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Insect larva meal (Tenebrio molitor) in broiler chickens\' diet: feed preference, metabolizable energy and digestibility of amino acids

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Marcos Antonio Nascimento Filho
Total Authors: 1
Document type: Master's Dissertation
Press: Piracicaba.
Institution: Universidade de São Paulo (USP). Escola Superior de Agricultura Luiz de Queiroz (ESALA/BC)
Defense date:
Examining board members:
José Fernando Machado Menten; Thiago de Araújo Mastrangelo; Andre Viana Coelho de Souza
Advisor: José Fernando Machado Menten

The use of insects in the animal industry is a promising alternative because it combines high nutritional value and nutraceutical proprieties in a sustainable production system from an economic and environmental point of view. Considering that free-range birds have a natural behavior to pick up a variety of insects during their entire lifecycle and eat them voluntarily, the introduction of ingredients, such as Tenebrio molitor larva meal, in the formulation of diets can contribute to optimize this production chain. Therefore, in order to characterize the nutritional composition and provide a scientific framework to rise the discussion on the use of insects for animals in Brazil, this research project investigated the effects of tenebrio meal in broiler chickens diet. This research was divided in two approaches of using insect meal for chickens: a) ingredient preference and feed intake (experiment 1); and b) metabolizable energy and amino acid digestibility assays (experiments 2 and 3). The feeding behavior among tenebrio meal, ground corn, extruded semi-whole soybean meal, and supplement mixture (minerals, vitamins, amino acids) was investigated to verify the interest by the chickens for insect meal and guide the amount of tenebrio meal inclusion in poultry diets. Following, the nutritional composition, metabolizable energy and standardized ileal digestibility of amino acids of tenebrio meal were quantified. In experiment 1, broiler chickens showed high acceptability for tenebrio larva meal, consuming on average 50% of the total intake during the experimental period. There was a gradual increase in the consumption of tenebrio meal, which stabilized from day 11 of the experimental period. In the stabilization period, tenebrio meal was the most preffered ingredient by the chickens, in which also generated an improvement in feed conversion of the birds. In experiments 2 and 3, the nutritional composition of tenebrio meal indicates that this alternative ingredient is a rich source of crude protein (500.0 g/kg), ether extract (297.3 g/kg), and crude energy (6,336 kcal/kg), as fed basis. Determined apparent metabolizable energy corrected for nitrogen balance was 5,004 ± 121 kcal/kg in dry matter basis, and the standardized ileal amino acid digestibility coefficients were: Met, 0.87; Lys, 0.89; Thr, 0.82; Val, 0.86; Ile, 0.86; Arg, 0.92; Phe, 0.90; Leu, 0.88; His, 0.81. The results of this project indicate the nutritional and/or nutraceutical potential of the Tenebrio molitor larva meal to be exploited, being a guide for adequate formulation of diets when this novel ingredient is incorporated into poultry feeding. (AU)

FAPESP's process: 17/19751-7 - Tenébrio (Tenebrio molitor) in broiler diets: metabolizable energy, amino acids digestibility and performance
Grantee:Marcos Antonio Nascimento Filho
Support Opportunities: Scholarships in Brazil - Master