Insect meals are novel and potentially sustainable protein sources. The objective of this study was to determine the chemical composition and standardized amino acid digestibility using the cecectomized rooster model of 3 selected insect meals [i.e., speckled cockroach (SC), Madagascar hissing cockroach (MC) and superworm (SW)], and to determine the effects of these insect meals on food intake, apparent total tract digestibility (ATTD) of macronutrients, fecal scores and metabolites of adult cats fed insect- or chicken-based retorted diets. This study consisted of a complete randomized design, with 28 adult cats randomly assigned to 1 of 4 experimental retorted diets: Control (chicken-base diet), SC diet, MC diet, or SW diet. All animal procedures were approved by the University of Illinois Institutional Animal Care and Use Committee. All diets were formulated to be complete and balanced and meet or exceed the nutritional requirements of adult cats. The experimental period was 28 d, with the first 7 d allotted for diet adaptation. Total fecal collection was completed during the last 4 d of the experimental period. On d 21, a fresh fecal sample from each cat was collected for determination of fecal metabolites and microbiota. Food was offered twice daily to maintain body weight and body condition score. Among the 3 selected insect meals evaluated, oleic acid, palmitic acid, linoleic acid, and stearic acid were the most prevalent fatty acids. Branched-chain amino acids and arginine were the most preponderant indispensable amino acids in these insect meals. Apparent total tract digestibility of dry matter (DM), organic matter (OM), acid hydrolyzed fat (AHF), and crude protein (CP) did not differ among treatments (P > 0.05) and all diets were well digested by the cats. Similarly, fecal scores did not differ among the treatments and were within ideal range. No differences (P > 0.05) in fecal metabolite concentrations or microbiota diversity were observed among cats fed different experimental diets; only a few genera from Firmicutes and Bacteroidota phyla differ (P < 0.05) in cats fed SW diet in contrast with other dietary treatments. In conclusion, the selected insect meals evaluated herein are rich in linoleic acid, an essential fatty acid for cats. Insect-based retorted diets led to comparable results to a chicken-based retorted diet; suggesting that these novel protein sources might be adequate alternative ingredients in feline diets.
As the human and pet populations increase, the human and pet food industries will experience a greater demand for animal-based protein sources. Finding alternative proteins that are nutritional adequate and safe for companion animals may contribute to diversification of protein sources and lower the demand for animal-based protein in pet food products. However, limited information is available on the nutritional value of insects for pet animals. Thus, the object of this study was to evaluate three different insect meals, Speckled cockroach (SC; Nauphoeta cinerea), Madagascar hissing cockroach (MC; Gromphadorhina portentosa) and superworm (SW; Zophobas morio larvae), added at the expense of chicken meal (control diet), as protein sources in retorted feline diets. This study was a complete randomized design, with a total of 28 cats (mean age = 2.1 ± 0.03 yr; mean BW= 4.9 ± 0.8 kg) randomly assigned to 1 of the 4 dietary treatments. All animal procedures were approved by the University of Illinois Institutional Animal Care and Use Committee. All diet formulated meet or exceed the AAFCO (2018) nutrient profile. The experimental period was 28 d in length, with 7 d of diet adaptation (control diet) followed by 21 of feeding the assigned experimental diets. Fecal samples were collected at the last 4 d of experiment. All diets were well digested by the cats, and apparent total tract digestibility of dry matter (86.5–88.1%), organic matter (88.9–90.6%), fat (90.1–92.3%), crude protein (86.3–89.4%) did not differ among treatments (P > 0.05). Fecal scores were not affected by dietary treatment, ranging from 1.8 to 2.2 (5–point scale). Similarly, fecal branched-chain fatty acids, indole and phenol concentrations did not differ among treatments. Overall, the selected insect meals tested herein had no negative effects on macronutrient digestibility, fecal characteristics and metabolites, or overall health of adult cats.
Green banana flour (GBF) has gained popularity for its health-promoting properties, since it is nutrient-rich, gluten-free, low in free sugars, and high in fiber, particularly resistant starch type 2 and pectin. Resistant starch helps promote gut health, and pectin could act as a natural thickening agent for manufacturing. Also, GBF may contribute a natural brown color to finished products. The objective of this pilot study was to determine the chemical composition of four commercially available GBFs and the effects of inclusion of these ingredients on texture, color and water binding characteristics in wet pet food products. Four types of GBF were analyzed to determine their nutritional composition. Canned foods containing four sources of green banana flour in different amounts were tested for their effects on texture and/or color of the products. For the chemical composition, all four GBF had high resistant starch concentration, ranging from 28.4% to 40.9%, and low free sugar concentration (1.8% to 7.5%). Crude protein and acid hydrolyzed fat concentrations were below 6% and 4% for all GBF tested, respectively. Texture analyses showed that hardness, adhesiveness, springiness, resilience, and firmness/toughness of canned foods containing GBF were similar to at least one of the commercial diets tested (P >0.05). Using CIE L*a*b* for color parameter, lightness was variable among commercial diets (L* ranged from 24.55 to 36.75) and canned food containing GBF (35.60 to 63.41) (P < 0.05). Redness and yellowness of experimental diets were similar to those of commercial food (P >0.05), with a* ranging from 4.67 to 11.29 and b* from 13.58 to 24.26. Overall, GBF has potential to be a functional ingredient for pet food due to its high resistant starch and low free sugar content, and the resulting product is similar in texture and color to commercial wet pet foods.
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