The correlation between serum lipid concentrations of 6 groups native-born cats or their crosses (females young vs. young males, adult females vs. adult males, young females vs. adult females, young males vs. adult males, females vs. males and young vs. adults) are compared and analyzed. Blood samples on an empty stomach from 96 cats differentiated by gender and age (48 cats under two years: 19 females and 29 males and 48 cats over two years: 18 females and 30 males) were obtained. Tthe levels of triglycerides (TG), total cholesterol (CT), and high density lipoprotein cholesterol (HDLC) were measured using the enzymatic-colorimetric method; very * Fr: 7-IV-2012. FA: 27-VII-2012. 1 Laboratorio de Bioquimica Clinica y Patologia Molecular, departamento de Ciencias Basicas de la salud, universidad de Caldas, Manizales, Colombia. email: jose.osorio_o@ucaldas.edu.co. 2 Facultad de Ciencias Agropecuarias, universidad de Caldas, Manizales, Colombia. 3 Laboratorio de Microbiologia, departamento de Ciencias Basicas de la salud, universidad de Caldas, Manizales, Colombia. ISSN 0123 3068 bol.cient.mus.hist.nat. 16 (1): 175 182