Energia mecânica, energia térmica e moagem na extrusão de alimentos para cães e gatos

• Ano de defesa: 2015
• Autor(a) principal: Sá, Fabiano Cesar [UNESP]
• Tipo de documento: Tese
• Tipo de acesso: Acesso aberto
• Idioma: por
• Instituição de defesa: Universidade Estadual Paulista (Unesp)
• Palavras-chave em Português: Cão - Alimentação e rações; Gato - Alimentação e rações; Aminoacidos na nutrição animal; Digestão; Selenio na nutrição animal; Amino acids in nutrition
• Link de acesso: http://hdl.handle.net/11449/126533; http://www.athena.biblioteca.unesp.br/exlibris/bd/cathedra/12-08-2015/000835580.pdf

The efficiency of the extrusion process is directly related to the total energy transferred to the dough feed. Single screw extruders usually implement around 20kWh / ton of specific mechanical energy (SME), but less is known about the implementation of the specific thermal energy (STE) and the implications of the relationship between STE/SME processing of dog food and cats. This study evaluated the effects of the implementation of three relations between STE/SME on the macrostructure of estrusados, gelatinization, loss of nutrients, nutrient digestibility and palatability of food for dogs and cats. For each species, the experiment included a formulation processed in order to obtain three relations STE/SME totaling three diets for species. Nutrient digestibility was studied in 18 dogs or 18 cats, the total collection of feces. The palatability of the diets was compared for the two vessels method, at least 30 animals by comparison. The data were submitted to ANOVA and Tukey's test (P <0.05). Feed production was possible with different SME (8, 20 and 30 kWh / t) and relations STE/SME, but with total specific energy next. These had the same bulk density, gelatinization of starch and resistant starch. Provided to animals showed digestibility and similar energy production and resulted in similar characteristics of feces and does not alter the concentration of the fermentation product in the feces. There was, however, greater complexation fat as applied SME over the products (P <0.05). Dogs and cats had lower consumption of feed with 30 kWh / t, compared others (P <0.05). Dogs further preferred feed 20 over the 8 kWh / t (P <0.05), while for the latter cats had similar consumption. After extrusion was increasing content of some amino acids and an average reduction of 55% of its selenium content (P <0.05). It was concluded that different relations between SME and STE can be applied in the production of food for dogs and cats, with sufficient ...