Referência:
Kawauchi, I.M. ; Sakomura, N.K. ; Vasconcellos, R.S. ; de-Oliveira, L.D. ; Gomes, M.O.S. ; Loureiro, B.A. ; Carciofi, A.C. (2011) . Digestibility and metabolizable energy of maize gluten feed for dogs as measured by two different techniques. Animal Feed Science and Technology. v. 169X. p. 96-103. doi:10.1016/j.anifeedsci.2011.05.005
Resumo:
Maize gluten feed (MGF) is a co-product of wet milling of maize, and is composed of struc-tures that remain after most starch, gluten and germ has been extracted from the grain.Although currently used in dog foods, its digestibility and energy values have not beendocumented. Two techniques were used to determine nutrient digestibility of MGF fordog foods. Both techniques used extruded diets fed to Beagle dogs, with six replicates perdiet. The ?rst study used a difference method in which 300 g/kg of a reference diet wasreplaced by MGF. Based on the difference method, the coef?cient of total tract appar-ent digestibility (CTTAD) of MGF was 0.53 for dry matter (DM), 0.69 for crude protein(CP), 0.74 for fat, 0.99 for starch, and 0.55 for gross energy (GE). The calculated metabo-lizable energy (ME) of MGF was 7.99 MJ/kg (as-fed). The second study used a regressionmethod and included a basal diet and a basal diet with 70, 140 and 210 g MGF/kg of diet(as a substitute for maize starch). Maize gluten feed inclusion resulted in a linear reduc-tion of CTTAD of DM (R2= 0.99; P<0.001), CP (R2= 0.95; P=0.002), fat (R2= 0.87; P=0.009),starch (R2= 0.81; P<0.001), and GE (R2= 0.99; P<0.001). Faecal production increased lin-early from 56 g to 107 g/dog/d (R2= 0.99; P<0.001), with a linear reduction of faecal DM(R2= 0.99; P<0.001) and a linear increase in faecal lactic acid concentration (P<0.02). Bothurine (R2= 0.77; P=0.029) and faeces (R2= 0.92; P=0.019) showed a linear reduction in pH.Results of ingredient CTTAD obtained by the regression and difference methods were close(6% or less of variation) for CP, fat, and starch, and also for ME content (1.4% higher for thedifference method), but the two methods disagreed on calculated CTTAD of DM and organicmatter. The high dietary ?ber content of MGF (382 g/kg) may explain the low digestibilityof this ingredient. Maize gluten feed could be a useful ingredient for formulations designedto have low energy or reduce the urine pH of dog.