Raw and rendered animal by-products as ingredients in dog diets.
Approximately 25 to 40% of the DM in premium dog diets is animal by-product. However, limited information is available regarding the composition and digestibility of these by-products, especially small intestinal digestibility. The effects of raw and rendered animal by-products incorporated into dog diets on nutrient digestion at the ileum and in the total tract were studied in this experiment. Diets fed contained various animal by-products including a rendered beef meat and bone meal (RMBM); fresh beef (FB); poultry by-product meal (PBPM); fresh poultry (FP); a plant-based control protein source, defatted soy flour (DS); and an animal-based control protein source, dehydrated whole egg (WE). The diets were extruded and kibbled. By-products varied widely in concentrations of OM, CP, amino acids, and fat. Nutrient intakes were numerically higher for FB than for all other treatments. All nutrient intakes were higher (P < .03) for the FB treatment than for the RMBM treatment. Digestibilities of DM, OM, CP, fat, and GE at the ileum were higher (P < .06) when dogs were fed diets containing FP than when fed diets containing PBPM. Amino acids were highly digestible at the ileum; however, digestibilities of all amino acids except cystine were higher (P < .04) for the diets incorporating FP vs PBPM. Total tract digestion was different among treatments for DM (P < .02), OM (P < .01), and GE (P < .02), and diets containing animal by-products were similar in total tract digestibility, greater than the DS control, and lower than the WE control. Rendering of poultry, but not beef, seemed to have a slight negative influence on small intestinal, but not total tract, digestibility by dogs.
Murray
S M
SM
Department of Animal Sciences, University of Illinois, Urbana 61801, USA.
Patil
A R
AR
Fahey
G C
GC
Merchen
N R
NR
Hughes
D M
DM
D000596:Amino Acids / Q000378:metabolism; D000821:Animal Feed / Q000592:standards*; D000824:Animal Nutritional Physiological Phenomena; D000818:Animals; D001688:Biological Products; D002404:Catheterization / Q000379:methods / Q000662:veterinary; D004032:Diet / Q000662:veterinary*; D004044:Dietary Proteins / Q000032:analysis; D004063:Digestion / Q000502:physiology*; D004285:Dogs / Q000378:metabolism / Q000502:physiology*; D004435:Eating / Q000502:physiology; D005260:Female; D007082:Ileum / Q000378:metabolism / Q000502:physiology; D008461:Meat Products / Q000032:analysis*; D008903:Minerals / Q000032:analysis*; D011202:Poultry Products / Q000032:analysis*
D000596:Amino Acids; D001688:Biological Products; D004044:Dietary Proteins; D008903:Minerals; C027762:bone meal