The proximate analysis, amino acid content and true amino acid digestibility and TMEn for poultry of adult Field
crickets Gryllus testaceus Walker, were investigated. The insect was also used as partial replacement of protein supplements in the
broiler diet on an equal CP percentage and TMEn basis. The results indicated that the adult insect contained: crude protein 58.3%; fat
10.3%, chitin 8.7% and ash 2.96% on dry matter basis, respectively. The total amounts of methionine, cystine and lysine in the Field
crickets were 1.93%, 1.01% and 4.79%, respectively, and their true digestibility coefficients, determined in cecectomized roosters, were
94.1%, 85% and 96%, respectively. The TMEn of this insect meal was 2,960 kcal/kg determined in cecectomized roosters. When cornsoybean meal diets were formulated on an equal CP percentage and TMEn basis, up to 15% Field cricket could replace control diet
without any adverse affects on broiler weight gain, feed intake or gain:feed ratio from 8 to 20 d posthatching.