Ileal and total tract nutrient digestibilities and fecal characteristics of dogs as affected by soybean protein inclusion in dry, extruded diets.

Abstract

Plant-based protein sources are generally less variable in chemical composition than animal-based protein sources. However, relatively few data are available on the nutrient digestibilities of plant-based protein sources by companion animals. The effects of including selected soybean protein sources in dog diets on nutrient digestion at the ileum and in the total tract, as well as on fecal characteristics, were evaluated. Six protein sources were used: soybean meal (SBM), Soyafluff 200W (soy flour), Profine F (traditional aqueous-alcohol extracted soy protein concentrate [SPC 1]), Profine E (extruded SPC [SPC 2]), Soyarich I (modified molecular weight SPC [SPC 3]), and poultry meal (PM). All diets were extruded and kibbled. Test ingredients varied in CP and fat contents; however, diets were formulated to be isonitrogenous and isocaloric. Nutrient intakes were similar, except for total dietary fiber (TDF), which was lower (P < 0.01) for dogs fed the PM diet. Apparent ileal digestibilities of DM, OM, fat, and TDF were not different among treatments; however, CP digestibility at the terminal ileum was higher (P < 0.01) for diets containing soy protein sources than for PM. Total tract CP digestibility was greater (P < 0.01) for soy protein-containing diets than for PM. Apparent total tract digestibilities of DM, OM, fat, and TDF were not different among treatments. Apparent amino acid digestibilities at the terminal ileum, excluding methionine, threonine, alanine, and glycine, were higher (P < 0.01) for soy protein-containing diets than for PM. Dogs fed SPC diets had lower (P < 0.01) fecal outputs (g asis feces/g DMI) than dogs fed the SF diet, and dogs fed SBM tended (P < 0.11) to have lower fecal outputs than dogs fed the SF diet. However, dogs fed the PM diet had lower (P < 0.03) fecal outputs than dogs fed SPC-containing diets. Fecal outputs and scores reflected the TDF and nonstructural carbohydrate contents of the soy protein fraction. Soy protein sources are well utilized by the dog prior to the terminal ileum, and SPC offers a viable alternative to PM as a protein source in dry, extruded canine diets.

Protein and amino acid bioavailability estimates for canine foods

“…Bednar et al (2000) used various ingredients that contained protein including wheat, corn, wheat gluten meal, beef and bone meal, poultry byproduct meal, or poultry meal. Diets used by Clapper et al (2001) contained chicken bone residue next to a protein source and Gajda et al (2005) used various protein sources. Although 5 other studies were found to report apparent ileal CP and AA digestibility values in adult dogs, their data were not used in the present study.…”

“…The data set contained information on BW, food intake, dietary N content, and apparent fecal and apparent ileal digestibility of N. From 24 diets reported in 6 studies (Bednar et al, 2000;Clapper et al, 2001;Gajda et al, 2005;Tjernsbekk et al, 2014), apparent ileal digestibility values of individual AA were also collected. Studies where diets were used composed of only 1 protein source (e.g., soybean meal, meat meal) were excluded as these were considered to be not representative for commercial diet compositions.…”

Avaliação de dietas com diferentes fontes protéicas para cães adultos

“…O subprocessamento da soja mantém estes fatores ativos, prejudicando a obtenção de bons resultados com o alimento (Butulo, 2000). Desta forma, o baixo CDA da PB do farelo de soja encontrado por Yanka et al (2003), entre 64,3 e 68,6%, em comparação ao deste e de outros estudos (Clapper et al, 2001;Murray et al, 1997;Zuo et al, 1996), pode ser decorrente do uso de um ingrediente mal processado. Segundo Yanka et al (2003), a baixa digestibilidade registrada em seu experimento pode ser resultado do alto teor de estaquiose no farelo de soja utilizado (112 g de estaquiose por quilograma de farelo de soja).…”

Metodologias para determinação da digestibilidade de dietas contendo fontes proteicas vegetal ou animal em cães

“…Embora os ingredientes proteicos de origem vegetal possuam menor variação em seu valor nutricional, quando comparado aos de origem animal, ainda são escassos estudos disponíveis com relação à digestibilidade destes para animais de companhia (CLAPPER et al, 2001). Por outro lado, a composição nutricional e a biodisponibilidade dos nutrientes das farinhas de origem animal são inconsistentes, pois são infl uenciadas, entre outros fatores, pelo nível de inclusão dos diferentes tecidos animais e pela temperatura e tempo de processamento da farinha (FAHEY & HUSSEIN, 1998).…”