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Tropentag, September 14 - 16, 2022, Prague

"Can agroecological farming feed the world? Farmers' and academia's views."

Inclusion of cinereous cockroach flour in the feed of bullfrogs

Marcos Pereira Silveira1, Andressa Santana Natel2, Ariane Flávia Nascimento3, Diego Vicente da Costa4, Galileu Crovatto Veras5, Mariana Elisabete de Oliveira Ferreira6

1University José Do Rosário Vellano (UNIFENAS), Production System in Agriculture, Brazil
2University José do Rosário Vellano (UNIFENAS), Dept. of Agronomy, Brazil
3Federal Institute of Minas Gerais, Animal Science Department, Brazil
4Universidade Federal e Minas Gerais, Inst. of Agricultural Sciences, Brazil
5Universidade Federal e Minas Gerais, Veterinary Medicine and Animal Science, Brazil
6UNIS, Veterinary Medicine, Brazil


The bullfrog (Lithobates catesbeianus) is carnivorous in the post-metamorphic phase and needs food with high protein content, so a commercial fish food for carnivorous fish is used with high protein level (40-45%), and it can be mixed or not with housefly larvae. Numerous species of insects are being tested for animal feed, including the cinereous cockroach (Nauphoeta cinerea), which has an average protein content of 62.2% and a lipid content of 27.6%. So, this work aims to evaluate the effect of the inclusion of cinereous cockroach flour in bullfrogs diet on performance. For this, 32 bullfrogs were housed in 4 concrete semi-flooded pens - Anfigranja production system (1.75 m × 1.72 m). The average water temperature was of the 25.5 ± 3.4 °C during the experimental period. The bullfrogs were acclimated for six days were weighed on an electronic scale (initial weight of 124.1 ± 48.12 g) and distributed in a completely randomised design in three treatments, with eight repetitions. The treatments consisted of the addition of Cinereous Cockroach Flour (CCF-UFMG- Brazil) in the proportion of 0, 25 and 50% in the commercial food. The bullfrogs were fed twice a day (ad libitum) for 36 days. Food consumption was calculated by the difference between the food offered and the leftovers. At the end of the experimental period was evaluated the frogs daily feed intake; weight gain (WG); specific growth rate (SGR) and feed conversion (FC). The addition of CCF to the bullfrog diet did not affect (P > 0.05) the productive performance variables initial weight, final weight, WG and SGR. However, the average feed intake in the period (grams for day), linearly reduced (y= 186.4583 – 0.8800, R2= 0.995, P < 0.01) with the addition of CCF. Linear reduction trend (P = 0.06) was observed for WG (51.2, 65.5 and 81.4 g) and SGR (1.8, 2.3 and 2.8 g.day-1) with the addition of CCF at 0%, 25% and 50%. The inclusion of cinereous cockroach flour, in these experimental conditions, allowed the reduction of feed consumption without affecting the performance parameters.

Keywords: Biochemical profile, insect proteins, Lithobates catesbeianus, sustainably

Contact Address: Andressa Santana Natel, University José do Rosário Vellano (UNIFENAS), Dept. of Agronomy, Alfenas, Brazil, e-mail: andressa.natel@unifenas.br

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