Helmut Meyer's research while affiliated with University of Veterinary Medicine Hannover and other places

... A homemade plant-based diet was designed using web-based formulation software 1 (Tables 3, 4) to meet the AAFCO nutrient profile for adult maintenance with low concentrations of struvite precursors, and utilized ingredients intended to promote urine acidity (12). Acidification of the urine was predicted by calculation of the base excess of the diet (13) (13). Plant-based fatty acid supplementation was recommended, with plant-based arachidonic acid and EPA+DHA. ...

... Copper is a component of enzymes that catalyze oxidation reactions and is involved in connective tissue formation, Fe metabolism and hematopoiesis, hair pigmentation, myelin formation and defense mechanisms against oxidative damage [80]. Symptoms of Cu deficiency include loss of hair pigmentation and hyperextensions of the distal phalanges [81]. Selenium and zinc are trace elements with important biological functions (e.g., immune response) [82,83]. ...

... Common dietary strategies, in order to reduce energy density in pet diets, include increasing the volume of food by producing bigger, aerated kibbles (Serisier et al., 2014), increasing water content (Alexander et al., 2014), or to increase the inclusion of dietary fibre from non-digestible carbohydratebased plant materials (De Godoy et al., 2013;German et al., 2010b;Hours et al., 2016). Although dietary fibre is not a required nutrient in feline nutrition, the inclusion of optimal amounts of indigestible material in the diet allows a proper intestinal peristalsis and gut physiology (Kienzle et al., 1991). In fact, the natural diet of cats consists of whole preys that include indigestible glycoprotein rich materials, such as bones, tendons, cartilages, skins, hair and feathers (Verbrugghe and Hesta, 2017). ...

... kcal per 100 g DM. It has been shown that some breeds such as newfoundland dogs and huskies have relatively lower energy requirements, while Great Danes have energy requirements above the average [Burger and Johnson 1991, Kienzle and Rainbird 1991, Meyer and Zentek 1991. Breed-specific needs probably reflect differences in temperament, resulting in higher or lower activity, as well as variation in stature or insulation capacity of skin and hair coat, which influences the degree of heat loss. ...

... The PME density of the regurgitate fed to the scarlet macaw chicks was equivalent to a starter poultry feed (62), and higher than the low quality food used by the kakapo to feed their chicks (41). The daily energy requirements of growing birds change as a function of weight gain rate and body composition (26,138).As anticipated, the PME density of the diet fed to the scarlet macaw chicks did not change with age(139). there is also a difference on an energy density basis. ...

... Another method for establishing nutrient requirements is the factorial calculation (e.g. [21,[28][29][30]). Endogenous losses via skin, urine and faeces have to be quantified and summed up [31]. ...