Essential oils in the initial phase of broodstock diets of Nile tilapia

This study evaluated the effect of feed supplementation (at doses of 0, 50, 100, 150, and 200 mg/kg) with SALUTO®, a microencapsulated blend of essential oils including carvacrol, cinnamaldehyde, 1,8-cineol, and pepper oleoresin, in Nile tilapia (Oreochromis niloticus) broodstock on reproductive and growth parameters during the initial phase of rearing. The growth parameters, somatic indexes and gonadal and hepatic parameters were analyzed. Quantitative parameters of growth, ovary fat and crude protein were not affected by supplementation of the additive. However, an increase in crude protein in the female liver was observed in correlation with increased essential oil levels. The female hepatosomatic index was also correlated with supplementation of essential oils. Feeding Nile tilapia broodstock diets containing an essential oil compound (SALUTO®) affects only the females, promoting an increase in liver protein inclusion and hepatosomatic index without impairing performance

Efeitos da peletização e extrusão sobre a digestibilidade de ingredientes alternativos do Semi-árido Nordestino para a tilápia do Nilo

The apparent digestibility of nutrients and energy from cassava (RM), goats / sheep by products meal (FR) and maniçoba hay meal (FM) was evaluated for Nile tilapia in feed processing, as palletized and extruded form. The apparent digestibility of crude protein and energy for the RM, FR and FM in pelletized diets were respectively 77.97 and 65.86%, 93.79 and 88.62%, 54.62 and 28.64%. The apparent digestibility of crude protein and energy for the RM, FR and FM in extruded feeds were respectively 83.98 and 81.77%, 62.55 and 89.81%, 52.73 and 28.09%. The extrusion contributed to the improvement of energy digestibility of the RM, but reduced the apparent digestibility of the protein fraction of FR. The values of digestible nutrients in the present work, regardless of the processing, suggest a good potential for the use of cassava flour and goats/sheep by products meal in the composition of diets for Nile tilapia, unlike hay maniçoba hay meal.Foi avaliada a digestibilidade aparente dos nutrientes e energia da raspa de mandioca (RM), a farinha de resíduo de abate de caprinos/ovinos (FR) e a farinha de feno de maniçoba (FM), para a tilápia do Nilo em rações processadas na forma peletizada e na forma extrusada. Os coeficientes de digestibilidade aparente da proteína e energia brutas para a RM, o FR e a FM em rações peletizadas foram respectivamente 77,97 e 65,86%, 93,79 e 88,62%, 54,62 e 28,64%. Os coeficientes de digestibilidade aparente da proteína e energia brutas para a RM, o FR e a FM em rações extrusadas foram respectivamente 83,98 e 81,77%, 62,55 e 89,81%, 52,73 e 28,09%. A extrusão contribuiu para a melhora da digestibilidade aparente da energia da RM, porém diminuiu a digestibilidade aparente da fração protéica da FR. Os valores de nutrientes digestíveis determinados no presente trabalho, independente do processamento, apontam para um bom potencial para a utilização da raspa de mandioca e a farinha de resíduos de abate de caprinos/ovinos na composição de rações para a tilápia do Nilo, ao contrário do feno de maniçoba moído