of this test phase, there has been a two-week adaptation period. At the beginning of these tests and after every feeding phase, the dogs´ body mass development and health status have been examined. These examinations comprised hematology tests, differential blood count and the testing of other chemical parameters in the blood. The physiological digestive parameters comprehended the determination of the apparent digestibility of nutrients, minerals and the consistency of the feces.
Furthermore, it also comprehended certain selectively cultivated groups of bacteria in the feces. All three types of single dry diets with up to 20% of developed maize/ maize gluten, DDGS or MKF diets respectively were very popular among the dogs. The body masses of the dogs remained approximately unchanging due to weekly diet adaptations. In clinical tests, the dogs showed no abnormalities and also their health status and the quality of the feces remained stable. Blood parameters like MCHC, urea, the proportion of lymphocytes in per cent and the eosinophile granulocytes slightly increased in all feeding phases. No alteration in other blood parameters became obvious. The controlled fodder showed a significant increase of apparent digestibility in the crude proteins, crude fat, N-free extracts and the energy compared to the DDGS and MGF group. The apparent digestibility of crude ash and crude fiber was significantly higher in the group with the DDGS diet. There were no differences in the apparent digestibility of crude proteins, crude fat, N-free extract, energy, P, Ca, Na and K between the maize gluten fodder diet and the DDGS diet. A decrease in the number of Clostridium perfringens in the DDGS became obvious.
Enterococcus faecalis, Enterococcus faecium, Escherichia coli, Clostridium difficile, Lactobacillus spp. and the overall germ count number have not been influenced. From the bacteriological examinations of the feces, it can be deduced that a dry dog food diet containing 20% of DDGS is viable in adult dogs' diet.