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This study aimed to evaluate the inflammatory response, oxidative status, and fatty acid deposition in reproductive tissues of cats supplemented with the dried microalgae Schizochytrium spp. (Thraustochytriaceae) as docosahexaenoic acid (DHA) source. Thirty-seven cats (males, n= 21; females, n= 16; 11.5±0.5 months of age) were divided by sex into five groups. Treatment diets contained algae biomass at 4.0, 8.0, 12.0, or 16.0 g/kg replacing poultry fat (omega-6 source). Cats were fed the respective diet for 62 d and neutered on day 58. Blood samples were collected at the beginning of the experiment (day 1), before neutering (day 58), and four days after surgery (day 62) for analysis of inflammation and oxidative markers. Acute-phase protein levels were altered (P < 0•01) in the postoperative period, without any treatment effect (P > 0•05). Prostaglandin E2 (PGE2) concentrations after surgery was reduced linearly (R2 = 0.8706; P = 0•002) with microalgal inclusion. Blood platelet count was reduced (P = 0•001) after the surgery regardless treatment but, it was higher in the DHA group compared to Control (P < 0•001). The DHA deposition (testicles, R2 = 0.846; ovaries, R2 = 0.869), and the omega-6/omega-3 ratio (testicles, R2 = 0.859; ovaries, R2 = 0.955) in gonads had a pattern which fitted a quadratic model. DHA from Schizochytrium spp. modifies PGE2 response after the surgery in cats. The physiological roles of the DHA in the reproduction of cats were not investigated, but its gonadal deposition after supplementation was observed.

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