With the global rise in companion animal ownership, there is an emerging market for high-quality, sustainable, and nutritious pet treats. This study explores the potential of microalgae-supplemented products, using biomass from A. platensis, C. vulgaris., and Schizochytrium limacinum. Biomass was evaluated for their bioactivity and nutritional properties. Dog and cat cookies were supplemented with microalgae, and evaluated for nutritional, palatability and public interest. Our findings indicate significant amounts of bioactive compounds in the algae, including phenols and flavonoids. C. vulgaris methanol extract displayed strong ferric reducing antioxidant power (FRAP) with an EC50 value of 0.725 mg/ml. A. platensis. had high ABTS radical scavenging activity with an EC50 value of 0.409 mg/ml. S. limacinum demonstrated notable AChE inhibition with an IC50 of 1.18 mg/ml, while A. platensis., had a BuChE inhibition (IC50 = 3.321 mg/ml). Nutritional analyses revealed high contents of protein, lipids, and carbohydrates, essential for overall pet health. Cookies supplemented with a mixture of the three microalgae showed a higher protein concentration (3.719g/100g DW) compared to those supplemented with a single type of microalgae and the control. Additionally, palatability tests and a public interest survey were conducted to gauge acceptance of microalgae-supplemented cookies
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