Ractopamine supplementation in diets for Nile tilapia (Oreochromis niloticus) at grow-out phase: effect on body composition and fatty acid profile

• Trombeta, Thiago Dias ^[1] ; Uribe Tapia, Eduardo ^[2] ; Olivetti de Mattos, Bruno ^[3] ; Pereira, Raquel Tatiane ^[4] ; Dallago, Bruno ^[1] ; Leal, Renato Silva ^[4] ; Crovatto Veras, Galileu ^[5] ; Wacyk, Jurij ^[6]
  1. [1] Universidade de Brasília

     Universidade de Brasília

     Brasil

     
  2. [2] Universidad Católica del Norte

     Universidad Católica del Norte

     Antofagasta, Chile

     
  3. [3] Universidade Federal do Recôncavo da Bahia

     Universidade Federal do Recôncavo da Bahia

     Brasil

     
  4. [4] Universidade Federal de Lavras

     Universidade Federal de Lavras

     Brasil

     
  5. [5] Universidade Federal de Minas Gerais

     Universidade Federal de Minas Gerais

     Brasil

     
  6. [6] Universidad de Chile

     Universidad de Chile

     Santiago, Chile

     

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• Localización: Latin American Journal of Aquatic Research, ISSN-e 0718-560X, ISSN 0716-1069, Vol. 51, Nº. 2, 2023, págs. 210-217
• Idioma: inglés
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• Resumen

  • Ractopamine is a drug used as an additive in animal production to improve growth, body composition, and production efficiency, although its use in fish is still poorly known. This study aimed to evaluate ractopamine hydrochloride (RAC) effects at increasing levels (0, 10, 20, and 40 mg kg-1) in Nile tilapia (Oreochromis niloticus) diets during 40 days by considering growth performance, body composition, and muscle fiber morphometry. One hundred and twelve fish (mean initial weight 518.63 ± 5.49 g) were housed in 16 circular tanks (450 L), following a completed randomized design with four treatments and four replicates. Body composition was significantly affected (P < 0.05), and the content of lipids in fish fillets dropped 26.7% (20 mg kg-1 RAC) and 26.1% (40 mg kg-1 RAC), as well as the amount of unsaturated fatty acids C14:0 and C18:0 in fish fillets (P < 0.05) by treatment with 10 mg kg-1 of RAC. Results demonstrate that fish fed 20 mg kg-1 RAC for 40 days changed Nile tilapia fillet chemical composition, decreasing lipid levels, altering the fatty acid profile, and increasing protein levels. RAC did not affect any productive performance parameters evaluated for muscle fiber morphometry.